use smallvec and add comment about memory usage

.dockerignore

@@ -1,28 +1,27 @@
 *
 
-# Files
-!Cargo.lock
-!Cargo.toml
-!Makefile
 !rust-toolchain.toml
-!scripts/combine_control_files.py
-!scripts/ninstall.sh
-!vm-cgconfig.conf
+!Cargo.toml
+!Cargo.lock
+!Makefile
 
-# Directories
 !.cargo/
 !.config/
-!compute_tools/
 !control_plane/
+!compute_tools/
 !libs/
-!neon_local/
 !pageserver/
-!patches/
 !pgxn/
 !proxy/
-!s3_scrubber/
 !safekeeper/
+!s3_scrubber/
 !storage_broker/
 !trace/
-!vendor/postgres-*/
+!vendor/postgres-v14/
+!vendor/postgres-v15/
+!vendor/postgres-v16/
 !workspace_hack/
+!neon_local/
+!scripts/ninstall.sh
+!scripts/combine_control_files.py
+!vm-cgconfig.conf

.github/actions/allure-report-generate/action.yml

@@ -179,6 +179,23 @@ runs:
           aws s3 rm "s3://${BUCKET}/${LOCK_FILE}"
         fi
 
+    - name: Store Allure test stat in the DB
+      if: ${{ !cancelled() && inputs.store-test-results-into-db == 'true' }}
+      shell: bash -euxo pipefail {0}
+      env:
+        COMMIT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
+        REPORT_JSON_URL: ${{ steps.generate-report.outputs.report-json-url }}
+      run: |
+        export DATABASE_URL=${REGRESS_TEST_RESULT_CONNSTR}
+
+        ./scripts/pysync
+
+        poetry run python3 scripts/ingest_regress_test_result.py \
+          --revision ${COMMIT_SHA} \
+          --reference ${GITHUB_REF} \
+          --build-type unified \
+          --ingest ${WORKDIR}/report/data/suites.json
+
     - name: Store Allure test stat in the DB (new)
       if: ${{ !cancelled() && inputs.store-test-results-into-db == 'true' }}
       shell: bash -euxo pipefail {0}

.github/workflows/build_and_push_docker_image.yml

@@ -69,15 +69,7 @@ jobs:
         run: echo "{\"credsStore\":\"ecr-login\"}" > /kaniko/.docker/config.json
 
       - name: Kaniko build
-        run: |
-          /kaniko/executor \
-            --reproducible \
-            --snapshotMode=redo \
-            --skip-unused-stages \
-            --dockerfile ${{ inputs.dockerfile-path }} \
-            --cache=true \
-            --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache \
-            --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-amd64
+        run: /kaniko/executor --reproducible --snapshotMode=redo --skip-unused-stages --dockerfile ${{ inputs.dockerfile-path }} --cache=true --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache  --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-amd64
 
   kaniko-arm:
     if: needs.check-if-build-tools-dockerfile-changed.outputs.docker_file_changed == 'true'
@@ -93,15 +85,7 @@ jobs:
         run: echo "{\"credsStore\":\"ecr-login\"}" > /kaniko/.docker/config.json
 
       - name: Kaniko build
-        run: |
-          /kaniko/executor \
-            --reproducible \
-            --snapshotMode=redo \
-            --skip-unused-stages \
-            --dockerfile ${{ inputs.dockerfile-path }} \
-            --cache=true \
-            --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache \
-            --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-arm64
+        run: /kaniko/executor --reproducible --snapshotMode=redo --skip-unused-stages --dockerfile ${{ inputs.dockerfile-path }} --cache=true --cache-repo 369495373322.dkr.ecr.eu-central-1.amazonaws.com/cache --destination 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-arm64
 
   manifest:
     if: needs.check-if-build-tools-dockerfile-changed.outputs.docker_file_changed == 'true'
@@ -115,10 +99,7 @@ jobs:
 
     steps:
       - name: Create manifest
-        run: |
-          docker manifest create 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }} \
-                         --amend 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-amd64 \
-                         --amend 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-arm64
+        run: docker manifest create 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }} --amend 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-amd64 --amend 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}-arm64
 
       - name: Push manifest
         run: docker manifest push 369495373322.dkr.ecr.eu-central-1.amazonaws.com/${{ inputs.image-name }}:${{ needs.tag.outputs.build-tools-tag }}

.github/workflows/build_and_test.yml

@@ -21,8 +21,6 @@ env:
   COPT: '-Werror'
   AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_DEV }}
   AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_KEY_DEV }}
-  # A concurrency group that we use for e2e-tests runs, matches `concurrency.group` above with `github.repository` as a prefix
-  E2E_CONCURRENCY_GROUP: ${{ github.repository }}-${{ github.workflow }}-${{ github.ref_name }}-${{ github.ref_name == 'main' && github.sha || 'anysha' }}
 
 jobs:
   check-permissions:
@@ -46,20 +44,6 @@ jobs:
 
         exit 1
 
-  cancel-previous-e2e-tests:
-    needs: [ check-permissions ]
-    if: github.event_name == 'pull_request'
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Cancel previous e2e-tests runs for this PR
-        env:
-          GH_TOKEN: ${{ secrets.CI_ACCESS_TOKEN }}
-        run: |
-          gh workflow --repo neondatabase/cloud \
-            run cancel-previous-in-concurrency-group.yml \
-              --field concurrency_group="${{ env.E2E_CONCURRENCY_GROUP }}"
-
   tag:
     needs: [ check-permissions ]
     runs-on: [ self-hosted, gen3, small ]
@@ -202,11 +186,7 @@ jobs:
     runs-on: [ self-hosted, gen3, large ]
     container:
       image: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/build-tools:${{ needs.build-buildtools-image.outputs.build-tools-tag }}
-      # Raise locked memory limit for tokio-epoll-uring.
-      # On 5.10 LTS kernels < 5.10.162 (and generally mainline kernels < 5.12),
-      # io_uring will account the memory of the CQ and SQ as locked.
-      # More details: https://github.com/neondatabase/neon/issues/6373#issuecomment-1905814391
-      options: --init --shm-size=512mb --ulimit memlock=67108864:67108864
+      options: --init
     strategy:
       fail-fast: false
       matrix:
@@ -360,12 +340,8 @@ jobs:
           ${cov_prefix} mold -run cargo build $CARGO_FLAGS $CARGO_FEATURES --bins --tests
 
       - name: Run rust tests
-        env:
-          NEXTEST_RETRIES: 3
         run: |
-          for io_engine in std-fs tokio-epoll-uring ; do
-            NEON_PAGESERVER_UNIT_TEST_VIRTUAL_FILE_IOENGINE=$io_engine ${cov_prefix} cargo nextest run $CARGO_FLAGS $CARGO_FEATURES
-          done
+          ${cov_prefix} cargo nextest run $CARGO_FLAGS $CARGO_FEATURES
 
           # Run separate tests for real S3
           export ENABLE_REAL_S3_REMOTE_STORAGE=nonempty
@@ -443,8 +419,8 @@ jobs:
     runs-on: [ self-hosted, gen3, large ]
     container:
       image: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/build-tools:${{ needs.build-buildtools-image.outputs.build-tools-tag }}
-      # for changed limits, see comments on `options:` earlier in this file
-      options: --init --shm-size=512mb --ulimit memlock=67108864:67108864
+      # Default shared memory is 64mb
+      options: --init --shm-size=512mb
     strategy:
       fail-fast: false
       matrix:
@@ -472,7 +448,6 @@ jobs:
           TEST_RESULT_CONNSTR: ${{ secrets.REGRESS_TEST_RESULT_CONNSTR_NEW }}
           CHECK_ONDISK_DATA_COMPATIBILITY: nonempty
           BUILD_TAG: ${{ needs.tag.outputs.build-tag }}
-          PAGESERVER_VIRTUAL_FILE_IO_ENGINE: std-fs
 
       - name: Merge and upload coverage data
         if: matrix.build_type == 'debug' && matrix.pg_version == 'v14'
@@ -483,13 +458,12 @@ jobs:
     runs-on: [ self-hosted, gen3, small ]
     container:
       image: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/build-tools:${{ needs.build-buildtools-image.outputs.build-tools-tag }}
-      # for changed limits, see comments on `options:` earlier in this file
-      options: --init --shm-size=512mb --ulimit memlock=67108864:67108864
+      # Default shared memory is 64mb
+      options: --init --shm-size=512mb
     if: github.ref_name == 'main' || contains(github.event.pull_request.labels.*.name, 'run-benchmarks')
     strategy:
       fail-fast: false
       matrix:
-        # the amount of groups (N) should be reflected in `extra_params: --splits N ...`
         pytest_split_group: [ 1, 2, 3, 4 ]
         build_type: [ release ]
     steps:
@@ -503,12 +477,11 @@ jobs:
           test_selection: performance
           run_in_parallel: false
           save_perf_report: ${{ github.ref_name == 'main' }}
-          extra_params: --splits 4 --group ${{ matrix.pytest_split_group }}
+          extra_params: --splits ${{ strategy.job-total }} --group ${{ matrix.pytest_split_group }}
         env:
           VIP_VAP_ACCESS_TOKEN: "${{ secrets.VIP_VAP_ACCESS_TOKEN }}"
           PERF_TEST_RESULT_CONNSTR: "${{ secrets.PERF_TEST_RESULT_CONNSTR }}"
           TEST_RESULT_CONNSTR: "${{ secrets.REGRESS_TEST_RESULT_CONNSTR_NEW }}"
-          PAGESERVER_VIRTUAL_FILE_IO_ENGINE: std-fs
       # XXX: no coverage data handling here, since benchmarks are run on release builds,
       # while coverage is currently collected for the debug ones
 
@@ -531,6 +504,7 @@ jobs:
         with:
           store-test-results-into-db: true
         env:
+          REGRESS_TEST_RESULT_CONNSTR: ${{ secrets.REGRESS_TEST_RESULT_CONNSTR }}
           REGRESS_TEST_RESULT_CONNSTR_NEW: ${{ secrets.REGRESS_TEST_RESULT_CONNSTR_NEW }}
 
       - uses: actions/github-script@v6
@@ -608,6 +582,17 @@ jobs:
             --input-objects=/tmp/coverage/binaries.list \
             --format=lcov
 
+      - name: Upload coverage report
+        id: upload-coverage-report
+        env:
+          BUCKET: neon-github-public-dev
+          COMMIT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
+        run: |
+          aws s3 cp --only-show-errors --recursive /tmp/coverage/report s3://${BUCKET}/code-coverage/${COMMIT_SHA}
+
+          REPORT_URL=https://${BUCKET}.s3.amazonaws.com/code-coverage/${COMMIT_SHA}/index.html
+          echo "report-url=${REPORT_URL}" >> $GITHUB_OUTPUT
+
       - name: Build coverage report NEW
         id: upload-coverage-report-new
         env:
@@ -644,11 +629,21 @@ jobs:
 
       - uses: actions/github-script@v6
         env:
+          REPORT_URL: ${{ steps.upload-coverage-report.outputs.report-url }}
           REPORT_URL_NEW: ${{ steps.upload-coverage-report-new.outputs.report-url }}
           COMMIT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
         with:
           script: |
-            const { REPORT_URL_NEW, COMMIT_SHA } = process.env
+            const { REPORT_URL, REPORT_URL_NEW, COMMIT_SHA } = process.env
+
+            await github.rest.repos.createCommitStatus({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              sha: `${COMMIT_SHA}`,
+              state: 'success',
+              target_url: `${REPORT_URL}`,
+              context: 'Code coverage report',
+            })
 
             await github.rest.repos.createCommitStatus({
               owner: context.repo.owner,
@@ -700,8 +695,7 @@ jobs:
                 \"commit_hash\": \"$COMMIT_SHA\",
                 \"remote_repo\": \"${{ github.repository }}\",
                 \"storage_image_tag\": \"${{ needs.tag.outputs.build-tag }}\",
-                \"compute_image_tag\": \"${{ needs.tag.outputs.build-tag }}\",
-                \"concurrency_group\": \"${{ env.E2E_CONCURRENCY_GROUP }}\"
+                \"compute_image_tag\": \"${{ needs.tag.outputs.build-tag }}\"
               }
             }"
 

.github/workflows/neon_extra_builds.yml

@@ -124,12 +124,12 @@ jobs:
       # Hence keeping target/ (and general cache size) smaller
       BUILD_TYPE: release
       CARGO_FEATURES: --features testing
-      CARGO_FLAGS: --release
+      CARGO_FLAGS: --locked --release
       AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_DEV }}
       AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_KEY_DEV }}
 
     container:
-      image: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/build-tools:pinned
+      image: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/rust:pinned
       options: --init
 
     steps:
@@ -210,20 +210,18 @@ jobs:
 
       - name: Run cargo build
         run: |
-          mold -run cargo build --locked $CARGO_FLAGS $CARGO_FEATURES --bins --tests
+          mold -run cargo build $CARGO_FLAGS $CARGO_FEATURES --bins --tests
 
       - name: Run cargo test
-        env:
-          NEXTEST_RETRIES: 3
         run: |
-          cargo nextest run $CARGO_FEATURES
+          cargo test $CARGO_FLAGS $CARGO_FEATURES
 
           # Run separate tests for real S3
           export ENABLE_REAL_S3_REMOTE_STORAGE=nonempty
           export REMOTE_STORAGE_S3_BUCKET=neon-github-ci-tests
           export REMOTE_STORAGE_S3_REGION=eu-central-1
           # Avoid `$CARGO_FEATURES` since there's no `testing` feature in the e2e tests now
-          cargo nextest run --package remote_storage --test test_real_s3
+          cargo test $CARGO_FLAGS --package remote_storage --test test_real_s3
 
           # Run separate tests for real Azure Blob Storage
           # XXX: replace region with `eu-central-1`-like region
@@ -233,7 +231,7 @@ jobs:
           export REMOTE_STORAGE_AZURE_CONTAINER="${{ vars.REMOTE_STORAGE_AZURE_CONTAINER }}"
           export REMOTE_STORAGE_AZURE_REGION="${{ vars.REMOTE_STORAGE_AZURE_REGION }}"
           # Avoid `$CARGO_FEATURES` since there's no `testing` feature in the e2e tests now
-          cargo nextest run --package remote_storage --test test_real_azure
+          cargo test $CARGO_FLAGS --package remote_storage --test test_real_azure
 
   check-codestyle-rust-arm:
     timeout-minutes: 90

.github/workflows/update_build_tools_image.yml

@@ -20,51 +20,111 @@ defaults:
   run:
     shell: bash -euo pipefail {0}
 
+env:
+  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_DEV }}
+  AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_KEY_DEV }}
+
 permissions: {}
 
 jobs:
   tag-image:
     runs-on: [ self-hosted, gen3, small ]
+    container: golang:1.19-bullseye
 
     env:
-      ECR_IMAGE: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/build-tools
-      DOCKER_HUB_IMAGE: docker.io/neondatabase/build-tools
+      IMAGE: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/build-tools
+      FROM_TAG: ${{ inputs.from-tag }}
+      TO_TAG: ${{ inputs.to-tag }}
+    outputs:
+      next-digest-buildtools: ${{ steps.next-digest.outputs.next-digest-buildtools }}
+      prev-digest-buildtools: ${{ steps.prev-digest.outputs.prev-digest-buildtools }}
+
+    steps:
+      - name: Install Crane & ECR helper
+        run: |
+          go install github.com/google/go-containerregistry/cmd/crane@a54d64203cffcbf94146e04069aae4a97f228ee2 # v0.16.1
+          go install github.com/awslabs/amazon-ecr-credential-helper/ecr-login/cli/docker-credential-ecr-login@adf1bafd791ae7d4ff098108b1e91f36a4da5404 # v0.7.1
+
+      - name: Configure ECR login
+        run: |
+          mkdir /github/home/.docker/
+          echo "{\"credsStore\":\"ecr-login\"}" > /github/home/.docker/config.json
+
+      - name: Get source image digest
+        id: next-digest
+        run: |
+          NEXT_DIGEST=$(crane digest ${IMAGE}:${FROM_TAG} || true)
+          if [ -z "${NEXT_DIGEST}" ]; then
+            echo >&2 "Image ${IMAGE}:${FROM_TAG} does not exist"
+            exit 1
+          fi
+
+          echo "Current ${IMAGE}@${FROM_TAG} image is ${IMAGE}@${NEXT_DIGEST}"
+          echo "next-digest-buildtools=$NEXT_DIGEST" >> $GITHUB_OUTPUT
+
+      - name: Get destination image digest (if already exists)
+        id: prev-digest
+        run: |
+          PREV_DIGEST=$(crane digest ${IMAGE}:${TO_TAG} || true)
+          if [ -z "${PREV_DIGEST}" ]; then
+            echo >&2 "Image ${IMAGE}:${TO_TAG} does not exist (it's ok)"
+          else
+            echo >&2 "Current ${IMAGE}@${TO_TAG} image is ${IMAGE}@${PREV_DIGEST}"
+
+            echo "prev-digest-buildtools=$PREV_DIGEST" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Tag image
+        run: |
+          crane tag "${IMAGE}:${FROM_TAG}" "${TO_TAG}"
+
+  rollback-tag-image:
+    needs:  tag-image
+    if: ${{ !success() }}
+
+    runs-on: [ self-hosted, gen3, small ]
+    container: golang:1.19-bullseye
+
+    env:
+      IMAGE: 369495373322.dkr.ecr.eu-central-1.amazonaws.com/build-tools
       FROM_TAG: ${{ inputs.from-tag }}
       TO_TAG: ${{ inputs.to-tag }}
 
     steps:
-      # Use custom DOCKER_CONFIG directory to avoid conflicts with default settings
-      # The default value is ~/.docker
-      - name: Set custom docker config directory
+      - name: Install Crane & ECR helper
         run: |
-          mkdir -p .docker-custom
-          echo DOCKER_CONFIG=$(pwd)/.docker-custom >> $GITHUB_ENV
+          go install github.com/google/go-containerregistry/cmd/crane@a54d64203cffcbf94146e04069aae4a97f228ee2 # v0.16.1
+          go install github.com/awslabs/amazon-ecr-credential-helper/ecr-login/cli/docker-credential-ecr-login@adf1bafd791ae7d4ff098108b1e91f36a4da5404 # v0.7.1
 
-      - uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.NEON_DOCKERHUB_USERNAME }}
-          password: ${{ secrets.NEON_DOCKERHUB_PASSWORD }}
-
-      - uses: docker/login-action@v2
-        with:
-          registry: 369495373322.dkr.ecr.eu-central-1.amazonaws.com
-          username: ${{ secrets.AWS_ACCESS_KEY_DEV }}
-          password: ${{ secrets.AWS_SECRET_KEY_DEV }}
-
-      - uses: actions/setup-go@v5
-        with:
-          go-version: '1.21'
-
-      - name: Install crane
+      - name: Configure ECR login
         run: |
-          go install github.com/google/go-containerregistry/cmd/crane@a0658aa1d0cc7a7f1bcc4a3af9155335b6943f40 # v0.18.0
+          mkdir /github/home/.docker/
+          echo "{\"credsStore\":\"ecr-login\"}" > /github/home/.docker/config.json
 
-      - name: Copy images
+      - name: Restore previous tag if needed
         run: |
-          crane copy "${ECR_IMAGE}:${FROM_TAG}" "${ECR_IMAGE}:${TO_TAG}"
-          crane copy "${ECR_IMAGE}:${FROM_TAG}" "${DOCKER_HUB_IMAGE}:${TO_TAG}"
+          NEXT_DIGEST="${{ needs.tag-image.outputs.next-digest-buildtools }}"
+          PREV_DIGEST="${{ needs.tag-image.outputs.prev-digest-buildtools }}"
 
-      - name: Remove custom docker config directory
-        if: always()
-        run: |
-          rm -rf .docker-custom
+          if [ -z "${NEXT_DIGEST}" ]; then
+            echo >&2 "Image ${IMAGE}:${FROM_TAG} does not exist, nothing to rollback"
+            exit 0
+          fi
+
+          if [ -z "${PREV_DIGEST}" ]; then
+            # I guess we should delete the tag here/untag the image, but crane does not support it
+            # - https://github.com/google/go-containerregistry/issues/999
+
+            echo >&2 "Image ${IMAGE}:${TO_TAG} did not exist, but it was created by the job, no need to rollback"
+
+            exit 0
+          fi
+
+          CURRENT_DIGEST=$(crane digest "${IMAGE}:${TO_TAG}")
+          if [ "${CURRENT_DIGEST}" == "${NEXT_DIGEST}" ]; then
+            crane tag "${IMAGE}@${PREV_DIGEST}" "${TO_TAG}"
+
+            echo >&2 "Successfully restored ${TO_TAG} tag from ${IMAGE}@${CURRENT_DIGEST} to ${IMAGE}@${PREV_DIGEST}"
+          else
+            echo >&2 "Image ${IMAGE}:${TO_TAG}@${CURRENT_DIGEST} is not required to be restored"
+          fi

Cargo.lock

@@ -10,9 +10,9 @@ checksum = "8b5ace29ee3216de37c0546865ad08edef58b0f9e76838ed8959a84a990e58c5"
 
 [[package]]
 name = "addr2line"
-version = "0.21.0"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+checksum = "a76fd60b23679b7d19bd066031410fb7e458ccc5e958eb5c325888ce4baedc97"
 dependencies = [
  "gimli",
 ]
@@ -278,13 +278,13 @@ dependencies = [
  "camino",
  "clap",
  "control_plane",
- "diesel",
  "futures",
  "git-version",
  "hyper",
  "metrics",
  "pageserver_api",
  "pageserver_client",
+ "postgres_backend",
  "postgres_connection",
  "serde",
  "serde_json",
@@ -840,15 +840,15 @@ dependencies = [
 
 [[package]]
 name = "backtrace"
-version = "0.3.69"
+version = "0.3.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2089b7e3f35b9dd2d0ed921ead4f6d318c27680d4a5bd167b3ee120edb105837"
+checksum = "233d376d6d185f2a3093e58f283f60f880315b6c60075b01f36b3b85154564ca"
 dependencies = [
  "addr2line",
  "cc",
  "cfg-if",
  "libc",
- "miniz_oxide",
+ "miniz_oxide 0.6.2",
  "object",
  "rustc-demangle",
 ]
@@ -1144,6 +1144,16 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2da6da31387c7e4ef160ffab6d5e7f00c42626fe39aea70a7b0f1773f7dd6c1b"
 
+[[package]]
+name = "close_fds"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bc416f33de9d59e79e57560f450d21ff8393adcf1cdfc3e6d8fb93d5f88a2ed"
+dependencies = [
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "colorchoice"
 version = "1.0.0"
@@ -1205,7 +1215,7 @@ dependencies = [
  "flate2",
  "futures",
  "hyper",
- "nix 0.27.1",
+ "nix 0.26.2",
  "notify",
  "num_cpus",
  "opentelemetry",
@@ -1317,13 +1327,11 @@ dependencies = [
  "clap",
  "comfy-table",
  "compute_api",
- "diesel",
- "diesel_migrations",
  "futures",
  "git-version",
  "hex",
  "hyper",
- "nix 0.27.1",
+ "nix 0.26.2",
  "once_cell",
  "pageserver_api",
  "pageserver_client",
@@ -1333,7 +1341,6 @@ dependencies = [
  "regex",
  "reqwest",
  "safekeeper_api",
- "scopeguard",
  "serde",
  "serde_json",
  "serde_with",
@@ -1629,52 +1636,6 @@ dependencies = [
  "rusticata-macros",
 ]
 
-[[package]]
-name = "diesel"
-version = "2.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62c6fcf842f17f8c78ecf7c81d75c5ce84436b41ee07e03f490fbb5f5a8731d8"
-dependencies = [
- "bitflags 2.4.1",
- "byteorder",
- "diesel_derives",
- "itoa",
- "pq-sys",
- "serde_json",
-]
-
-[[package]]
-name = "diesel_derives"
-version = "2.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef8337737574f55a468005a83499da720f20c65586241ffea339db9ecdfd2b44"
-dependencies = [
- "diesel_table_macro_syntax",
- "proc-macro2",
- "quote",
- "syn 2.0.32",
-]
-
-[[package]]
-name = "diesel_migrations"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6036b3f0120c5961381b570ee20a02432d7e2d27ea60de9578799cf9156914ac"
-dependencies = [
- "diesel",
- "migrations_internals",
- "migrations_macros",
-]
-
-[[package]]
-name = "diesel_table_macro_syntax"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc5557efc453706fed5e4fa85006fe9817c224c3f480a34c7e5959fd700921c5"
-dependencies = [
- "syn 2.0.32",
-]
-
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -1911,13 +1872,13 @@ dependencies = [
 
 [[package]]
 name = "filetime"
-version = "0.2.22"
+version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d4029edd3e734da6fe05b6cd7bd2960760a616bd2ddd0d59a0124746d6272af0"
+checksum = "5cbc844cecaee9d4443931972e1289c8ff485cb4cc2767cb03ca139ed6885153"
 dependencies = [
  "cfg-if",
  "libc",
- "redox_syscall 0.3.5",
+ "redox_syscall 0.2.16",
  "windows-sys 0.48.0",
 ]
 
@@ -1934,7 +1895,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b9429470923de8e8cbd4d2dc513535400b4b3fef0319fb5c4e1f520a7bef743"
 dependencies = [
  "crc32fast",
- "miniz_oxide",
+ "miniz_oxide 0.7.1",
 ]
 
 [[package]]
@@ -2132,9 +2093,9 @@ dependencies = [
 
 [[package]]
 name = "gimli"
-version = "0.28.1"
+version = "0.27.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
+checksum = "ad0a93d233ebf96623465aad4046a8d3aa4da22d4f4beba5388838c8a434bbb4"
 
 [[package]]
 name = "git-version"
@@ -2601,16 +2562,6 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
-[[package]]
-name = "io-uring"
-version = "0.6.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "460648e47a07a43110fbfa2e0b14afb2be920093c31e5dccc50e49568e099762"
-dependencies = [
- "bitflags 1.3.2",
- "libc",
-]
-
 [[package]]
 name = "ipnet"
 version = "2.9.0"
@@ -2725,12 +2676,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "libm"
-version = "0.2.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ec2a862134d2a7d32d7983ddcdd1c4923530833c9f2ea1a44fc5fa473989058"
-
 [[package]]
 name = "linux-raw-sys"
 version = "0.1.4"
@@ -2819,15 +2764,6 @@ dependencies = [
  "autocfg",
 ]
 
-[[package]]
-name = "memoffset"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
-dependencies = [
- "autocfg",
-]
-
 [[package]]
 name = "metrics"
 version = "0.1.0"
@@ -2836,33 +2772,9 @@ dependencies = [
  "libc",
  "once_cell",
  "prometheus",
- "rand 0.8.5",
- "rand_distr",
- "twox-hash",
  "workspace_hack",
 ]
 
-[[package]]
-name = "migrations_internals"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f23f71580015254b020e856feac3df5878c2c7a8812297edd6c0a485ac9dada"
-dependencies = [
- "serde",
- "toml",
-]
-
-[[package]]
-name = "migrations_macros"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cce3325ac70e67bbab5bd837a31cae01f1a6db64e0e744a33cb03a543469ef08"
-dependencies = [
- "migrations_internals",
- "proc-macro2",
- "quote",
-]
-
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -2885,6 +2797,15 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
 
+[[package]]
+name = "miniz_oxide"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b275950c28b37e794e8c55d88aeb5e139d0ce23fdbbeda68f8d7174abdf9e8fa"
+dependencies = [
+ "adler",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.7.1"
@@ -2944,27 +2865,16 @@ dependencies = [
 
 [[package]]
 name = "nix"
-version = "0.26.4"
+version = "0.26.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "598beaf3cc6fdd9a5dfb1630c2800c7acd31df7aaf0f565796fba2b53ca1af1b"
+checksum = "bfdda3d196821d6af13126e40375cdf7da646a96114af134d5f417a9a1dc8e1a"
 dependencies = [
  "bitflags 1.3.2",
  "cfg-if",
  "libc",
  "memoffset 0.7.1",
  "pin-utils",
-]
-
-[[package]]
-name = "nix"
-version = "0.27.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"
-dependencies = [
- "bitflags 2.4.1",
- "cfg-if",
- "libc",
- "memoffset 0.9.0",
+ "static_assertions",
 ]
 
 [[package]]
@@ -2979,21 +2889,20 @@ dependencies = [
 
 [[package]]
 name = "notify"
-version = "6.1.1"
+version = "5.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6205bd8bb1e454ad2e27422015fb5e4f2bcc7e08fa8f27058670d208324a4d2d"
+checksum = "729f63e1ca555a43fe3efa4f3efdf4801c479da85b432242a7b726f353c88486"
 dependencies = [
- "bitflags 2.4.1",
+ "bitflags 1.3.2",
  "crossbeam-channel",
  "filetime",
  "fsevent-sys",
  "inotify 0.9.6",
  "kqueue",
  "libc",
- "log",
  "mio",
  "walkdir",
- "windows-sys 0.48.0",
+ "windows-sys 0.45.0",
 ]
 
 [[package]]
@@ -3077,7 +2986,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
 dependencies = [
  "autocfg",
- "libm",
 ]
 
 [[package]]
@@ -3120,9 +3028,9 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.32.2"
+version = "0.30.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6a622008b6e321afc04970976f62ee297fdbaa6f95318ca343e3eebb9648441"
+checksum = "ea86265d3d3dcb6a27fc51bd29a4bf387fae9d2986b823079d4986af253eb439"
 dependencies = [
  "memchr",
 ]
@@ -3194,9 +3102,9 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry"
-version = "0.20.0"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9591d937bc0e6d2feb6f71a559540ab300ea49955229c347a517a28d27784c54"
+checksum = "5f4b8347cc26099d3aeee044065ecc3ae11469796b4d65d065a23a584ed92a6f"
 dependencies = [
  "opentelemetry_api",
  "opentelemetry_sdk",
@@ -3204,9 +3112,9 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry-http"
-version = "0.9.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c7594ec0e11d8e33faf03530a4c49af7064ebba81c1480e01be67d90b356508b"
+checksum = "a819b71d6530c4297b49b3cae2939ab3a8cc1b9f382826a1bc29dd0ca3864906"
 dependencies = [
  "async-trait",
  "bytes",
@@ -3217,56 +3125,54 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry-otlp"
-version = "0.13.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e5e5a5c4135864099f3faafbe939eb4d7f9b80ebf68a8448da961b32a7c1275"
+checksum = "8af72d59a4484654ea8eb183fea5ae4eb6a41d7ac3e3bae5f4d2a282a3a7d3ca"
 dependencies = [
  "async-trait",
- "futures-core",
+ "futures",
+ "futures-util",
  "http",
+ "opentelemetry",
  "opentelemetry-http",
  "opentelemetry-proto",
- "opentelemetry-semantic-conventions",
- "opentelemetry_api",
- "opentelemetry_sdk",
  "prost",
  "reqwest",
  "thiserror",
- "tokio",
- "tonic",
 ]
 
 [[package]]
 name = "opentelemetry-proto"
-version = "0.3.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1e3f814aa9f8c905d0ee4bde026afd3b2577a97c10e1699912e3e44f0c4cbeb"
+checksum = "045f8eea8c0fa19f7d48e7bc3128a39c2e5c533d5c61298c548dfefc1064474c"
 dependencies = [
- "opentelemetry_api",
- "opentelemetry_sdk",
+ "futures",
+ "futures-util",
+ "opentelemetry",
  "prost",
- "tonic",
+ "tonic 0.8.3",
 ]
 
 [[package]]
 name = "opentelemetry-semantic-conventions"
-version = "0.12.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73c9f9340ad135068800e7f1b24e9e09ed9e7143f5bf8518ded3d3ec69789269"
+checksum = "24e33428e6bf08c6f7fcea4ddb8e358fab0fe48ab877a87c70c6ebe20f673ce5"
 dependencies = [
  "opentelemetry",
 ]
 
 [[package]]
 name = "opentelemetry_api"
-version = "0.20.0"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a81f725323db1b1206ca3da8bb19874bbd3f57c3bcd59471bfb04525b265b9b"
+checksum = "ed41783a5bf567688eb38372f2b7a8530f5a607a4b49d38dd7573236c23ca7e2"
 dependencies = [
+ "fnv",
  "futures-channel",
  "futures-util",
  "indexmap 1.9.3",
- "js-sys",
  "once_cell",
  "pin-project-lite",
  "thiserror",
@@ -3275,22 +3181,21 @@ dependencies = [
 
 [[package]]
 name = "opentelemetry_sdk"
-version = "0.20.0"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa8e705a0612d48139799fcbaba0d4a90f06277153e43dd2bdc16c6f0edd8026"
+checksum = "8b3a2a91fdbfdd4d212c0dcc2ab540de2c2bcbbd90be17de7a7daf8822d010c1"
 dependencies = [
  "async-trait",
  "crossbeam-channel",
+ "dashmap",
+ "fnv",
  "futures-channel",
  "futures-executor",
  "futures-util",
  "once_cell",
  "opentelemetry_api",
- "ordered-float 3.9.2",
  "percent-encoding",
  "rand 0.8.5",
- "regex",
- "serde_json",
  "thiserror",
  "tokio",
  "tokio-stream",
@@ -3305,15 +3210,6 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "ordered-float"
-version = "3.9.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1e1c390732d15f1d48471625cd92d154e66db2c56645e29a9cd26f4699f72dc"
-dependencies = [
- "num-traits",
-]
-
 [[package]]
 name = "ordered-multimap"
 version = "0.7.1"
@@ -3408,6 +3304,7 @@ dependencies = [
  "camino-tempfile",
  "chrono",
  "clap",
+ "close_fds",
  "const_format",
  "consumption_metrics",
  "crc32c",
@@ -3428,7 +3325,7 @@ dependencies = [
  "itertools",
  "md5",
  "metrics",
- "nix 0.27.1",
+ "nix 0.26.2",
  "num-traits",
  "num_cpus",
  "once_cell",
@@ -3461,7 +3358,6 @@ dependencies = [
  "tenant_size_model",
  "thiserror",
  "tokio",
- "tokio-epoll-uring",
  "tokio-io-timeout",
  "tokio-postgres",
  "tokio-stream",
@@ -3483,7 +3379,6 @@ dependencies = [
  "bincode",
  "byteorder",
  "bytes",
- "chrono",
  "const_format",
  "enum-map",
  "hex",
@@ -3885,15 +3780,6 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
-[[package]]
-name = "pq-sys"
-version = "0.4.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31c0052426df997c0cbd30789eb44ca097e3541717a7b8fa36b1c464ee7edebd"
-dependencies = [
- "vcpkg",
-]
-
 [[package]]
 name = "pq_proto"
 version = "0.1.0"
@@ -4058,6 +3944,7 @@ dependencies = [
  "metrics",
  "native-tls",
  "once_cell",
+ "opentelemetry",
  "parking_lot 0.12.1",
  "parquet",
  "parquet_derive",
@@ -4086,13 +3973,12 @@ dependencies = [
  "serde",
  "serde_json",
  "sha2",
+ "smallvec",
  "smol_str",
  "socket2 0.5.5",
  "sync_wrapper",
  "task-local-extensions",
  "thiserror",
- "tikv-jemalloc-ctl",
- "tikv-jemallocator",
  "tls-listener",
  "tokio",
  "tokio-postgres",
@@ -4100,6 +3986,7 @@ dependencies = [
  "tokio-rustls",
  "tokio-util",
  "tracing",
+ "tracing-opentelemetry",
  "tracing-subscriber",
  "tracing-utils",
  "url",
@@ -4192,16 +4079,6 @@ dependencies = [
  "getrandom 0.2.11",
 ]
 
-[[package]]
-name = "rand_distr"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32cb0b9bc82b0a0876c2dd994a7e7a2683d3e7390ca40e6886785ef0c7e3ee31"
-dependencies = [
- "num-traits",
- "rand 0.8.5",
-]
-
 [[package]]
 name = "rand_hc"
 version = "0.2.0"
@@ -4463,9 +4340,9 @@ dependencies = [
 
 [[package]]
 name = "reqwest-tracing"
-version = "0.4.7"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a0152176687dd5cfe7f507ac1cb1a491c679cfe483afd133a7db7aaea818bb3"
+checksum = "1b97ad83c2fc18113346b7158d79732242002427c30f620fa817c1f32901e0a8"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -5231,12 +5108,15 @@ name = "smallvec"
 version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "smol_str"
-version = "0.2.1"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6845563ada680337a52d43bb0b29f396f2d911616f6573012645b9e3d048a49"
+checksum = "74212e6bbe9a4352329b2f68ba3130c15a3f26fe88ff22dbdc6cdd58fa85e99c"
 dependencies = [
  "serde",
 ]
@@ -5319,7 +5199,7 @@ dependencies = [
  "prost",
  "tokio",
  "tokio-stream",
- "tonic",
+ "tonic 0.9.2",
  "tonic-build",
  "tracing",
  "utils",
@@ -5503,18 +5383,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.47"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97a802ec30afc17eee47b2855fc72e0c4cd62be9b4efe6591edde0ec5bd68d8f"
+checksum = "978c9a314bd8dc99be594bc3c175faaa9794be04a5a5e153caba6915336cebac"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.47"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6bb623b56e39ab7dcd4b1b98bb6c8f8d907ed255b18de254088016b27a8ee19b"
+checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -5539,38 +5419,7 @@ checksum = "7e54bc85fc7faa8bc175c4bab5b92ba8d9a3ce893d0e9f42cc455c8ab16a9e09"
 dependencies = [
  "byteorder",
  "integer-encoding",
- "ordered-float 2.10.1",
-]
-
-[[package]]
-name = "tikv-jemalloc-ctl"
-version = "0.5.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "619bfed27d807b54f7f776b9430d4f8060e66ee138a28632ca898584d462c31c"
-dependencies = [
- "libc",
- "paste",
- "tikv-jemalloc-sys",
-]
-
-[[package]]
-name = "tikv-jemalloc-sys"
-version = "0.5.4+5.3.0-patched"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9402443cb8fd499b6f327e40565234ff34dbda27460c5b47db0db77443dd85d1"
-dependencies = [
- "cc",
- "libc",
-]
-
-[[package]]
-name = "tikv-jemallocator"
-version = "0.5.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "965fe0c26be5c56c94e38ba547249074803efd52adfb66de62107d95aab3eaca"
-dependencies = [
- "libc",
- "tikv-jemalloc-sys",
+ "ordered-float",
 ]
 
 [[package]]
@@ -5669,22 +5518,6 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
-[[package]]
-name = "tokio-epoll-uring"
-version = "0.1.0"
-source = "git+https://github.com/neondatabase/tokio-epoll-uring.git?branch=main#0e1af4ccddf2f01805cfc9eaefa97ee13c04b52d"
-dependencies = [
- "futures",
- "nix 0.26.4",
- "once_cell",
- "scopeguard",
- "thiserror",
- "tokio",
- "tokio-util",
- "tracing",
- "uring-common",
-]
-
 [[package]]
 name = "tokio-io-timeout"
 version = "1.2.0"
@@ -5852,6 +5685,38 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "tonic"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f219fad3b929bef19b1f86fbc0358d35daed8f2cac972037ac0dc10bbb8d5fb"
+dependencies = [
+ "async-stream",
+ "async-trait",
+ "axum",
+ "base64 0.13.1",
+ "bytes",
+ "futures-core",
+ "futures-util",
+ "h2",
+ "http",
+ "http-body",
+ "hyper",
+ "hyper-timeout",
+ "percent-encoding",
+ "pin-project",
+ "prost",
+ "prost-derive",
+ "tokio",
+ "tokio-stream",
+ "tokio-util",
+ "tower",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+ "tracing-futures",
+]
+
 [[package]]
 name = "tonic"
 version = "0.9.2"
@@ -5995,6 +5860,16 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "tracing-futures"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97d095ae15e245a057c8e8451bab9b3ee1e1f68e9ba2b4fbc18d0ac5237835f2"
+dependencies = [
+ "pin-project",
+ "tracing",
+]
+
 [[package]]
 name = "tracing-log"
 version = "0.1.3"
@@ -6008,9 +5883,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-opentelemetry"
-version = "0.20.0"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc09e402904a5261e42cf27aea09ccb7d5318c6717a9eec3d8e2e65c56b18f19"
+checksum = "00a39dcf9bfc1742fa4d6215253b33a6e474be78275884c216fc2a06267b3600"
 dependencies = [
  "once_cell",
  "opentelemetry",
@@ -6194,15 +6069,6 @@ dependencies = [
  "webpki-roots 0.23.1",
 ]
 
-[[package]]
-name = "uring-common"
-version = "0.1.0"
-source = "git+https://github.com/neondatabase/tokio-epoll-uring.git?branch=main#0e1af4ccddf2f01805cfc9eaefa97ee13c04b52d"
-dependencies = [
- "io-uring",
- "libc",
-]
-
 [[package]]
 name = "url"
 version = "2.3.1"
@@ -6256,7 +6122,7 @@ dependencies = [
  "hyper",
  "jsonwebtoken",
  "metrics",
- "nix 0.27.1",
+ "nix 0.26.2",
  "once_cell",
  "pin-project-lite",
  "postgres_connection",
@@ -6764,9 +6630,10 @@ dependencies = [
  "clap",
  "clap_builder",
  "crossbeam-utils",
- "diesel",
+ "dashmap",
  "either",
  "fail",
+ "futures",
  "futures-channel",
  "futures-core",
  "futures-executor",
@@ -6811,7 +6678,6 @@ dependencies = [
  "tokio-util",
  "toml_datetime",
  "toml_edit",
- "tonic",
  "tower",
  "tracing",
  "tracing-core",

Cargo.toml

@@ -64,6 +64,7 @@ camino = "1.1.6"
 cfg-if = "1.0.0"
 chrono = { version = "0.4", default-features = false, features = ["clock"] }
 clap = { version = "4.0", features = ["derive"] }
+close_fds = "0.3.2"
 comfy-table = "6.1"
 const_format = "0.2"
 crc32c = "0.6"
@@ -98,14 +99,14 @@ libc = "0.2"
 md5 = "0.7.0"
 memoffset = "0.8"
 native-tls = "0.2"
-nix = { version = "0.27", features = ["fs", "process", "socket", "signal", "poll"] }
-notify = "6.0.0"
+nix = "0.26"
+notify = "5.0.0"
 num_cpus = "1.15"
 num-traits = "0.2.15"
 once_cell = "1.13"
-opentelemetry = "0.20.0"
-opentelemetry-otlp = { version = "0.13.0", default_features=false, features = ["http-proto", "trace", "http", "reqwest-client"] }
-opentelemetry-semantic-conventions = "0.12.0"
+opentelemetry = "0.19.0"
+opentelemetry-otlp = { version = "0.12.0", default_features=false, features = ["http-proto", "trace", "http", "reqwest-client"] }
+opentelemetry-semantic-conventions = "0.11.0"
 parking_lot = "0.12"
 parquet = { version = "49.0.0", default-features = false, features = ["zstd"] }
 parquet_derive = "49.0.0"
@@ -117,7 +118,7 @@ rand = "0.8"
 redis = { version = "0.24.0", features = ["tokio-rustls-comp", "keep-alive"] }
 regex = "1.10.2"
 reqwest = { version = "0.11", default-features = false, features = ["rustls-tls"] }
-reqwest-tracing = { version = "0.4.7", features = ["opentelemetry_0_20"] }
+reqwest-tracing = { version = "0.4.0", features = ["opentelemetry_0_19"] }
 reqwest-middleware = "0.2.0"
 reqwest-retry = "0.2.2"
 routerify = "3"
@@ -148,11 +149,8 @@ tar = "0.4"
 task-local-extensions = "0.1.4"
 test-context = "0.1"
 thiserror = "1.0"
-tikv-jemallocator = "0.5"
-tikv-jemalloc-ctl = "0.5"
 tls-listener = { version = "0.7", features = ["rustls", "hyper-h1"] }
 tokio = { version = "1.17", features = ["macros"] }
-tokio-epoll-uring = { git = "https://github.com/neondatabase/tokio-epoll-uring.git" , branch = "main" }
 tokio-io-timeout = "1.2.0"
 tokio-postgres-rustls = "0.10.0"
 tokio-rustls = "0.24"
@@ -164,9 +162,8 @@ toml_edit = "0.19"
 tonic = {version = "0.9", features = ["tls", "tls-roots"]}
 tracing = "0.1"
 tracing-error = "0.2.0"
-tracing-opentelemetry = "0.20.0"
+tracing-opentelemetry = "0.19.0"
 tracing-subscriber = { version = "0.3", default_features = false, features = ["smallvec", "fmt", "tracing-log", "std", "env-filter", "json"] }
-twox-hash = { version = "1.6.3", default-features = false }
 url = "2.2"
 uuid = { version = "1.6.1", features = ["v4", "v7", "serde"] }
 walkdir = "2.3.2"

Dockerfile

@@ -53,7 +53,6 @@ RUN set -e \
       --bin pagectl  \
       --bin safekeeper  \
       --bin storage_broker  \
-      --bin attachment_service  \
       --bin proxy  \
       --bin neon_local \
       --locked --release \
@@ -81,7 +80,6 @@ COPY --from=build --chown=neon:neon /home/nonroot/target/release/pageserver
 COPY --from=build --chown=neon:neon /home/nonroot/target/release/pagectl             /usr/local/bin
 COPY --from=build --chown=neon:neon /home/nonroot/target/release/safekeeper          /usr/local/bin
 COPY --from=build --chown=neon:neon /home/nonroot/target/release/storage_broker      /usr/local/bin
-COPY --from=build --chown=neon:neon /home/nonroot/target/release/attachment_service  /usr/local/bin
 COPY --from=build --chown=neon:neon /home/nonroot/target/release/proxy               /usr/local/bin
 COPY --from=build --chown=neon:neon /home/nonroot/target/release/neon_local          /usr/local/bin
 

Dockerfile.compute-node

@@ -52,7 +52,7 @@ RUN cd postgres && \
     # We need to grant EXECUTE on pg_stat_statements_reset() to neon_superuser.
     # In vanilla postgres this function is limited to Postgres role superuser.
     # In neon we have neon_superuser role that is not a superuser but replaces superuser in some cases.
-    # We could add the additional grant statements to the postgres repository but it would be hard to maintain,
+    # We could add the additional grant statements to the postgres repository but it would be hard to maintain, 
     # whenever we need to pick up a new postgres version and we want to limit the changes in our postgres fork,
     # so we do it here.
     old_list="pg_stat_statements--1.0--1.1.sql pg_stat_statements--1.1--1.2.sql pg_stat_statements--1.2--1.3.sql pg_stat_statements--1.3--1.4.sql pg_stat_statements--1.4--1.5.sql pg_stat_statements--1.4.sql pg_stat_statements--1.5--1.6.sql"; \
@@ -63,14 +63,14 @@ RUN cd postgres && \
             echo 'GRANT EXECUTE ON FUNCTION pg_stat_statements_reset() TO neon_superuser;' >> $file; \
         fi; \
     done; \
-    # the second loop is for pg_stat_statement extension versions >= 1.7,
+    # the second loop is for pg_stat_statement extension versions >= 1.7, 
     # where pg_stat_statement_reset() got 3 additional arguments
     for file in /usr/local/pgsql/share/extension/pg_stat_statements--*.sql; do \
         filename=$(basename "$file"); \
         if ! echo "$old_list" | grep -q -F "$filename"; then \
             echo 'GRANT EXECUTE ON FUNCTION pg_stat_statements_reset(Oid, Oid, bigint) TO neon_superuser;' >> $file; \
         fi; \
-    done
+    done      
 
 #########################################################################################
 #
@@ -144,23 +144,30 @@ RUN wget https://github.com/pgRouting/pgrouting/archive/v3.4.2.tar.gz -O pgrouti
 FROM build-deps AS plv8-build
 COPY --from=pg-build /usr/local/pgsql/ /usr/local/pgsql/
 
+ARG PG_VERSION
 RUN apt update && \
     apt install -y ninja-build python3-dev libncurses5 binutils clang
 
-RUN wget https://github.com/plv8/plv8/archive/refs/tags/v3.1.10.tar.gz -O plv8.tar.gz && \
-    echo "7096c3290928561f0d4901b7a52794295dc47f6303102fae3f8e42dd575ad97d plv8.tar.gz" | sha256sum --check && \
+RUN case "${PG_VERSION}" in \
+      "v14" | "v15") \
+        export PLV8_VERSION=3.1.5 \
+        export PLV8_CHECKSUM=1e108d5df639e4c189e1c5bdfa2432a521c126ca89e7e5a969d46899ca7bf106 \
+        ;; \
+      "v16") \
+        export PLV8_VERSION=3.1.8 \
+        export PLV8_CHECKSUM=92b10c7db39afdae97ff748c9ec54713826af222c459084ad002571b79eb3f49 \
+        ;; \
+      *) \
+        echo "Export the valid PG_VERSION variable" && exit 1 \
+        ;; \
+    esac && \
+    wget https://github.com/plv8/plv8/archive/refs/tags/v${PLV8_VERSION}.tar.gz -O plv8.tar.gz && \
+    echo "${PLV8_CHECKSUM} plv8.tar.gz" | sha256sum --check && \
     mkdir plv8-src && cd plv8-src && tar xvzf ../plv8.tar.gz --strip-components=1 -C . && \
-    # generate and copy upgrade scripts
-    mkdir -p upgrade && ./generate_upgrade.sh 3.1.10 && \
-    cp upgrade/* /usr/local/pgsql/share/extension/ && \
     export PATH="/usr/local/pgsql/bin:$PATH" && \
     make DOCKER=1 -j $(getconf _NPROCESSORS_ONLN) install && \
     rm -rf /plv8-* && \
     find /usr/local/pgsql/ -name "plv8-*.so" | xargs strip && \
-    # don't break computes with installed old version of plv8
-    cd /usr/local/pgsql/lib/ && \
-    ln -s plv8-3.1.10.so plv8-3.1.5.so && \
-    ln -s plv8-3.1.10.so plv8-3.1.8.so && \
     echo 'trusted = true' >> /usr/local/pgsql/share/extension/plv8.control && \
     echo 'trusted = true' >> /usr/local/pgsql/share/extension/plcoffee.control && \
     echo 'trusted = true' >> /usr/local/pgsql/share/extension/plls.control
@@ -241,12 +248,9 @@ RUN wget https://github.com/df7cb/postgresql-unit/archive/refs/tags/7.7.tar.gz -
 FROM build-deps AS vector-pg-build
 COPY --from=pg-build /usr/local/pgsql/ /usr/local/pgsql/
 
-COPY patches/pgvector.patch /pgvector.patch
-
-RUN wget https://github.com/pgvector/pgvector/archive/refs/tags/v0.6.0.tar.gz -O pgvector.tar.gz && \
-    echo "b0cf4ba1ab016335ac8fb1cada0d2106235889a194fffeece217c5bda90b2f19 pgvector.tar.gz" | sha256sum --check && \
+RUN wget https://github.com/pgvector/pgvector/archive/refs/tags/v0.5.1.tar.gz -O pgvector.tar.gz && \
+    echo "cc7a8e034a96e30a819911ac79d32f6bc47bdd1aa2de4d7d4904e26b83209dc8 pgvector.tar.gz" | sha256sum --check && \
     mkdir pgvector-src && cd pgvector-src && tar xvzf ../pgvector.tar.gz --strip-components=1 -C . && \
-    patch -p1 < /pgvector.patch && \
     make -j $(getconf _NPROCESSORS_ONLN) PG_CONFIG=/usr/local/pgsql/bin/pg_config && \
     make -j $(getconf _NPROCESSORS_ONLN) install PG_CONFIG=/usr/local/pgsql/bin/pg_config && \
     echo 'trusted = true' >> /usr/local/pgsql/share/extension/vector.control
@@ -523,7 +527,8 @@ RUN apt-get update && \
         libboost-regex1.74-dev \
         libboost-serialization1.74-dev \
         libboost-system1.74-dev \
-        libeigen3-dev
+        libeigen3-dev \
+        libfreetype6-dev
 
 ENV PATH "/usr/local/pgsql/bin/:/usr/local/pgsql/:$PATH"
 RUN wget https://github.com/rdkit/rdkit/archive/refs/tags/Release_2023_03_3.tar.gz -O rdkit.tar.gz && \
@@ -548,8 +553,6 @@ RUN wget https://github.com/rdkit/rdkit/archive/refs/tags/Release_2023_03_3.tar.
         -D PostgreSQL_TYPE_INCLUDE_DIR=`pg_config --includedir-server` \
         -D PostgreSQL_LIBRARY_DIR=`pg_config --libdir` \
         -D RDK_INSTALL_INTREE=OFF \
-        -D RDK_INSTALL_COMIC_FONTS=OFF \
-        -D RDK_BUILD_FREETYPE_SUPPORT=OFF \
         -D CMAKE_BUILD_TYPE=Release \
         . && \
     make -j $(getconf _NPROCESSORS_ONLN) && \
@@ -904,7 +907,7 @@ COPY --from=compute-tools --chown=postgres /home/nonroot/target/release-line-deb
 # libgeos, libgdal, libsfcgal1, libproj and libprotobuf-c1 for PostGIS
 # libxml2, libxslt1.1 for xml2
 # libzstd1 for zstd
-# libboost* for rdkit
+# libboost*, libfreetype6, and zlib1g for rdkit
 # ca-certificates for communicating with s3 by compute_ctl
 RUN apt update &&  \
     apt install --no-install-recommends -y \
@@ -917,6 +920,7 @@ RUN apt update &&  \
         libboost-serialization1.74.0 \
         libboost-system1.74.0 \
         libossp-uuid16 \
+        libfreetype6 \
         libgeos-c1v5 \
         libgdal28 \
         libproj19 \
@@ -928,6 +932,7 @@ RUN apt update &&  \
         libcurl4-openssl-dev \
         locales \
         procps \
+        zlib1g \
         ca-certificates && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
     localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8

Makefile

@@ -51,8 +51,6 @@ CARGO_BUILD_FLAGS += $(filter -j1,$(MAKEFLAGS))
 CARGO_CMD_PREFIX += $(if $(filter n,$(MAKEFLAGS)),,+)
 # Force cargo not to print progress bar
 CARGO_CMD_PREFIX += CARGO_TERM_PROGRESS_WHEN=never CI=1
-# Set PQ_LIB_DIR to make sure `attachment_service` get linked with bundled libpq (through diesel)
-CARGO_CMD_PREFIX += PQ_LIB_DIR=$(POSTGRES_INSTALL_DIR)/v16/lib
 
 #
 # Top level Makefile to build Neon and PostgreSQL
@@ -176,10 +174,10 @@ neon-pg-ext-clean-%:
 
 # Build walproposer as a static library. walproposer source code is located
 # in the pgxn/neon directory.
-#
+# 
 # We also need to include libpgport.a and libpgcommon.a, because walproposer
 # uses some functions from those libraries.
-#
+# 
 # Some object files are removed from libpgport.a and libpgcommon.a because
 # they depend on openssl and other libraries that are not included in our
 # Rust build.

compute_tools/src/compute.rs

@@ -319,7 +319,7 @@ impl ComputeNode {
     // Get basebackup from the libpq connection to pageserver using `connstr` and
     // unarchive it to `pgdata` directory overriding all its previous content.
     #[instrument(skip_all, fields(%lsn))]
-    fn try_get_basebackup(&self, compute_state: &ComputeState, lsn: Lsn) -> Result<()> {
+    fn get_basebackup(&self, compute_state: &ComputeState, lsn: Lsn) -> Result<()> {
         let spec = compute_state.pspec.as_ref().expect("spec must be set");
         let start_time = Instant::now();
 
@@ -390,34 +390,6 @@ impl ComputeNode {
         Ok(())
     }
 
-    // Gets the basebackup in a retry loop
-    #[instrument(skip_all, fields(%lsn))]
-    pub fn get_basebackup(&self, compute_state: &ComputeState, lsn: Lsn) -> Result<()> {
-        let mut retry_period_ms = 500;
-        let mut attempts = 0;
-        let max_attempts = 5;
-        loop {
-            let result = self.try_get_basebackup(compute_state, lsn);
-            match result {
-                Ok(_) => {
-                    return result;
-                }
-                Err(ref e) if attempts < max_attempts => {
-                    warn!(
-                        "Failed to get basebackup: {} (attempt {}/{})",
-                        e, attempts, max_attempts
-                    );
-                    std::thread::sleep(std::time::Duration::from_millis(retry_period_ms));
-                    retry_period_ms *= 2;
-                }
-                Err(_) => {
-                    return result;
-                }
-            }
-            attempts += 1;
-        }
-    }
-
     pub async fn check_safekeepers_synced_async(
         &self,
         compute_state: &ComputeState,
@@ -728,14 +700,13 @@ impl ComputeNode {
         // In this case we need to connect with old `zenith_admin` name
         // and create new user. We cannot simply rename connected user,
         // but we can create a new one and grant it all privileges.
-        let connstr = self.connstr.clone();
-        let mut client = match Client::connect(connstr.as_str(), NoTls) {
+        let mut client = match Client::connect(self.connstr.as_str(), NoTls) {
             Err(e) => {
                 info!(
                     "cannot connect to postgres: {}, retrying with `zenith_admin` username",
                     e
                 );
-                let mut zenith_admin_connstr = connstr.clone();
+                let mut zenith_admin_connstr = self.connstr.clone();
 
                 zenith_admin_connstr
                     .set_username("zenith_admin")
@@ -748,8 +719,8 @@ impl ComputeNode {
                 client.simple_query("GRANT zenith_admin TO cloud_admin")?;
                 drop(client);
 
-                // reconnect with connstring with expected name
-                Client::connect(connstr.as_str(), NoTls)?
+                // reconnect with connsting with expected name
+                Client::connect(self.connstr.as_str(), NoTls)?
             }
             Ok(client) => client,
         };
@@ -763,8 +734,8 @@ impl ComputeNode {
         cleanup_instance(&mut client)?;
         handle_roles(spec, &mut client)?;
         handle_databases(spec, &mut client)?;
-        handle_role_deletions(spec, connstr.as_str(), &mut client)?;
-        handle_grants(spec, &mut client, connstr.as_str())?;
+        handle_role_deletions(spec, self.connstr.as_str(), &mut client)?;
+        handle_grants(spec, &mut client, self.connstr.as_str())?;
         handle_extensions(spec, &mut client)?;
         handle_extension_neon(&mut client)?;
         create_availability_check_data(&mut client)?;
@@ -772,12 +743,6 @@ impl ComputeNode {
         // 'Close' connection
         drop(client);
 
-        if self.has_feature(ComputeFeature::Migrations) {
-            thread::spawn(move || {
-                let mut client = Client::connect(connstr.as_str(), NoTls)?;
-                handle_migrations(&mut client)
-            });
-        }
         Ok(())
     }
 
@@ -842,10 +807,6 @@ impl ComputeNode {
             handle_grants(&spec, &mut client, self.connstr.as_str())?;
             handle_extensions(&spec, &mut client)?;
             handle_extension_neon(&mut client)?;
-            // We can skip handle_migrations here because a new migration can only appear
-            // if we have a new version of the compute_ctl binary, which can only happen
-            // if compute got restarted, in which case we'll end up inside of apply_config
-            // instead of reconfigure.
         }
 
         // 'Close' connection

compute_tools/src/spec.rs

@@ -727,87 +727,3 @@ pub fn handle_extension_neon(client: &mut Client) -> Result<()> {
 
     Ok(())
 }
-
-#[instrument(skip_all)]
-pub fn handle_migrations(client: &mut Client) -> Result<()> {
-    info!("handle migrations");
-
-    // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-    // !BE SURE TO ONLY ADD MIGRATIONS TO THE END OF THIS ARRAY. IF YOU DO NOT, VERY VERY BAD THINGS MAY HAPPEN!
-    // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-    let migrations = [
-        "ALTER ROLE neon_superuser BYPASSRLS",
-        r#"
-DO $$
-DECLARE
-    role_name text;
-BEGIN
-    FOR role_name IN SELECT rolname FROM pg_roles WHERE pg_has_role(rolname, 'neon_superuser', 'member')
-    LOOP
-        RAISE NOTICE 'EXECUTING ALTER ROLE % INHERIT', quote_ident(role_name);
-        EXECUTE 'ALTER ROLE ' || quote_ident(role_name) || ' INHERIT';
-    END LOOP;
-
-    FOR role_name IN SELECT rolname FROM pg_roles
-        WHERE
-            NOT pg_has_role(rolname, 'neon_superuser', 'member') AND NOT starts_with(rolname, 'pg_')
-    LOOP
-        RAISE NOTICE 'EXECUTING ALTER ROLE % NOBYPASSRLS', quote_ident(role_name);
-        EXECUTE 'ALTER ROLE ' || quote_ident(role_name) || ' NOBYPASSRLS';
-    END LOOP;
-END $$;
-"#,
-        r#"
-DO $$
-BEGIN
-    IF (SELECT setting::numeric >= 160000 FROM pg_settings WHERE name = 'server_version_num') THEN
-        EXECUTE 'GRANT pg_create_subscription TO neon_superuser';
-    END IF;
-END
-$$;"#,
-    ];
-
-    let mut query = "CREATE SCHEMA IF NOT EXISTS neon_migration";
-    client.simple_query(query)?;
-
-    query = "CREATE TABLE IF NOT EXISTS neon_migration.migration_id (key INT NOT NULL PRIMARY KEY, id bigint NOT NULL DEFAULT 0)";
-    client.simple_query(query)?;
-
-    query = "INSERT INTO neon_migration.migration_id VALUES (0, 0) ON CONFLICT DO NOTHING";
-    client.simple_query(query)?;
-
-    query = "ALTER SCHEMA neon_migration OWNER TO cloud_admin";
-    client.simple_query(query)?;
-
-    query = "REVOKE ALL ON SCHEMA neon_migration FROM PUBLIC";
-    client.simple_query(query)?;
-
-    query = "SELECT id FROM neon_migration.migration_id";
-    let row = client.query_one(query, &[])?;
-    let mut current_migration: usize = row.get::<&str, i64>("id") as usize;
-    let starting_migration_id = current_migration;
-
-    query = "BEGIN";
-    client.simple_query(query)?;
-
-    while current_migration < migrations.len() {
-        info!("Running migration:\n{}\n", migrations[current_migration]);
-        client.simple_query(migrations[current_migration])?;
-        current_migration += 1;
-    }
-    let setval = format!(
-        "UPDATE neon_migration.migration_id SET id={}",
-        migrations.len()
-    );
-    client.simple_query(&setval)?;
-
-    query = "COMMIT";
-    client.simple_query(query)?;
-
-    info!(
-        "Ran {} migrations",
-        (migrations.len() - starting_migration_id)
-    );
-    Ok(())
-}

control_plane/Cargo.toml

@@ -10,8 +10,6 @@ async-trait.workspace = true
 camino.workspace = true
 clap.workspace = true
 comfy-table.workspace = true
-diesel = { version = "2.1.4", features = ["postgres"]}
-diesel_migrations = { version = "2.1.0", features = ["postgres"]}
 futures.workspace = true
 git-version.workspace = true
 nix.workspace = true
@@ -21,7 +19,6 @@ hex.workspace = true
 hyper.workspace = true
 regex.workspace = true
 reqwest = { workspace = true, features = ["blocking", "json"] }
-scopeguard.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 serde_with.workspace = true

control_plane/attachment_service/Cargo.toml

@@ -21,7 +21,9 @@ tokio.workspace = true
 tokio-util.workspace = true
 tracing.workspace = true
 
-diesel = { version = "2.1.4", features = ["serde_json", "postgres"] }
+# TODO: remove this after DB persistence is added, it is only used for
+# a parsing function when loading pageservers from neon_local LocalEnv
+postgres_backend.workspace = true
 
 utils = { path = "../../libs/utils/" }
 metrics = { path = "../../libs/metrics/" }

control_plane/attachment_service/migrations/00000000000000_diesel_initial_setup/down.sql

@@ -1,6 +0,0 @@
--- This file was automatically created by Diesel to setup helper functions
--- and other internal bookkeeping. This file is safe to edit, any future
--- changes will be added to existing projects as new migrations.
-
-DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
-DROP FUNCTION IF EXISTS diesel_set_updated_at();

control_plane/attachment_service/migrations/00000000000000_diesel_initial_setup/up.sql

@@ -1,36 +0,0 @@
--- This file was automatically created by Diesel to setup helper functions
--- and other internal bookkeeping. This file is safe to edit, any future
--- changes will be added to existing projects as new migrations.
-
-
-
-
--- Sets up a trigger for the given table to automatically set a column called
--- `updated_at` whenever the row is modified (unless `updated_at` was included
--- in the modified columns)
---
--- # Example
---
--- ```sql
--- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
---
--- SELECT diesel_manage_updated_at('users');
--- ```
-CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
-BEGIN
-    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
-                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
-END;
-$$ LANGUAGE plpgsql;
-
-CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
-BEGIN
-    IF (
-        NEW IS DISTINCT FROM OLD AND
-        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
-    ) THEN
-        NEW.updated_at := current_timestamp;
-    END IF;
-    RETURN NEW;
-END;
-$$ LANGUAGE plpgsql;

control_plane/attachment_service/migrations/2024-01-07-211257_create_tenant_shards/down.sql

@@ -1 +0,0 @@
-DROP TABLE tenant_shards;

control_plane/attachment_service/migrations/2024-01-07-211257_create_tenant_shards/up.sql

@@ -1,12 +0,0 @@
-CREATE TABLE tenant_shards (
-  tenant_id VARCHAR NOT NULL,
-  shard_number INTEGER NOT NULL,
-  shard_count INTEGER NOT NULL,
-  PRIMARY KEY(tenant_id, shard_number, shard_count),
-  shard_stripe_size INTEGER NOT NULL,
-  generation INTEGER NOT NULL,
-  generation_pageserver BIGINT NOT NULL,
-  placement_policy VARCHAR NOT NULL,
-  -- config is JSON encoded, opaque to the database.
-  config TEXT NOT NULL
-);

control_plane/attachment_service/migrations/2024-01-07-212945_create_nodes/down.sql

@@ -1 +0,0 @@
-DROP TABLE nodes;

control_plane/attachment_service/migrations/2024-01-07-212945_create_nodes/up.sql

@@ -1,10 +0,0 @@
-CREATE TABLE nodes (
-  node_id BIGINT PRIMARY KEY NOT NULL,
-
-  scheduling_policy VARCHAR NOT NULL,
-
-  listen_http_addr VARCHAR NOT NULL,
-  listen_http_port INTEGER NOT NULL,
-  listen_pg_addr VARCHAR NOT NULL,
-  listen_pg_port INTEGER NOT NULL
-);

control_plane/attachment_service/src/http.rs

@@ -1,18 +1,14 @@
 use crate::reconciler::ReconcileError;
-use crate::service::{Service, STARTUP_RECONCILE_TIMEOUT};
+use crate::service::Service;
 use hyper::{Body, Request, Response};
 use hyper::{StatusCode, Uri};
-use pageserver_api::models::{
-    TenantCreateRequest, TenantLocationConfigRequest, TimelineCreateRequest,
-};
+use pageserver_api::models::{TenantCreateRequest, TimelineCreateRequest};
 use pageserver_api::shard::TenantShardId;
-use pageserver_client::mgmt_api;
 use std::sync::Arc;
-use std::time::{Duration, Instant};
 use utils::auth::SwappableJwtAuth;
 use utils::http::endpoint::{auth_middleware, request_span};
 use utils::http::request::parse_request_param;
-use utils::id::{TenantId, TimelineId};
+use utils::id::TenantId;
 
 use utils::{
     http::{
@@ -108,163 +104,34 @@ async fn handle_inspect(mut req: Request<Body>) -> Result<Response<Body>, ApiErr
     json_response(StatusCode::OK, state.service.inspect(inspect_req))
 }
 
-async fn handle_tenant_create(
-    service: Arc<Service>,
-    mut req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
+async fn handle_tenant_create(mut req: Request<Body>) -> Result<Response<Body>, ApiError> {
     let create_req = json_request::<TenantCreateRequest>(&mut req).await?;
-    json_response(StatusCode::OK, service.tenant_create(create_req).await?)
-}
-
-// For tenant and timeline deletions, which both implement an "initially return 202, then 404 once
-// we're done" semantic, we wrap with a retry loop to expose a simpler API upstream.  This avoids
-// needing to track a "deleting" state for tenants.
-async fn deletion_wrapper<R, F>(service: Arc<Service>, f: F) -> Result<Response<Body>, ApiError>
-where
-    R: std::future::Future<Output = Result<StatusCode, ApiError>> + Send + 'static,
-    F: Fn(Arc<Service>) -> R + Send + Sync + 'static,
-{
-    let started_at = Instant::now();
-    // To keep deletion reasonably snappy for small tenants, initially check after 1 second if deletion
-    // completed.
-    let mut retry_period = Duration::from_secs(1);
-    // On subsequent retries, wait longer.
-    let max_retry_period = Duration::from_secs(5);
-    // Enable callers with a 30 second request timeout to reliably get a response
-    let max_wait = Duration::from_secs(25);
-
-    loop {
-        let status = f(service.clone()).await?;
-        match status {
-            StatusCode::ACCEPTED => {
-                tracing::info!("Deletion accepted, waiting to try again...");
-                tokio::time::sleep(retry_period).await;
-                retry_period = max_retry_period;
-            }
-            StatusCode::NOT_FOUND => {
-                tracing::info!("Deletion complete");
-                return json_response(StatusCode::OK, ());
-            }
-            _ => {
-                tracing::warn!("Unexpected status {status}");
-                return json_response(status, ());
-            }
-        }
-
-        let now = Instant::now();
-        if now + retry_period > started_at + max_wait {
-            tracing::info!("Deletion timed out waiting for 404");
-            // REQUEST_TIMEOUT would be more appropriate, but CONFLICT is already part of
-            // the pageserver's swagger definition for this endpoint, and has the same desired
-            // effect of causing the control plane to retry later.
-            return json_response(StatusCode::CONFLICT, ());
-        }
-    }
-}
-
-async fn handle_tenant_location_config(
-    service: Arc<Service>,
-    mut req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
-    let tenant_id: TenantId = parse_request_param(&req, "tenant_id")?;
-    let config_req = json_request::<TenantLocationConfigRequest>(&mut req).await?;
+    let state = get_state(&req);
     json_response(
         StatusCode::OK,
-        service
-            .tenant_location_config(tenant_id, config_req)
-            .await?,
+        state.service.tenant_create(create_req).await?,
     )
 }
 
-async fn handle_tenant_delete(
-    service: Arc<Service>,
-    req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
-    let tenant_id: TenantId = parse_request_param(&req, "tenant_id")?;
-
-    deletion_wrapper(service, move |service| async move {
-        service.tenant_delete(tenant_id).await
-    })
-    .await
-}
-
-async fn handle_tenant_timeline_create(
-    service: Arc<Service>,
-    mut req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
+async fn handle_tenant_timeline_create(mut req: Request<Body>) -> Result<Response<Body>, ApiError> {
     let tenant_id: TenantId = parse_request_param(&req, "tenant_id")?;
     let create_req = json_request::<TimelineCreateRequest>(&mut req).await?;
+
+    let state = get_state(&req);
     json_response(
         StatusCode::OK,
-        service
+        state
+            .service
             .tenant_timeline_create(tenant_id, create_req)
             .await?,
     )
 }
 
-async fn handle_tenant_timeline_delete(
-    service: Arc<Service>,
-    req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
+async fn handle_tenant_locate(req: Request<Body>) -> Result<Response<Body>, ApiError> {
     let tenant_id: TenantId = parse_request_param(&req, "tenant_id")?;
-    let timeline_id: TimelineId = parse_request_param(&req, "timeline_id")?;
+    let state = get_state(&req);
 
-    deletion_wrapper(service, move |service| async move {
-        service.tenant_timeline_delete(tenant_id, timeline_id).await
-    })
-    .await
-}
-
-async fn handle_tenant_timeline_passthrough(
-    service: Arc<Service>,
-    req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
-    let tenant_id: TenantId = parse_request_param(&req, "tenant_id")?;
-
-    let Some(path) = req.uri().path_and_query() else {
-        // This should never happen, our request router only calls us if there is a path
-        return Err(ApiError::BadRequest(anyhow::anyhow!("Missing path")));
-    };
-
-    tracing::info!("Proxying request for tenant {} ({})", tenant_id, path);
-
-    // Find the node that holds shard zero
-    let (base_url, tenant_shard_id) = service.tenant_shard0_baseurl(tenant_id)?;
-
-    // Callers will always pass an unsharded tenant ID.  Before proxying, we must
-    // rewrite this to a shard-aware shard zero ID.
-    let path = format!("{}", path);
-    let tenant_str = tenant_id.to_string();
-    let tenant_shard_str = format!("{}", tenant_shard_id);
-    let path = path.replace(&tenant_str, &tenant_shard_str);
-
-    let client = mgmt_api::Client::new(base_url, service.get_config().jwt_token.as_deref());
-    let resp = client.get_raw(path).await.map_err(|_e|
-        // FIXME: give APiError a proper Unavailable variant.  We return 503 here because
-        // if we can't successfully send a request to the pageserver, we aren't available.
-        ApiError::ShuttingDown)?;
-
-    // We have a reqest::Response, would like a http::Response
-    let mut builder = hyper::Response::builder()
-        .status(resp.status())
-        .version(resp.version());
-    for (k, v) in resp.headers() {
-        builder = builder.header(k, v);
-    }
-
-    let response = builder
-        .body(Body::wrap_stream(resp.bytes_stream()))
-        .map_err(|e| ApiError::InternalServerError(e.into()))?;
-
-    Ok(response)
-}
-
-async fn handle_tenant_locate(
-    service: Arc<Service>,
-    req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
-    let tenant_id: TenantId = parse_request_param(&req, "tenant_id")?;
-    json_response(StatusCode::OK, service.tenant_locate(tenant_id)?)
+    json_response(StatusCode::OK, state.service.tenant_locate(tenant_id)?)
 }
 
 async fn handle_node_register(mut req: Request<Body>) -> Result<Response<Body>, ApiError> {
@@ -274,11 +141,6 @@ async fn handle_node_register(mut req: Request<Body>) -> Result<Response<Body>,
     json_response(StatusCode::OK, ())
 }
 
-async fn handle_node_list(req: Request<Body>) -> Result<Response<Body>, ApiError> {
-    let state = get_state(&req);
-    json_response(StatusCode::OK, state.service.node_list().await?)
-}
-
 async fn handle_node_configure(mut req: Request<Body>) -> Result<Response<Body>, ApiError> {
     let node_id: NodeId = parse_request_param(&req, "node_id")?;
     let config_req = json_request::<NodeConfigureRequest>(&mut req).await?;
@@ -292,15 +154,14 @@ async fn handle_node_configure(mut req: Request<Body>) -> Result<Response<Body>,
     json_response(StatusCode::OK, state.service.node_configure(config_req)?)
 }
 
-async fn handle_tenant_shard_migrate(
-    service: Arc<Service>,
-    mut req: Request<Body>,
-) -> Result<Response<Body>, ApiError> {
+async fn handle_tenant_shard_migrate(mut req: Request<Body>) -> Result<Response<Body>, ApiError> {
     let tenant_shard_id: TenantShardId = parse_request_param(&req, "tenant_shard_id")?;
     let migrate_req = json_request::<TenantShardMigrateRequest>(&mut req).await?;
+    let state = get_state(&req);
     json_response(
         StatusCode::OK,
-        service
+        state
+            .service
             .tenant_shard_migrate(tenant_shard_id, migrate_req)
             .await?,
     )
@@ -317,35 +178,6 @@ impl From<ReconcileError> for ApiError {
     }
 }
 
-/// Common wrapper for request handlers that call into Service and will operate on tenants: they must only
-/// be allowed to run if Service has finished its initial reconciliation.
-async fn tenant_service_handler<R, H>(request: Request<Body>, handler: H) -> R::Output
-where
-    R: std::future::Future<Output = Result<Response<Body>, ApiError>> + Send + 'static,
-    H: FnOnce(Arc<Service>, Request<Body>) -> R + Send + Sync + 'static,
-{
-    let state = get_state(&request);
-    let service = state.service.clone();
-
-    let startup_complete = service.startup_complete.clone();
-    if tokio::time::timeout(STARTUP_RECONCILE_TIMEOUT, startup_complete.wait())
-        .await
-        .is_err()
-    {
-        // This shouldn't happen: it is the responsibilty of [`Service::startup_reconcile`] to use appropriate
-        // timeouts around its remote calls, to bound its runtime.
-        return Err(ApiError::Timeout(
-            "Timed out waiting for service readiness".into(),
-        ));
-    }
-
-    request_span(
-        request,
-        |request| async move { handler(service, request).await },
-    )
-    .await
-}
-
 pub fn make_router(
     service: Arc<Service>,
     auth: Option<Arc<SwappableJwtAuth>>,
@@ -364,67 +196,23 @@ pub fn make_router(
 
     router
         .data(Arc::new(HttpState::new(service, auth)))
-        // Non-prefixed generic endpoints (status, metrics)
         .get("/status", |r| request_span(r, handle_status))
-        // Upcalls for the pageserver: point the pageserver's `control_plane_api` config to this prefix
-        .post("/upcall/v1/re-attach", |r| {
-            request_span(r, handle_re_attach)
-        })
-        .post("/upcall/v1/validate", |r| request_span(r, handle_validate))
-        // Test/dev/debug endpoints
-        .post("/debug/v1/attach-hook", |r| {
-            request_span(r, handle_attach_hook)
-        })
-        .post("/debug/v1/inspect", |r| request_span(r, handle_inspect))
-        .get("/control/v1/tenant/:tenant_id/locate", |r| {
-            tenant_service_handler(r, handle_tenant_locate)
-        })
-        // Node operations
-        .post("/control/v1/node", |r| {
-            request_span(r, handle_node_register)
-        })
-        .get("/control/v1/node", |r| request_span(r, handle_node_list))
-        .put("/control/v1/node/:node_id/config", |r| {
-            request_span(r, handle_node_configure)
-        })
-        // Tenant Shard operations
-        .put("/control/v1/tenant/:tenant_shard_id/migrate", |r| {
-            tenant_service_handler(r, handle_tenant_shard_migrate)
-        })
-        // Tenant operations
-        // The ^/v1/ endpoints act as a "Virtual Pageserver", enabling shard-naive clients to call into
-        // this service to manage tenants that actually consist of many tenant shards, as if they are a single entity.
-        .post("/v1/tenant", |r| {
-            tenant_service_handler(r, handle_tenant_create)
-        })
-        .delete("/v1/tenant/:tenant_id", |r| {
-            tenant_service_handler(r, handle_tenant_delete)
-        })
-        .put("/v1/tenant/:tenant_id/location_config", |r| {
-            tenant_service_handler(r, handle_tenant_location_config)
-        })
-        // Tenant Shard operations (low level/maintenance)
-        .put("/tenant/:tenant_shard_id/migrate", |r| {
-            tenant_service_handler(r, handle_tenant_shard_migrate)
-        })
-        // Timeline operations
-        .delete("/v1/tenant/:tenant_id/timeline/:timeline_id", |r| {
-            tenant_service_handler(r, handle_tenant_timeline_delete)
-        })
-        .post("/v1/tenant/:tenant_id/timeline", |r| {
-            tenant_service_handler(r, handle_tenant_timeline_create)
-        })
-        // Tenant detail GET passthrough to shard zero
-        .get("/v1/tenant/:tenant_id*", |r| {
-            tenant_service_handler(r, handle_tenant_timeline_passthrough)
-        })
-        // Timeline GET passthrough to shard zero.  Note that the `*` in the URL is a wildcard: any future
-        // timeline GET APIs will be implicitly included.
-        .get("/v1/tenant/:tenant_id/timeline*", |r| {
-            tenant_service_handler(r, handle_tenant_timeline_passthrough)
-        })
-        // Path aliases for tests_forward_compatibility
-        // TODO: remove these in future PR
         .post("/re-attach", |r| request_span(r, handle_re_attach))
         .post("/validate", |r| request_span(r, handle_validate))
+        .post("/attach-hook", |r| request_span(r, handle_attach_hook))
+        .post("/inspect", |r| request_span(r, handle_inspect))
+        .post("/node", |r| request_span(r, handle_node_register))
+        .put("/node/:node_id/config", |r| {
+            request_span(r, handle_node_configure)
+        })
+        .post("/tenant", |r| request_span(r, handle_tenant_create))
+        .post("/tenant/:tenant_id/timeline", |r| {
+            request_span(r, handle_tenant_timeline_create)
+        })
+        .get("/tenant/:tenant_id/locate", |r| {
+            request_span(r, handle_tenant_locate)
+        })
+        .put("/tenant/:tenant_shard_id/migrate", |r| {
+            request_span(r, handle_tenant_shard_migrate)
+        })
 }

control_plane/attachment_service/src/lib.rs

@@ -7,7 +7,6 @@ mod node;
 pub mod persistence;
 mod reconciler;
 mod scheduler;
-mod schema;
 pub mod service;
 mod tenant_state;
 
@@ -18,8 +17,6 @@ enum PlacementPolicy {
     /// Production-ready way to attach a tenant: one attached pageserver and
     /// some number of secondaries.
     Double(usize),
-    /// Do not attach to any pageservers
-    Detached,
 }
 
 #[derive(Ord, PartialOrd, Eq, PartialEq, Copy, Clone)]

control_plane/attachment_service/src/main.rs

@@ -12,9 +12,9 @@ use camino::Utf8PathBuf;
 use clap::Parser;
 use metrics::launch_timestamp::LaunchTimestamp;
 use std::sync::Arc;
-use tokio::signal::unix::SignalKind;
 use utils::auth::{JwtAuth, SwappableJwtAuth};
 use utils::logging::{self, LogFormat};
+use utils::signals::{ShutdownSignals, Signal};
 
 use utils::{project_build_tag, project_git_version, tcp_listener};
 
@@ -39,11 +39,7 @@ struct Cli {
 
     /// Path to the .json file to store state (will be created if it doesn't exist)
     #[arg(short, long)]
-    path: Option<Utf8PathBuf>,
-
-    /// URL to connect to postgres, like postgresql://localhost:1234/attachment_service
-    #[arg(long)]
-    database_url: String,
+    path: Utf8PathBuf,
 }
 
 #[tokio::main]
@@ -62,7 +58,7 @@ async fn main() -> anyhow::Result<()> {
         GIT_VERSION,
         launch_ts.to_string(),
         BUILD_TAG,
-        args.path.as_ref().unwrap_or(&Utf8PathBuf::from("<none>")),
+        args.path,
         args.listen
     );
 
@@ -70,10 +66,9 @@ async fn main() -> anyhow::Result<()> {
         jwt_token: args.jwt_token,
     };
 
-    let json_path = args.path;
-    let persistence = Arc::new(Persistence::new(args.database_url, json_path.clone()));
+    let persistence = Arc::new(Persistence::new(&args.path).await);
 
-    let service = Service::spawn(config, persistence.clone()).await?;
+    let service = Service::spawn(config, persistence).await?;
 
     let http_listener = tcp_listener::bind(args.listen)?;
 
@@ -86,31 +81,20 @@ async fn main() -> anyhow::Result<()> {
     let router = make_router(service, auth)
         .build()
         .map_err(|err| anyhow!(err))?;
-    let router_service = utils::http::RouterService::new(router).unwrap();
-    let server = hyper::Server::from_tcp(http_listener)?.serve(router_service);
+    let service = utils::http::RouterService::new(router).unwrap();
+    let server = hyper::Server::from_tcp(http_listener)?.serve(service);
 
     tracing::info!("Serving on {0}", args.listen);
 
     tokio::task::spawn(server);
 
-    // Wait until we receive a signal
-    let mut sigint = tokio::signal::unix::signal(SignalKind::interrupt())?;
-    let mut sigquit = tokio::signal::unix::signal(SignalKind::quit())?;
-    let mut sigterm = tokio::signal::unix::signal(SignalKind::terminate())?;
-    tokio::select! {
-        _ = sigint.recv() => {},
-        _ = sigterm.recv() => {},
-        _ = sigquit.recv() => {},
-    }
-    tracing::info!("Terminating on signal");
-
-    if json_path.is_some() {
-        // Write out a JSON dump on shutdown: this is used in compat tests to avoid passing
-        // full postgres dumps around.
-        if let Err(e) = persistence.write_tenants_json().await {
-            tracing::error!("Failed to write JSON on shutdown: {e}")
+    ShutdownSignals::handle(|signal| match signal {
+        Signal::Interrupt | Signal::Terminate | Signal::Quit => {
+            tracing::info!("Got {}. Terminating", signal.name());
+            // We're just a test helper: no graceful shutdown.
+            std::process::exit(0);
         }
-    }
+    })?;
 
-    std::process::exit(0);
+    Ok(())
 }

control_plane/attachment_service/src/node.rs

@@ -1,8 +1,6 @@
 use control_plane::attachment_service::{NodeAvailability, NodeSchedulingPolicy};
 use utils::id::NodeId;
 
-use crate::persistence::NodePersistence;
-
 #[derive(Clone)]
 pub(crate) struct Node {
     pub(crate) id: NodeId,
@@ -36,15 +34,4 @@ impl Node {
             NodeSchedulingPolicy::Pause => false,
         }
     }
-
-    pub(crate) fn to_persistent(&self) -> NodePersistence {
-        NodePersistence {
-            node_id: self.id.0 as i64,
-            scheduling_policy: self.scheduling.into(),
-            listen_http_addr: self.listen_http_addr.clone(),
-            listen_http_port: self.listen_http_port as i32,
-            listen_pg_addr: self.listen_pg_addr.clone(),
-            listen_pg_port: self.listen_pg_port as i32,
-        }
-    }
 }

control_plane/attachment_service/src/persistence.rs

@@ -1,295 +1,181 @@
-use std::collections::HashMap;
-use std::str::FromStr;
+use std::{collections::HashMap, str::FromStr};
 
-use camino::Utf8Path;
-use camino::Utf8PathBuf;
-use control_plane::attachment_service::{NodeAvailability, NodeSchedulingPolicy};
-use diesel::pg::PgConnection;
-use diesel::prelude::*;
-use diesel::Connection;
-use pageserver_api::models::TenantConfig;
-use pageserver_api::shard::{ShardCount, ShardNumber, TenantShardId};
+use camino::{Utf8Path, Utf8PathBuf};
+use control_plane::{
+    attachment_service::{NodeAvailability, NodeSchedulingPolicy},
+    local_env::LocalEnv,
+};
+use pageserver_api::{
+    models::TenantConfig,
+    shard::{ShardCount, ShardNumber, TenantShardId},
+};
+use postgres_connection::parse_host_port;
 use serde::{Deserialize, Serialize};
-use utils::generation::Generation;
-use utils::id::{NodeId, TenantId};
+use utils::{
+    generation::Generation,
+    id::{NodeId, TenantId},
+};
 
-use crate::node::Node;
-use crate::PlacementPolicy;
+use crate::{node::Node, PlacementPolicy};
 
-/// ## What do we store?
-///
-/// The attachment service does not store most of its state durably.
-///
-/// The essential things to store durably are:
-/// - generation numbers, as these must always advance monotonically to ensure data safety.
-/// - Tenant's PlacementPolicy and TenantConfig, as the source of truth for these is something external.
-/// - Node's scheduling policies, as the source of truth for these is something external.
-///
-/// Other things we store durably as an implementation detail:
-/// - Node's host/port: this could be avoided it we made nodes emit a self-registering heartbeat,
-///   but it is operationally simpler to make this service the authority for which nodes
-///   it talks to.
-///
-/// ## Performance/efficiency
-///
-/// The attachment service does not go via the database for most things: there are
-/// a couple of places where we must, and where efficiency matters:
-/// - Incrementing generation numbers: the Reconciler has to wait for this to complete
-///   before it can attach a tenant, so this acts as a bound on how fast things like
-///   failover can happen.
-/// - Pageserver re-attach: we will increment many shards' generations when this happens,
-///   so it is important to avoid e.g. issuing O(N) queries.
-///
-/// Database calls relating to nodes have low performance requirements, as they are very rarely
-/// updated, and reads of nodes are always from memory, not the database.  We only require that
-/// we can UPDATE a node's scheduling mode reasonably quickly to mark a bad node offline.
+/// Placeholder for storage.  This will be replaced with a database client.
 pub struct Persistence {
-    database_url: String,
-
-    // In test environments, we support loading+saving a JSON file.  This is temporary, for the benefit of
-    // test_compatibility.py, so that we don't have to commit to making the database contents fully backward/forward
-    // compatible just yet.
-    json_path: Option<Utf8PathBuf>,
+    state: std::sync::Mutex<PersistentState>,
 }
 
-/// Legacy format, for use in JSON compat objects in test environment
+// Top level state available to all HTTP handlers
 #[derive(Serialize, Deserialize)]
-struct JsonPersistence {
+struct PersistentState {
     tenants: HashMap<TenantShardId, TenantShardPersistence>,
+
+    #[serde(skip)]
+    path: Utf8PathBuf,
 }
 
-#[derive(thiserror::Error, Debug)]
-pub(crate) enum DatabaseError {
-    #[error(transparent)]
-    Query(#[from] diesel::result::Error),
-    #[error(transparent)]
-    Connection(#[from] diesel::result::ConnectionError),
-    #[error("Logical error: {0}")]
-    Logical(String),
+/// A convenience for serializing the state inside a sync lock, and then
+/// writing it to disk outside of the lock.  This will go away when switching
+/// to a database backend.
+struct PendingWrite {
+    bytes: Vec<u8>,
+    path: Utf8PathBuf,
 }
 
-pub(crate) type DatabaseResult<T> = Result<T, DatabaseError>;
+impl PendingWrite {
+    async fn commit(&self) -> anyhow::Result<()> {
+        tokio::fs::write(&self.path, &self.bytes).await?;
 
-impl Persistence {
-    pub fn new(database_url: String, json_path: Option<Utf8PathBuf>) -> Self {
-        Self {
-            database_url,
-            json_path,
+        Ok(())
+    }
+}
+
+impl PersistentState {
+    fn save(&self) -> PendingWrite {
+        PendingWrite {
+            bytes: serde_json::to_vec(self).expect("Serialization error"),
+            path: self.path.clone(),
         }
     }
 
-    /// Call the provided function in a tokio blocking thread, with a Diesel database connection.
-    async fn with_conn<F, R>(&self, func: F) -> DatabaseResult<R>
-    where
-        F: Fn(&mut PgConnection) -> DatabaseResult<R> + Send + 'static,
-        R: Send + 'static,
-    {
-        let database_url = self.database_url.clone();
-        tokio::task::spawn_blocking(move || -> DatabaseResult<R> {
-            // TODO: connection pooling, such as via diesel::r2d2
-            let mut conn = PgConnection::establish(&database_url)?;
-            func(&mut conn)
-        })
-        .await
-        .expect("Task panic")
-    }
+    async fn load(path: &Utf8Path) -> anyhow::Result<Self> {
+        let bytes = tokio::fs::read(path).await?;
+        let mut decoded = serde_json::from_slice::<Self>(&bytes)?;
+        decoded.path = path.to_owned();
 
-    /// When a node is first registered, persist it before using it for anything
-    pub(crate) async fn insert_node(&self, node: &Node) -> DatabaseResult<()> {
-        let np = node.to_persistent();
-        self.with_conn(move |conn| -> DatabaseResult<()> {
-            diesel::insert_into(crate::schema::nodes::table)
-                .values(&np)
-                .execute(conn)?;
-            Ok(())
-        })
-        .await
-    }
-
-    /// At startup, populate the list of nodes which our shards may be placed on
-    pub(crate) async fn list_nodes(&self) -> DatabaseResult<Vec<Node>> {
-        let nodes: Vec<Node> = self
-            .with_conn(move |conn| -> DatabaseResult<_> {
-                Ok(crate::schema::nodes::table
-                    .load::<NodePersistence>(conn)?
-                    .into_iter()
-                    .map(|n| Node {
-                        id: NodeId(n.node_id as u64),
-                        // At startup we consider a node offline until proven otherwise.
-                        availability: NodeAvailability::Offline,
-                        scheduling: NodeSchedulingPolicy::from_str(&n.scheduling_policy)
-                            .expect("Bad scheduling policy in DB"),
-                        listen_http_addr: n.listen_http_addr,
-                        listen_http_port: n.listen_http_port as u16,
-                        listen_pg_addr: n.listen_pg_addr,
-                        listen_pg_port: n.listen_pg_port as u16,
-                    })
-                    .collect::<Vec<Node>>())
-            })
-            .await?;
-
-        tracing::info!("list_nodes: loaded {} nodes", nodes.len());
-
-        Ok(nodes)
-    }
-
-    /// At startup, load the high level state for shards, such as their config + policy.  This will
-    /// be enriched at runtime with state discovered on pageservers.
-    pub(crate) async fn list_tenant_shards(&self) -> DatabaseResult<Vec<TenantShardPersistence>> {
-        let loaded = self
-            .with_conn(move |conn| -> DatabaseResult<_> {
-                Ok(crate::schema::tenant_shards::table.load::<TenantShardPersistence>(conn)?)
-            })
-            .await?;
-
-        if loaded.is_empty() {
-            if let Some(path) = &self.json_path {
-                if tokio::fs::try_exists(path)
-                    .await
-                    .map_err(|e| DatabaseError::Logical(format!("Error stat'ing JSON file: {e}")))?
-                {
-                    tracing::info!("Importing from legacy JSON format at {path}");
-                    return self.list_tenant_shards_json(path).await;
-                }
-            }
-        }
-        Ok(loaded)
-    }
-
-    /// Shim for automated compatibility tests: load tenants from a JSON file instead of database
-    pub(crate) async fn list_tenant_shards_json(
-        &self,
-        path: &Utf8Path,
-    ) -> DatabaseResult<Vec<TenantShardPersistence>> {
-        let bytes = tokio::fs::read(path)
-            .await
-            .map_err(|e| DatabaseError::Logical(format!("Failed to load JSON: {e}")))?;
-
-        let mut decoded = serde_json::from_slice::<JsonPersistence>(&bytes)
-            .map_err(|e| DatabaseError::Logical(format!("Deserialization error: {e}")))?;
         for (tenant_id, tenant) in &mut decoded.tenants {
             // Backward compat: an old attachments.json from before PR #6251, replace
             // empty strings with proper defaults.
             if tenant.tenant_id.is_empty() {
-                tenant.tenant_id = tenant_id.to_string();
-                tenant.config = serde_json::to_string(&TenantConfig::default())
-                    .map_err(|e| DatabaseError::Logical(format!("Serialization error: {e}")))?;
-                tenant.placement_policy = serde_json::to_string(&PlacementPolicy::default())
-                    .map_err(|e| DatabaseError::Logical(format!("Serialization error: {e}")))?;
+                tenant.tenant_id = format!("{}", tenant_id);
+                tenant.config = serde_json::to_string(&TenantConfig::default())?;
+                tenant.placement_policy = serde_json::to_string(&PlacementPolicy::default())?;
             }
         }
 
-        let tenants: Vec<TenantShardPersistence> = decoded.tenants.into_values().collect();
-
-        // Synchronize database with what is in the JSON file
-        self.insert_tenant_shards(tenants.clone()).await?;
-
-        Ok(tenants)
+        Ok(decoded)
     }
 
-    /// For use in testing environments, where we dump out JSON on shutdown.
-    pub async fn write_tenants_json(&self) -> anyhow::Result<()> {
-        let Some(path) = &self.json_path else {
-            anyhow::bail!("Cannot write JSON if path isn't set (test environment bug)");
-        };
-        tracing::info!("Writing state to {path}...");
-        let tenants = self.list_tenant_shards().await?;
-        let mut tenants_map = HashMap::new();
-        for tsp in tenants {
-            let tenant_shard_id = TenantShardId {
-                tenant_id: TenantId::from_str(tsp.tenant_id.as_str())?,
-                shard_number: ShardNumber(tsp.shard_number as u8),
-                shard_count: ShardCount(tsp.shard_count as u8),
-            };
-
-            tenants_map.insert(tenant_shard_id, tsp);
+    async fn load_or_new(path: &Utf8Path) -> Self {
+        match Self::load(path).await {
+            Ok(s) => {
+                tracing::info!("Loaded state file at {}", path);
+                s
+            }
+            Err(e)
+                if e.downcast_ref::<std::io::Error>()
+                    .map(|e| e.kind() == std::io::ErrorKind::NotFound)
+                    .unwrap_or(false) =>
+            {
+                tracing::info!("Will create state file at {}", path);
+                Self {
+                    tenants: HashMap::new(),
+                    path: path.to_owned(),
+                }
+            }
+            Err(e) => {
+                panic!("Failed to load state from '{}': {e:#} (maybe your .neon/ dir was written by an older version?)", path)
+            }
         }
-        let json = serde_json::to_string(&JsonPersistence {
-            tenants: tenants_map,
-        })?;
+    }
+}
 
-        tokio::fs::write(path, &json).await?;
-        tracing::info!("Wrote {} bytes to {path}...", json.len());
+impl Persistence {
+    pub async fn new(path: &Utf8Path) -> Self {
+        let state = PersistentState::load_or_new(path).await;
+        Self {
+            state: std::sync::Mutex::new(state),
+        }
+    }
 
+    /// When registering a node, persist it so that on next start we will be able to
+    /// iterate over known nodes to synchronize their tenant shard states with our observed state.
+    pub(crate) async fn insert_node(&self, _node: &Node) -> anyhow::Result<()> {
+        // TODO: node persitence will come with database backend
         Ok(())
     }
 
+    /// At startup, we populate the service's list of nodes, and use this list to call into
+    /// each node to do an initial reconciliation of the state of the world with our in-memory
+    /// observed state.
+    pub(crate) async fn list_nodes(&self) -> anyhow::Result<Vec<Node>> {
+        let env = LocalEnv::load_config()?;
+        // TODO: node persitence will come with database backend
+
+        // XXX hack: enable test_backward_compatibility to work by populating our list of
+        // nodes from LocalEnv when it is not present in persistent storage.  Otherwise at
+        // first startup in the compat test, we may have shards but no nodes.
+        let mut result = Vec::new();
+        tracing::info!(
+            "Loaded {} pageserver nodes from LocalEnv",
+            env.pageservers.len()
+        );
+        for ps_conf in env.pageservers {
+            let (pg_host, pg_port) =
+                parse_host_port(&ps_conf.listen_pg_addr).expect("Unable to parse listen_pg_addr");
+            let (http_host, http_port) = parse_host_port(&ps_conf.listen_http_addr)
+                .expect("Unable to parse listen_http_addr");
+            result.push(Node {
+                id: ps_conf.id,
+                listen_pg_addr: pg_host.to_string(),
+                listen_pg_port: pg_port.unwrap_or(5432),
+                listen_http_addr: http_host.to_string(),
+                listen_http_port: http_port.unwrap_or(80),
+                availability: NodeAvailability::Active,
+                scheduling: NodeSchedulingPolicy::Active,
+            });
+        }
+
+        Ok(result)
+    }
+
+    /// At startup, we populate our map of tenant shards from persistent storage.
+    pub(crate) async fn list_tenant_shards(&self) -> anyhow::Result<Vec<TenantShardPersistence>> {
+        let locked = self.state.lock().unwrap();
+        Ok(locked.tenants.values().cloned().collect())
+    }
+
     /// Tenants must be persisted before we schedule them for the first time.  This enables us
     /// to correctly retain generation monotonicity, and the externally provided placement policy & config.
     pub(crate) async fn insert_tenant_shards(
         &self,
         shards: Vec<TenantShardPersistence>,
-    ) -> DatabaseResult<()> {
-        use crate::schema::tenant_shards::dsl::*;
-        self.with_conn(move |conn| -> DatabaseResult<()> {
-            conn.transaction(|conn| -> QueryResult<()> {
-                for tenant in &shards {
-                    diesel::insert_into(tenant_shards)
-                        .values(tenant)
-                        .execute(conn)?;
-                }
-                Ok(())
-            })?;
-            Ok(())
-        })
-        .await
-    }
+    ) -> anyhow::Result<()> {
+        let write = {
+            let mut locked = self.state.lock().unwrap();
+            for shard in shards {
+                let tenant_shard_id = TenantShardId {
+                    tenant_id: TenantId::from_str(shard.tenant_id.as_str())?,
+                    shard_number: ShardNumber(shard.shard_number as u8),
+                    shard_count: ShardCount(shard.shard_count as u8),
+                };
 
-    /// Ordering: call this _after_ deleting the tenant on pageservers, but _before_ dropping state for
-    /// the tenant from memory on this server.
-    #[allow(unused)]
-    pub(crate) async fn delete_tenant(&self, del_tenant_id: TenantId) -> DatabaseResult<()> {
-        use crate::schema::tenant_shards::dsl::*;
-        self.with_conn(move |conn| -> DatabaseResult<()> {
-            diesel::delete(tenant_shards)
-                .filter(tenant_id.eq(del_tenant_id.to_string()))
-                .execute(conn)?;
+                locked.tenants.insert(tenant_shard_id, shard);
+            }
+            locked.save()
+        };
 
-            Ok(())
-        })
-        .await
-    }
+        write.commit().await?;
 
-    /// When a tenant invokes the /re-attach API, this function is responsible for doing an efficient
-    /// batched increment of the generations of all tenants whose generation_pageserver is equal to
-    /// the node that called /re-attach.
-    #[tracing::instrument(skip_all, fields(node_id))]
-    pub(crate) async fn re_attach(
-        &self,
-        node_id: NodeId,
-    ) -> DatabaseResult<HashMap<TenantShardId, Generation>> {
-        use crate::schema::tenant_shards::dsl::*;
-        let updated = self
-            .with_conn(move |conn| {
-                let rows_updated = diesel::update(tenant_shards)
-                    .filter(generation_pageserver.eq(node_id.0 as i64))
-                    .set(generation.eq(generation + 1))
-                    .execute(conn)?;
-
-                tracing::info!("Incremented {} tenants' generations", rows_updated);
-
-                // TODO: UPDATE+SELECT in one query
-
-                let updated = tenant_shards
-                    .filter(generation_pageserver.eq(node_id.0 as i64))
-                    .select(TenantShardPersistence::as_select())
-                    .load(conn)?;
-                Ok(updated)
-            })
-            .await?;
-
-        let mut result = HashMap::new();
-        for tsp in updated {
-            let tenant_shard_id = TenantShardId {
-                tenant_id: TenantId::from_str(tsp.tenant_id.as_str())
-                    .map_err(|e| DatabaseError::Logical(format!("Malformed tenant id: {e}")))?,
-                shard_number: ShardNumber(tsp.shard_number as u8),
-                shard_count: ShardCount(tsp.shard_count as u8),
-            };
-            result.insert(tenant_shard_id, Generation::new(tsp.generation as u32));
-        }
-
-        Ok(result)
+        Ok(())
     }
 
     /// Reconciler calls this immediately before attaching to a new pageserver, to acquire a unique, monotonically
@@ -298,48 +184,49 @@ impl Persistence {
     pub(crate) async fn increment_generation(
         &self,
         tenant_shard_id: TenantShardId,
-        node_id: NodeId,
+        node_id: Option<NodeId>,
     ) -> anyhow::Result<Generation> {
-        use crate::schema::tenant_shards::dsl::*;
-        let updated = self
-            .with_conn(move |conn| {
-                let updated = diesel::update(tenant_shards)
-                    .filter(tenant_id.eq(tenant_shard_id.tenant_id.to_string()))
-                    .filter(shard_number.eq(tenant_shard_id.shard_number.0 as i32))
-                    .filter(shard_count.eq(tenant_shard_id.shard_count.0 as i32))
-                    .set((
-                        generation.eq(generation + 1),
-                        generation_pageserver.eq(node_id.0 as i64),
-                    ))
-                    // TODO: only returning() the generation column
-                    .returning(TenantShardPersistence::as_returning())
-                    .get_result(conn)?;
+        let (write, gen) = {
+            let mut locked = self.state.lock().unwrap();
+            let Some(shard) = locked.tenants.get_mut(&tenant_shard_id) else {
+                anyhow::bail!("Tried to increment generation of unknown shard");
+            };
 
-                Ok(updated)
-            })
-            .await?;
+            // If we're called with a None pageserver, we need only update the generation
+            // record to disassociate it with this pageserver, not actually increment the number, as
+            // the increment is guaranteed to happen the next time this tenant is attached.
+            if node_id.is_some() {
+                shard.generation += 1;
+            }
 
-        Ok(Generation::new(updated.generation as u32))
+            shard.generation_pageserver = node_id;
+            let gen = Generation::new(shard.generation);
+            (locked.save(), gen)
+        };
+
+        write.commit().await?;
+        Ok(gen)
     }
 
-    pub(crate) async fn detach(&self, tenant_shard_id: TenantShardId) -> anyhow::Result<()> {
-        use crate::schema::tenant_shards::dsl::*;
-        self.with_conn(move |conn| {
-            let updated = diesel::update(tenant_shards)
-                .filter(tenant_id.eq(tenant_shard_id.tenant_id.to_string()))
-                .filter(shard_number.eq(tenant_shard_id.shard_number.0 as i32))
-                .filter(shard_count.eq(tenant_shard_id.shard_count.0 as i32))
-                .set((
-                    generation_pageserver.eq(i64::MAX),
-                    placement_policy.eq(serde_json::to_string(&PlacementPolicy::Detached).unwrap()),
-                ))
-                .execute(conn)?;
+    pub(crate) async fn re_attach(
+        &self,
+        node_id: NodeId,
+    ) -> anyhow::Result<HashMap<TenantShardId, Generation>> {
+        let (write, result) = {
+            let mut result = HashMap::new();
+            let mut locked = self.state.lock().unwrap();
+            for (tenant_shard_id, shard) in locked.tenants.iter_mut() {
+                if shard.generation_pageserver == Some(node_id) {
+                    shard.generation += 1;
+                    result.insert(*tenant_shard_id, Generation::new(shard.generation));
+                }
+            }
 
-            Ok(updated)
-        })
-        .await?;
+            (locked.save(), result)
+        };
 
-        Ok(())
+        write.commit().await?;
+        Ok(result)
     }
 
     // TODO: when we start shard splitting, we must durably mark the tenant so that
@@ -359,8 +246,7 @@ impl Persistence {
 }
 
 /// Parts of [`crate::tenant_state::TenantState`] that are stored durably
-#[derive(Queryable, Selectable, Insertable, Serialize, Deserialize, Clone)]
-#[diesel(table_name = crate::schema::tenant_shards)]
+#[derive(Serialize, Deserialize, Clone)]
 pub(crate) struct TenantShardPersistence {
     #[serde(default)]
     pub(crate) tenant_id: String,
@@ -371,28 +257,16 @@ pub(crate) struct TenantShardPersistence {
     #[serde(default)]
     pub(crate) shard_stripe_size: i32,
 
-    // Latest generation number: next time we attach, increment this
-    // and use the incremented number when attaching
-    pub(crate) generation: i32,
-
     // Currently attached pageserver
     #[serde(rename = "pageserver")]
-    pub(crate) generation_pageserver: i64,
+    pub(crate) generation_pageserver: Option<NodeId>,
+
+    // Latest generation number: next time we attach, increment this
+    // and use the incremented number when attaching
+    pub(crate) generation: u32,
 
     #[serde(default)]
     pub(crate) placement_policy: String,
     #[serde(default)]
     pub(crate) config: String,
 }
-
-/// Parts of [`crate::node::Node`] that are stored durably
-#[derive(Serialize, Deserialize, Queryable, Selectable, Insertable)]
-#[diesel(table_name = crate::schema::nodes)]
-pub(crate) struct NodePersistence {
-    pub(crate) node_id: i64,
-    pub(crate) scheduling_policy: String,
-    pub(crate) listen_http_addr: String,
-    pub(crate) listen_http_port: i32,
-    pub(crate) listen_pg_addr: String,
-    pub(crate) listen_pg_port: i32,
-}

control_plane/attachment_service/src/reconciler.rs

@@ -296,7 +296,7 @@ impl Reconciler {
         // Increment generation before attaching to new pageserver
         self.generation = self
             .persistence
-            .increment_generation(self.tenant_shard_id, dest_ps_id)
+            .increment_generation(self.tenant_shard_id, Some(dest_ps_id))
             .await?;
 
         let dest_conf = build_location_config(
@@ -395,7 +395,7 @@ impl Reconciler {
                     // as locations with unknown (None) observed state.
                     self.generation = self
                         .persistence
-                        .increment_generation(self.tenant_shard_id, node_id)
+                        .increment_generation(self.tenant_shard_id, Some(node_id))
                         .await?;
                     wanted_conf.generation = self.generation.into();
                     tracing::info!("Observed configuration requires update.");

control_plane/attachment_service/src/schema.rs

@@ -1,27 +0,0 @@
-// @generated automatically by Diesel CLI.
-
-diesel::table! {
-    nodes (node_id) {
-        node_id -> Int8,
-        scheduling_policy -> Varchar,
-        listen_http_addr -> Varchar,
-        listen_http_port -> Int4,
-        listen_pg_addr -> Varchar,
-        listen_pg_port -> Int4,
-    }
-}
-
-diesel::table! {
-    tenant_shards (tenant_id, shard_number, shard_count) {
-        tenant_id -> Varchar,
-        shard_number -> Int4,
-        shard_count -> Int4,
-        shard_stripe_size -> Int4,
-        generation -> Int4,
-        generation_pageserver -> Int8,
-        placement_policy -> Varchar,
-        config -> Text,
-    }
-}
-
-diesel::allow_tables_to_appear_in_same_query!(nodes, tenant_shards,);

control_plane/attachment_service/src/service.rs

@@ -11,7 +11,6 @@ use control_plane::attachment_service::{
     TenantCreateResponseShard, TenantLocateResponse, TenantLocateResponseShard,
     TenantShardMigrateRequest, TenantShardMigrateResponse,
 };
-use diesel::result::DatabaseErrorKind;
 use hyper::StatusCode;
 use pageserver_api::{
     control_api::{
@@ -21,24 +20,22 @@ use pageserver_api::{
     models,
     models::{
         LocationConfig, LocationConfigMode, ShardParameters, TenantConfig, TenantCreateRequest,
-        TenantLocationConfigRequest, TenantLocationConfigResponse, TenantShardLocation,
         TimelineCreateRequest, TimelineInfo,
     },
     shard::{ShardCount, ShardIdentity, ShardNumber, ShardStripeSize, TenantShardId},
 };
 use pageserver_client::mgmt_api;
 use utils::{
-    completion::Barrier,
     generation::Generation,
     http::error::ApiError,
-    id::{NodeId, TenantId, TimelineId},
+    id::{NodeId, TenantId},
     seqwait::SeqWait,
 };
 
 use crate::{
     compute_hook::ComputeHook,
     node::Node,
-    persistence::{DatabaseError, NodePersistence, Persistence, TenantShardPersistence},
+    persistence::{Persistence, TenantShardPersistence},
     scheduler::Scheduler,
     tenant_state::{
         IntentState, ObservedState, ObservedStateLocation, ReconcileResult, ReconcileWaitError,
@@ -49,10 +46,6 @@ use crate::{
 
 const RECONCILE_TIMEOUT: Duration = Duration::from_secs(30);
 
-/// How long [`Service::startup_reconcile`] is allowed to take before it should give
-/// up on unresponsive pageservers and proceed.
-pub(crate) const STARTUP_RECONCILE_TIMEOUT: Duration = Duration::from_secs(30);
-
 // Top level state available to all HTTP handlers
 struct ServiceState {
     tenants: BTreeMap<TenantShardId, TenantState>,
@@ -86,27 +79,10 @@ pub struct Config {
     pub jwt_token: Option<String>,
 }
 
-impl From<DatabaseError> for ApiError {
-    fn from(err: DatabaseError) -> ApiError {
-        match err {
-            DatabaseError::Query(e) => ApiError::InternalServerError(e.into()),
-            // FIXME: ApiError doesn't have an Unavailable variant, but ShuttingDown maps to 503.
-            DatabaseError::Connection(_e) => ApiError::ShuttingDown,
-            DatabaseError::Logical(reason) => {
-                ApiError::InternalServerError(anyhow::anyhow!(reason))
-            }
-        }
-    }
-}
-
 pub struct Service {
     inner: Arc<std::sync::RwLock<ServiceState>>,
     config: Config,
     persistence: Arc<Persistence>,
-
-    /// This waits for initial reconciliation with pageservers to complete.  Until this barrier
-    /// passes, it isn't safe to do any actions that mutate tenants.
-    pub(crate) startup_complete: Barrier,
 }
 
 impl From<ReconcileWaitError> for ApiError {
@@ -120,32 +96,77 @@ impl From<ReconcileWaitError> for ApiError {
 }
 
 impl Service {
-    pub fn get_config(&self) -> &Config {
-        &self.config
-    }
+    pub async fn spawn(config: Config, persistence: Arc<Persistence>) -> anyhow::Result<Arc<Self>> {
+        let (result_tx, mut result_rx) = tokio::sync::mpsc::unbounded_channel();
+
+        tracing::info!("Loading nodes from database...");
+        let mut nodes = persistence.list_nodes().await?;
+        tracing::info!("Loaded {} nodes from database.", nodes.len());
+
+        tracing::info!("Loading shards from database...");
+        let tenant_shard_persistence = persistence.list_tenant_shards().await?;
+        tracing::info!(
+            "Loaded {} shards from database.",
+            tenant_shard_persistence.len()
+        );
+
+        let mut tenants = BTreeMap::new();
+
+        for tsp in tenant_shard_persistence {
+            let tenant_shard_id = TenantShardId {
+                tenant_id: TenantId::from_str(tsp.tenant_id.as_str())?,
+                shard_number: ShardNumber(tsp.shard_number as u8),
+                shard_count: ShardCount(tsp.shard_count as u8),
+            };
+            let shard_identity = if tsp.shard_count == 0 {
+                ShardIdentity::unsharded()
+            } else {
+                ShardIdentity::new(
+                    ShardNumber(tsp.shard_number as u8),
+                    ShardCount(tsp.shard_count as u8),
+                    ShardStripeSize(tsp.shard_stripe_size as u32),
+                )?
+            };
+            let new_tenant = TenantState {
+                tenant_shard_id,
+                shard: shard_identity,
+                sequence: Sequence::initial(),
+                // Note that we load generation, but don't care about generation_pageserver.  We will either end up finding
+                // our existing attached location and it will match generation_pageserver, or we will attach somewhere new
+                // and update generation_pageserver in the process.
+                generation: Generation::new(tsp.generation),
+                policy: serde_json::from_str(&tsp.placement_policy).unwrap(),
+                intent: IntentState::new(),
+                observed: ObservedState::new(),
+                config: serde_json::from_str(&tsp.config).unwrap(),
+                reconciler: None,
+                waiter: Arc::new(SeqWait::new(Sequence::initial())),
+                error_waiter: Arc::new(SeqWait::new(Sequence::initial())),
+                last_error: Arc::default(),
+            };
+
+            tenants.insert(tenant_shard_id, new_tenant);
+        }
 
-    /// TODO: don't allow other API calls until this is done, don't start doing any background housekeeping
-    /// until this is done.
-    async fn startup_reconcile(&self) {
         // For all tenant shards, a vector of observed states on nodes (where None means
         // indeterminate, same as in [`ObservedStateLocation`])
         let mut observed = HashMap::new();
 
-        let nodes = {
-            let locked = self.inner.read().unwrap();
-            locked.nodes.clone()
-        };
-
         // TODO: issue these requests concurrently
-        for node in nodes.values() {
-            let client = mgmt_api::Client::new(node.base_url(), self.config.jwt_token.as_deref());
+        for node in &mut nodes {
+            let client = mgmt_api::Client::new(node.base_url(), config.jwt_token.as_deref());
 
             tracing::info!("Scanning shards on node {}...", node.id);
             match client.list_location_config().await {
                 Err(e) => {
                     tracing::warn!("Could not contact pageserver {} ({e})", node.id);
-                    // TODO: be more tolerant, apply a generous 5-10 second timeout with retries, in case
-                    // pageserver is being restarted at the same time as we are
+                    // TODO: be more tolerant, apply a generous 5-10 second timeout
+                    // TODO: setting a node to Offline is a dramatic thing to do, and can
+                    // prevent neon_local from starting up (it starts this service before
+                    // any pageservers are  running).  It may make sense to give nodes
+                    // a Pending state to accomodate this situation, and allow (but deprioritize)
+                    // scheduling on Pending nodes.
+                    //node.availability = NodeAvailability::Offline;
                 }
                 Ok(listing) => {
                     tracing::info!(
@@ -153,6 +174,7 @@ impl Service {
                         listing.tenant_shards.len(),
                         node.id
                     );
+                    node.availability = NodeAvailability::Active;
 
                     for (tenant_shard_id, conf_opt) in listing.tenant_shards {
                         observed.insert(tenant_shard_id, (node.id, conf_opt));
@@ -164,46 +186,41 @@ impl Service {
         let mut cleanup = Vec::new();
 
         // Populate intent and observed states for all tenants, based on reported state on pageservers
-        let shard_count = {
-            let mut locked = self.inner.write().unwrap();
-            for (tenant_shard_id, (node_id, observed_loc)) in observed {
-                let Some(tenant_state) = locked.tenants.get_mut(&tenant_shard_id) else {
-                    cleanup.push((tenant_shard_id, node_id));
-                    continue;
-                };
+        for (tenant_shard_id, (node_id, observed_loc)) in observed {
+            let Some(tenant_state) = tenants.get_mut(&tenant_shard_id) else {
+                cleanup.push((tenant_shard_id, node_id));
+                continue;
+            };
 
-                tenant_state
-                    .observed
-                    .locations
-                    .insert(node_id, ObservedStateLocation { conf: observed_loc });
+            tenant_state
+                .observed
+                .locations
+                .insert(node_id, ObservedStateLocation { conf: observed_loc });
+        }
+
+        // State of nodes is now frozen, transform to a HashMap.
+        let mut nodes: HashMap<NodeId, Node> = nodes.into_iter().map(|n| (n.id, n)).collect();
+
+        // Populate each tenant's intent state
+        let mut scheduler = Scheduler::new(&tenants, &nodes);
+        for (tenant_shard_id, tenant_state) in tenants.iter_mut() {
+            tenant_state.intent_from_observed();
+            if let Err(e) = tenant_state.schedule(&mut scheduler) {
+                // Non-fatal error: we are unable to properly schedule the tenant, perhaps because
+                // not enough pageservers are available.  The tenant may well still be available
+                // to clients.
+                tracing::error!("Failed to schedule tenant {tenant_shard_id} at startup: {e}");
             }
-
-            // Populate each tenant's intent state
-            let mut scheduler = Scheduler::new(&locked.tenants, &nodes);
-            for (tenant_shard_id, tenant_state) in locked.tenants.iter_mut() {
-                tenant_state.intent_from_observed();
-                if let Err(e) = tenant_state.schedule(&mut scheduler) {
-                    // Non-fatal error: we are unable to properly schedule the tenant, perhaps because
-                    // not enough pageservers are available.  The tenant may well still be available
-                    // to clients.
-                    tracing::error!("Failed to schedule tenant {tenant_shard_id} at startup: {e}");
-                }
-            }
-
-            locked.tenants.len()
-        };
-
-        // TODO: if any tenant's intent now differs from its loaded generation_pageserver, we should clear that
-        // generation_pageserver in the database.
+        }
 
         // Clean up any tenants that were found on pageservers but are not known to us.
         for (tenant_shard_id, node_id) in cleanup {
             // A node reported a tenant_shard_id which is unknown to us: detach it.
             let node = nodes
-                .get(&node_id)
+                .get_mut(&node_id)
                 .expect("Always exists: only known nodes are scanned");
 
-            let client = mgmt_api::Client::new(node.base_url(), self.config.jwt_token.as_deref());
+            let client = mgmt_api::Client::new(node.base_url(), config.jwt_token.as_deref());
             match client
                 .location_config(
                     tenant_shard_id,
@@ -235,80 +252,13 @@ impl Service {
             }
         }
 
-        // Finally, now that the service is up and running, launch reconcile operations for any tenants
-        // which require it: under normal circumstances this should only include tenants that were in some
-        // transient state before we restarted.
-        let reconcile_tasks = self.reconcile_all();
-        tracing::info!("Startup complete, spawned {reconcile_tasks} reconciliation tasks ({shard_count} shards total)");
-    }
-
-    pub async fn spawn(config: Config, persistence: Arc<Persistence>) -> anyhow::Result<Arc<Self>> {
-        let (result_tx, mut result_rx) = tokio::sync::mpsc::unbounded_channel();
-
-        tracing::info!("Loading nodes from database...");
-        let nodes = persistence.list_nodes().await?;
-        let nodes: HashMap<NodeId, Node> = nodes.into_iter().map(|n| (n.id, n)).collect();
-        tracing::info!("Loaded {} nodes from database.", nodes.len());
-
-        tracing::info!("Loading shards from database...");
-        let tenant_shard_persistence = persistence.list_tenant_shards().await?;
-        tracing::info!(
-            "Loaded {} shards from database.",
-            tenant_shard_persistence.len()
-        );
-
-        let mut tenants = BTreeMap::new();
-
-        for tsp in tenant_shard_persistence {
-            let tenant_shard_id = TenantShardId {
-                tenant_id: TenantId::from_str(tsp.tenant_id.as_str())?,
-                shard_number: ShardNumber(tsp.shard_number as u8),
-                shard_count: ShardCount(tsp.shard_count as u8),
-            };
-            let shard_identity = if tsp.shard_count == 0 {
-                ShardIdentity::unsharded()
-            } else {
-                ShardIdentity::new(
-                    ShardNumber(tsp.shard_number as u8),
-                    ShardCount(tsp.shard_count as u8),
-                    ShardStripeSize(tsp.shard_stripe_size as u32),
-                )?
-            };
-
-            // We will populate intent properly later in [`Self::startup_reconcile`], initially populate
-            // it with what we can infer: the node for which a generation was most recently issued.
-            let mut intent = IntentState::new();
-            if tsp.generation_pageserver != i64::MAX {
-                intent.attached = Some(NodeId(tsp.generation_pageserver as u64))
-            }
-
-            let new_tenant = TenantState {
-                tenant_shard_id,
-                shard: shard_identity,
-                sequence: Sequence::initial(),
-                generation: Generation::new(tsp.generation as u32),
-                policy: serde_json::from_str(&tsp.placement_policy).unwrap(),
-                intent,
-                observed: ObservedState::new(),
-                config: serde_json::from_str(&tsp.config).unwrap(),
-                reconciler: None,
-                waiter: Arc::new(SeqWait::new(Sequence::initial())),
-                error_waiter: Arc::new(SeqWait::new(Sequence::initial())),
-                last_error: Arc::default(),
-            };
-
-            tenants.insert(tenant_shard_id, new_tenant);
-        }
-
-        let (startup_completion, startup_complete) = utils::completion::channel();
-
+        let shard_count = tenants.len();
         let this = Arc::new(Self {
             inner: Arc::new(std::sync::RwLock::new(ServiceState::new(
                 result_tx, nodes, tenants,
             ))),
             config,
             persistence,
-            startup_complete,
         });
 
         let result_task_this = this.clone();
@@ -366,13 +316,11 @@ impl Service {
             }
         });
 
-        let startup_reconcile_this = this.clone();
-        tokio::task::spawn(async move {
-            // Block the [`Service::startup_complete`] barrier until we're done
-            let _completion = startup_completion;
-
-            startup_reconcile_this.startup_reconcile().await
-        });
+        // Finally, now that the service is up and running, launch reconcile operations for any tenants
+        // which require it: under normal circumstances this should only include tenants that were in some
+        // transient state before we restarted.
+        let reconcile_tasks = this.reconcile_all();
+        tracing::info!("Startup complete, spawned {reconcile_tasks} reconciliation tasks ({shard_count} shards total)");
 
         Ok(this)
     }
@@ -388,6 +336,7 @@ impl Service {
             let locked = self.inner.write().unwrap();
             !locked.tenants.contains_key(&attach_req.tenant_shard_id)
         };
+
         if insert {
             let tsp = TenantShardPersistence {
                 tenant_id: attach_req.tenant_shard_id.tenant_id.to_string(),
@@ -395,49 +344,31 @@ impl Service {
                 shard_count: attach_req.tenant_shard_id.shard_count.0 as i32,
                 shard_stripe_size: 0,
                 generation: 0,
-                generation_pageserver: i64::MAX,
+                generation_pageserver: None,
                 placement_policy: serde_json::to_string(&PlacementPolicy::default()).unwrap(),
                 config: serde_json::to_string(&TenantConfig::default()).unwrap(),
             };
 
-            match self.persistence.insert_tenant_shards(vec![tsp]).await {
-                Err(e) => match e {
-                    DatabaseError::Query(diesel::result::Error::DatabaseError(
-                        DatabaseErrorKind::UniqueViolation,
-                        _,
-                    )) => {
-                        tracing::info!(
-                            "Raced with another request to insert tenant {}",
-                            attach_req.tenant_shard_id
-                        )
-                    }
-                    _ => return Err(e.into()),
-                },
-                Ok(()) => {
-                    tracing::info!("Inserted shard {} in database", attach_req.tenant_shard_id);
+            self.persistence.insert_tenant_shards(vec![tsp]).await?;
 
-                    let mut locked = self.inner.write().unwrap();
-                    locked.tenants.insert(
-                        attach_req.tenant_shard_id,
-                        TenantState::new(
-                            attach_req.tenant_shard_id,
-                            ShardIdentity::unsharded(),
-                            PlacementPolicy::Single,
-                        ),
-                    );
-                    tracing::info!("Inserted shard {} in memory", attach_req.tenant_shard_id);
-                }
-            }
+            let mut locked = self.inner.write().unwrap();
+            locked.tenants.insert(
+                attach_req.tenant_shard_id,
+                TenantState::new(
+                    attach_req.tenant_shard_id,
+                    ShardIdentity::unsharded(),
+                    PlacementPolicy::Single,
+                ),
+            );
         }
 
-        let new_generation = if let Some(req_node_id) = attach_req.node_id {
+        let new_generation = if attach_req.node_id.is_some() {
             Some(
                 self.persistence
-                    .increment_generation(attach_req.tenant_shard_id, req_node_id)
+                    .increment_generation(attach_req.tenant_shard_id, attach_req.node_id)
                     .await?,
             )
         } else {
-            self.persistence.detach(attach_req.tenant_shard_id).await?;
             None
         };
 
@@ -449,11 +380,6 @@ impl Service {
 
         if let Some(new_generation) = new_generation {
             tenant_state.generation = new_generation;
-        } else {
-            // This is a detach notification.  We must update placement policy to avoid re-attaching
-            // during background scheduling/reconciliation, or during attachment service restart.
-            assert!(attach_req.node_id.is_none());
-            tenant_state.policy = PlacementPolicy::Detached;
         }
 
         if let Some(attaching_pageserver) = attach_req.node_id.as_ref() {
@@ -481,7 +407,6 @@ impl Service {
             "attach_hook: tenant {} set generation {:?}, pageserver {}",
             attach_req.tenant_shard_id,
             tenant_state.generation,
-            // TODO: this is an odd number of 0xf's
             attach_req.node_id.unwrap_or(utils::id::NodeId(0xfffffff))
         );
 
@@ -574,14 +499,6 @@ impl Service {
                     id: req_tenant.id,
                     valid,
                 });
-            } else {
-                // After tenant deletion, we may approve any validation.  This avoids
-                // spurious warnings on the pageserver if it has pending LSN updates
-                // at the point a deletion happens.
-                response.tenants.push(ValidateResponseTenant {
-                    id: req_tenant.id,
-                    valid: true,
-                });
             }
         }
         response
@@ -636,8 +553,8 @@ impl Service {
                 shard_number: tenant_shard_id.shard_number.0 as i32,
                 shard_count: tenant_shard_id.shard_count.0 as i32,
                 shard_stripe_size: create_req.shard_parameters.stripe_size.0 as i32,
-                generation: create_req.generation.map(|g| g as i32).unwrap_or(0),
-                generation_pageserver: i64::MAX,
+                generation: 0,
+                generation_pageserver: None,
                 placement_policy: serde_json::to_string(&placement_policy).unwrap(),
                 config: serde_json::to_string(&create_req.config).unwrap(),
             })
@@ -678,7 +595,6 @@ impl Service {
                         })?;
 
                         response_shards.push(TenantCreateResponseShard {
-                            shard_id: tenant_shard_id,
                             node_id: entry
                                 .get()
                                 .intent
@@ -711,7 +627,6 @@ impl Service {
                         })?;
 
                         response_shards.push(TenantCreateResponseShard {
-                            shard_id: tenant_shard_id,
                             node_id: state
                                 .intent
                                 .attached
@@ -745,257 +660,14 @@ impl Service {
             (waiters, response_shards)
         };
 
-        self.await_waiters(waiters).await?;
-
-        Ok(TenantCreateResponse {
-            shards: response_shards,
-        })
-    }
-
-    /// Helper for functions that reconcile a number of shards, and would like to do a timeout-bounded
-    /// wait for reconciliation to complete before responding.
-    async fn await_waiters(
-        &self,
-        waiters: Vec<ReconcilerWaiter>,
-    ) -> Result<(), ReconcileWaitError> {
-        let deadline = Instant::now().checked_add(Duration::from_secs(30)).unwrap();
+        let deadline = Instant::now().checked_add(Duration::from_secs(5)).unwrap();
         for waiter in waiters {
             let timeout = deadline.duration_since(Instant::now());
             waiter.wait_timeout(timeout).await?;
         }
-
-        Ok(())
-    }
-
-    /// This API is used by the cloud control plane to do coarse-grained control of tenants:
-    /// - Call with mode Attached* to upsert the tenant.
-    /// - Call with mode Detached to switch to PolicyMode::Detached
-    ///
-    /// In future, calling with mode Secondary may switch to a detach-lite mode in which a tenant only has
-    /// secondary locations.
-    pub(crate) async fn tenant_location_config(
-        &self,
-        tenant_id: TenantId,
-        req: TenantLocationConfigRequest,
-    ) -> Result<TenantLocationConfigResponse, ApiError> {
-        if req.tenant_id.shard_count.0 > 1 {
-            return Err(ApiError::BadRequest(anyhow::anyhow!(
-                "This API is for importing single-sharded or unsharded tenants"
-            )));
-        }
-
-        let mut waiters = Vec::new();
-        let mut result = TenantLocationConfigResponse { shards: Vec::new() };
-        let maybe_create = {
-            let mut locked = self.inner.write().unwrap();
-            let result_tx = locked.result_tx.clone();
-            let compute_hook = locked.compute_hook.clone();
-            let pageservers = locked.nodes.clone();
-
-            let mut scheduler = Scheduler::new(&locked.tenants, &locked.nodes);
-
-            // Maybe we have existing shards
-            let mut create = true;
-            for (shard_id, shard) in locked
-                .tenants
-                .range_mut(TenantShardId::tenant_range(tenant_id))
-            {
-                // Saw an existing shard: this is not a creation
-                create = false;
-
-                // Note that for existing tenants we do _not_ respect the generation in the request: this is likely
-                // to be stale.  Once a tenant is created in this service, our view of generation is authoritative, and
-                // callers' generations may be ignored.  This represents a one-way migration of tenants from the outer
-                // cloud control plane into this service.
-
-                // Use location config mode as an indicator of policy: if they ask for
-                // attached we go to default HA attached mode.  If they ask for secondary
-                // we go to secondary-only mode.  If they ask for detached we detach.
-                match req.config.mode {
-                    LocationConfigMode::Detached => {
-                        shard.policy = PlacementPolicy::Detached;
-                    }
-                    LocationConfigMode::Secondary => {
-                        // TODO: implement secondary-only mode.
-                        todo!();
-                    }
-                    LocationConfigMode::AttachedMulti
-                    | LocationConfigMode::AttachedSingle
-                    | LocationConfigMode::AttachedStale => {
-                        // TODO: persistence for changes in policy
-                        if pageservers.len() > 1 {
-                            shard.policy = PlacementPolicy::Double(1)
-                        } else {
-                            // Convenience for dev/test: if we just have one pageserver, import
-                            // tenants into Single mode so that scheduling will succeed.
-                            shard.policy = PlacementPolicy::Single
-                        }
-                    }
-                }
-
-                shard.schedule(&mut scheduler)?;
-
-                let maybe_waiter = shard.maybe_reconcile(
-                    result_tx.clone(),
-                    &pageservers,
-                    &compute_hook,
-                    &self.config,
-                    &self.persistence,
-                );
-                if let Some(waiter) = maybe_waiter {
-                    waiters.push(waiter);
-                }
-
-                if let Some(node_id) = shard.intent.attached {
-                    result.shards.push(TenantShardLocation {
-                        shard_id: *shard_id,
-                        node_id,
-                    })
-                }
-            }
-
-            if create {
-                // Validate request mode
-                match req.config.mode {
-                    LocationConfigMode::Detached | LocationConfigMode::Secondary => {
-                        // When using this API to onboard an existing tenant to this service, it must start in
-                        // an attached state, because we need the request to come with a generation
-                        return Err(ApiError::BadRequest(anyhow::anyhow!(
-                            "Imported tenant must be in attached mode"
-                        )));
-                    }
-
-                    LocationConfigMode::AttachedMulti
-                    | LocationConfigMode::AttachedSingle
-                    | LocationConfigMode::AttachedStale => {
-                        // Pass
-                    }
-                }
-
-                // Validate request generation
-                let Some(generation) = req.config.generation else {
-                    // We can only import attached tenants, because we need the request to come with a generation
-                    return Err(ApiError::BadRequest(anyhow::anyhow!(
-                        "Generation is mandatory when importing tenant"
-                    )));
-                };
-
-                // Synthesize a creation request
-                Some(TenantCreateRequest {
-                    new_tenant_id: TenantShardId::unsharded(tenant_id),
-                    generation: Some(generation),
-                    shard_parameters: ShardParameters {
-                        // Must preserve the incoming shard_count do distinguish unsharded (0)
-                        // from single-sharded (1): this distinction appears in the S3 keys of the tenant.
-                        count: req.tenant_id.shard_count,
-                        // We only import un-sharded or single-sharded tenants, so stripe
-                        // size can be made up arbitrarily here.
-                        stripe_size: ShardParameters::DEFAULT_STRIPE_SIZE,
-                    },
-                    config: req.config.tenant_conf,
-                })
-            } else {
-                None
-            }
-        };
-
-        if let Some(create_req) = maybe_create {
-            let create_resp = self.tenant_create(create_req).await?;
-            result.shards = create_resp
-                .shards
-                .into_iter()
-                .map(|s| TenantShardLocation {
-                    node_id: s.node_id,
-                    shard_id: s.shard_id,
-                })
-                .collect();
-        } else {
-            // This was an update, wait for reconciliation
-            self.await_waiters(waiters).await?;
-        }
-
-        Ok(result)
-    }
-
-    pub(crate) async fn tenant_delete(&self, tenant_id: TenantId) -> Result<StatusCode, ApiError> {
-        // TODO: refactor into helper
-        let targets = {
-            let locked = self.inner.read().unwrap();
-            let mut targets = Vec::new();
-
-            for (tenant_shard_id, shard) in
-                locked.tenants.range(TenantShardId::tenant_range(tenant_id))
-            {
-                let node_id = shard.intent.attached.ok_or_else(|| {
-                    ApiError::InternalServerError(anyhow::anyhow!("Shard not scheduled"))
-                })?;
-                let node = locked
-                    .nodes
-                    .get(&node_id)
-                    .expect("Pageservers may not be deleted while referenced");
-
-                targets.push((*tenant_shard_id, node.clone()));
-            }
-            targets
-        };
-
-        // TODO: error out if the tenant is not attached anywhere.
-
-        // Phase 1: delete on the pageservers
-        let mut any_pending = false;
-        for (tenant_shard_id, node) in targets {
-            let client = mgmt_api::Client::new(node.base_url(), self.config.jwt_token.as_deref());
-            // TODO: this, like many other places, requires proper retry handling for 503, timeout: those should not
-            // surface immediately as an error to our caller.
-            let status = client.tenant_delete(tenant_shard_id).await.map_err(|e| {
-                ApiError::InternalServerError(anyhow::anyhow!(
-                    "Error deleting shard {tenant_shard_id} on node {}: {e}",
-                    node.id
-                ))
-            })?;
-            tracing::info!(
-                "Shard {tenant_shard_id} on node {}, delete returned {}",
-                node.id,
-                status
-            );
-            if status == StatusCode::ACCEPTED {
-                any_pending = true;
-            }
-        }
-
-        if any_pending {
-            // Caller should call us again later.  When we eventually see 404s from
-            // all the shards, we may proceed to delete our records of the tenant.
-            tracing::info!(
-                "Tenant {} has some shards pending deletion, returning 202",
-                tenant_id
-            );
-            return Ok(StatusCode::ACCEPTED);
-        }
-
-        // Fall through: deletion of the tenant on pageservers is complete, we may proceed to drop
-        // our in-memory state and database state.
-
-        // Ordering: we delete persistent state first: if we then
-        // crash, we will drop the in-memory state.
-
-        // Drop persistent state.
-        self.persistence.delete_tenant(tenant_id).await?;
-
-        // Drop in-memory state
-        {
-            let mut locked = self.inner.write().unwrap();
-            locked
-                .tenants
-                .retain(|tenant_shard_id, _shard| tenant_shard_id.tenant_id != tenant_id);
-            tracing::info!(
-                "Deleted tenant {tenant_id}, now have {} tenants",
-                locked.tenants.len()
-            );
-        };
-
-        // Success is represented as 404, to imitate the existing pageserver deletion API
-        Ok(StatusCode::NOT_FOUND)
+        Ok(TenantCreateResponse {
+            shards: response_shards,
+        })
     }
 
     pub(crate) async fn tenant_timeline_create(
@@ -1005,15 +677,25 @@ impl Service {
     ) -> Result<TimelineInfo, ApiError> {
         let mut timeline_info = None;
 
-        tracing::info!(
-            "Creating timeline {}/{}",
-            tenant_id,
-            create_req.new_timeline_id,
-        );
+        let ensure_waiters = {
+            let locked = self.inner.write().unwrap();
+            tracing::info!(
+                "Creating timeline {}/{}, have {} pageservers",
+                tenant_id,
+                create_req.new_timeline_id,
+                locked.nodes.len()
+            );
 
-        self.ensure_attached_wait(tenant_id).await?;
+            self.ensure_attached(locked, tenant_id)
+                .map_err(ApiError::InternalServerError)?
+        };
+
+        let deadline = Instant::now().checked_add(Duration::from_secs(5)).unwrap();
+        for waiter in ensure_waiters {
+            let timeout = deadline.duration_since(Instant::now());
+            waiter.wait_timeout(timeout).await?;
+        }
 
-        // TODO: refuse to do this if shard splitting is in progress
         let targets = {
             let locked = self.inner.read().unwrap();
             let mut targets = Vec::new();
@@ -1084,111 +766,6 @@ impl Service {
         Ok(timeline_info.expect("targets cannot be empty"))
     }
 
-    pub(crate) async fn tenant_timeline_delete(
-        &self,
-        tenant_id: TenantId,
-        timeline_id: TimelineId,
-    ) -> Result<StatusCode, ApiError> {
-        tracing::info!("Deleting timeline {}/{}", tenant_id, timeline_id,);
-
-        self.ensure_attached_wait(tenant_id).await?;
-
-        // TODO: refuse to do this if shard splitting is in progress
-        let targets = {
-            let locked = self.inner.read().unwrap();
-            let mut targets = Vec::new();
-
-            for (tenant_shard_id, shard) in
-                locked.tenants.range(TenantShardId::tenant_range(tenant_id))
-            {
-                let node_id = shard.intent.attached.ok_or_else(|| {
-                    ApiError::InternalServerError(anyhow::anyhow!("Shard not scheduled"))
-                })?;
-                let node = locked
-                    .nodes
-                    .get(&node_id)
-                    .expect("Pageservers may not be deleted while referenced");
-
-                targets.push((*tenant_shard_id, node.clone()));
-            }
-            targets
-        };
-
-        if targets.is_empty() {
-            return Err(ApiError::NotFound(
-                anyhow::anyhow!("Tenant not found").into(),
-            ));
-        }
-
-        // TODO: call into shards concurrently
-        let mut any_pending = false;
-        for (tenant_shard_id, node) in targets {
-            let client = mgmt_api::Client::new(node.base_url(), self.config.jwt_token.as_deref());
-
-            tracing::info!(
-                "Deleting timeline on shard {}/{}, attached to node {}",
-                tenant_shard_id,
-                timeline_id,
-                node.id
-            );
-
-            let status = client
-                .timeline_delete(tenant_shard_id, timeline_id)
-                .await
-                .map_err(|e| {
-                    ApiError::InternalServerError(anyhow::anyhow!(
-                    "Error deleting timeline {timeline_id} on {tenant_shard_id} on node {}: {e}",
-                    node.id
-                ))
-                })?;
-
-            if status == StatusCode::ACCEPTED {
-                any_pending = true;
-            }
-        }
-
-        if any_pending {
-            Ok(StatusCode::ACCEPTED)
-        } else {
-            Ok(StatusCode::NOT_FOUND)
-        }
-    }
-
-    /// When you need to send an HTTP request to the pageserver that holds shard0 of a tenant, this
-    /// function looks it up and returns the url.  If the tenant isn't found, returns Err(ApiError::NotFound)
-    pub(crate) fn tenant_shard0_baseurl(
-        &self,
-        tenant_id: TenantId,
-    ) -> Result<(String, TenantShardId), ApiError> {
-        let locked = self.inner.read().unwrap();
-        let Some((tenant_shard_id, shard)) = locked
-            .tenants
-            .range(TenantShardId::tenant_range(tenant_id))
-            .next()
-        else {
-            return Err(ApiError::NotFound(
-                anyhow::anyhow!("Tenant {tenant_id} not found").into(),
-            ));
-        };
-
-        // TODO: should use the ID last published to compute_hook, rather than the intent: the intent might
-        // point to somewhere we haven't attached yet.
-        let Some(node_id) = shard.intent.attached else {
-            return Err(ApiError::Conflict(
-                "Cannot call timeline API on non-attached tenant".to_string(),
-            ));
-        };
-
-        let Some(node) = locked.nodes.get(&node_id) else {
-            // This should never happen
-            return Err(ApiError::InternalServerError(anyhow::anyhow!(
-                "Shard refers to nonexistent node"
-            )));
-        };
-
-        Ok((node.base_url(), *tenant_shard_id))
-    }
-
     pub(crate) fn tenant_locate(
         &self,
         tenant_id: TenantId,
@@ -1291,6 +868,7 @@ impl Service {
             } else {
                 let old_attached = shard.intent.attached;
 
+                shard.intent.attached = Some(migrate_req.node_id);
                 match shard.policy {
                     PlacementPolicy::Single => {
                         shard.intent.secondary.clear();
@@ -1304,13 +882,7 @@ impl Service {
                             shard.intent.secondary.push(old_attached);
                         }
                     }
-                    PlacementPolicy::Detached => {
-                        return Err(ApiError::BadRequest(anyhow::anyhow!(
-                            "Cannot migrate a tenant that is PlacementPolicy::Detached: configure it to an attached policy first"
-                        )))
-                    }
                 }
-                shard.intent.attached = Some(migrate_req.node_id);
 
                 tracing::info!("Migrating: new intent {:?}", shard.intent);
                 shard.sequence = shard.sequence.next();
@@ -1334,20 +906,6 @@ impl Service {
         Ok(TenantShardMigrateResponse {})
     }
 
-    pub(crate) async fn node_list(&self) -> Result<Vec<NodePersistence>, ApiError> {
-        // It is convenient to avoid taking the big lock and converting Node to a serializable
-        // structure, by fetching from storage instead of reading in-memory state.
-        let nodes = self
-            .persistence
-            .list_nodes()
-            .await?
-            .into_iter()
-            .map(|n| n.to_persistent())
-            .collect();
-
-        Ok(nodes)
-    }
-
     pub(crate) async fn node_register(
         &self,
         register_req: NodeRegisterRequest,
@@ -1397,7 +955,10 @@ impl Service {
             availability: NodeAvailability::Active,
         };
         // TODO: idempotency if the node already exists in the database
-        self.persistence.insert_node(&new_node).await?;
+        self.persistence
+            .insert_node(&new_node)
+            .await
+            .map_err(ApiError::InternalServerError)?;
 
         let mut locked = self.inner.write().unwrap();
         let mut new_nodes = (*locked.nodes).clone();
@@ -1521,7 +1082,7 @@ impl Service {
     /// Helper for methods that will try and call pageserver APIs for
     /// a tenant, such as timeline CRUD: they cannot proceed unless the tenant
     /// is attached somewhere.
-    fn ensure_attached_schedule(
+    fn ensure_attached(
         &self,
         mut locked: std::sync::RwLockWriteGuard<'_, ServiceState>,
         tenant_id: TenantId,
@@ -1551,23 +1112,6 @@ impl Service {
         Ok(waiters)
     }
 
-    async fn ensure_attached_wait(&self, tenant_id: TenantId) -> Result<(), ApiError> {
-        let ensure_waiters = {
-            let locked = self.inner.write().unwrap();
-
-            self.ensure_attached_schedule(locked, tenant_id)
-                .map_err(ApiError::InternalServerError)?
-        };
-
-        let deadline = Instant::now().checked_add(Duration::from_secs(5)).unwrap();
-        for waiter in ensure_waiters {
-            let timeout = deadline.duration_since(Instant::now());
-            waiter.wait_timeout(timeout).await?;
-        }
-
-        Ok(())
-    }
-
     /// Check all tenants for pending reconciliation work, and reconcile those in need
     ///
     /// Returns how many reconciliation tasks were started

control_plane/attachment_service/src/tenant_state.rs

@@ -312,18 +312,6 @@ impl TenantState {
                     modified = true;
                 }
             }
-            Detached => {
-                // Should have no attached or secondary pageservers
-                if self.intent.attached.is_some() {
-                    self.intent.attached = None;
-                    modified = true;
-                }
-
-                if !self.intent.secondary.is_empty() {
-                    self.intent.secondary.clear();
-                    modified = true;
-                }
-            }
         }
 
         if modified {

control_plane/src/attachment_service.rs

@@ -1,11 +1,5 @@
 use crate::{background_process, local_env::LocalEnv};
-use camino::{Utf8Path, Utf8PathBuf};
-use diesel::{
-    backend::Backend,
-    query_builder::{AstPass, QueryFragment, QueryId},
-    Connection, PgConnection, QueryResult, RunQueryDsl,
-};
-use diesel_migrations::{HarnessWithOutput, MigrationHarness};
+use camino::Utf8PathBuf;
 use hyper::Method;
 use pageserver_api::{
     models::{ShardParameters, TenantCreateRequest, TimelineCreateRequest, TimelineInfo},
@@ -13,11 +7,10 @@ use pageserver_api::{
 };
 use pageserver_client::mgmt_api::ResponseErrorMessageExt;
 use postgres_backend::AuthType;
+use postgres_connection::parse_host_port;
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
-use std::{env, str::FromStr};
-use tokio::process::Command;
+use std::{path::PathBuf, process::Child, str::FromStr};
 use tracing::instrument;
-use url::Url;
 use utils::{
     auth::{Claims, Scope},
     id::{NodeId, TenantId},
@@ -26,17 +19,14 @@ use utils::{
 pub struct AttachmentService {
     env: LocalEnv,
     listen: String,
-    path: Utf8PathBuf,
+    path: PathBuf,
     jwt_token: Option<String>,
     public_key_path: Option<Utf8PathBuf>,
-    postgres_port: u16,
     client: reqwest::Client,
 }
 
 const COMMAND: &str = "attachment_service";
 
-const ATTACHMENT_SERVICE_POSTGRES_VERSION: u32 = 16;
-
 #[derive(Serialize, Deserialize)]
 pub struct AttachHookRequest {
     pub tenant_shard_id: TenantShardId,
@@ -60,7 +50,6 @@ pub struct InspectResponse {
 
 #[derive(Serialize, Deserialize)]
 pub struct TenantCreateResponseShard {
-    pub shard_id: TenantShardId,
     pub node_id: NodeId,
     pub generation: u32,
 }
@@ -180,9 +169,7 @@ pub struct TenantShardMigrateResponse {}
 
 impl AttachmentService {
     pub fn from_env(env: &LocalEnv) -> Self {
-        let path = Utf8PathBuf::from_path_buf(env.base_data_dir.clone())
-            .unwrap()
-            .join("attachments.json");
+        let path = env.base_data_dir.join("attachments.json");
 
         // Makes no sense to construct this if pageservers aren't going to use it: assume
         // pageservers have control plane API set
@@ -194,13 +181,6 @@ impl AttachmentService {
             listen_url.port().unwrap()
         );
 
-        // Convention: NeonEnv in python tests reserves the next port after the control_plane_api
-        // port, for use by our captive postgres.
-        let postgres_port = listen_url
-            .port()
-            .expect("Control plane API setting should always have a port")
-            + 1;
-
         // Assume all pageservers have symmetric auth configuration: this service
         // expects to use one JWT token to talk to all of them.
         let ps_conf = env
@@ -229,7 +209,6 @@ impl AttachmentService {
             listen,
             jwt_token,
             public_key_path,
-            postgres_port,
             client: reqwest::ClientBuilder::new()
                 .build()
                 .expect("Failed to construct http client"),
@@ -241,214 +220,13 @@ impl AttachmentService {
             .expect("non-Unicode path")
     }
 
-    /// PIDFile for the postgres instance used to store attachment service state
-    fn postgres_pid_file(&self) -> Utf8PathBuf {
-        Utf8PathBuf::from_path_buf(
-            self.env
-                .base_data_dir
-                .join("attachment_service_postgres.pid"),
-        )
-        .expect("non-Unicode path")
-    }
+    pub async fn start(&self) -> anyhow::Result<Child> {
+        let path_str = self.path.to_string_lossy();
 
-    /// In order to access database migrations, we need to find the Neon source tree
-    async fn find_source_root(&self) -> anyhow::Result<Utf8PathBuf> {
-        // We assume that either prd or our binary is in the source tree. The former is usually
-        // true for automated test runners, the latter is usually true for developer workstations. Often
-        // both are true, which is fine.
-        let candidate_start_points = [
-            // Current working directory
-            Utf8PathBuf::from_path_buf(std::env::current_dir()?).unwrap(),
-            // Directory containing the binary we're running inside
-            Utf8PathBuf::from_path_buf(env::current_exe()?.parent().unwrap().to_owned()).unwrap(),
-        ];
-
-        // For each candidate start point, search through ancestors looking for a neon.git source tree root
-        for start_point in &candidate_start_points {
-            // Start from the build dir: assumes we are running out of a built neon source tree
-            for path in start_point.ancestors() {
-                // A crude approximation: the root of the source tree is whatever contains a "control_plane"
-                // subdirectory.
-                let control_plane = path.join("control_plane");
-                if tokio::fs::try_exists(&control_plane).await? {
-                    return Ok(path.to_owned());
-                }
-            }
-        }
-
-        // Fall-through
-        Err(anyhow::anyhow!(
-            "Could not find control_plane src dir, after searching ancestors of {candidate_start_points:?}"
-        ))
-    }
-
-    /// Find the directory containing postgres binaries, such as `initdb` and `pg_ctl`
-    ///
-    /// This usually uses ATTACHMENT_SERVICE_POSTGRES_VERSION of postgres, but will fall back
-    /// to other versions if that one isn't found.  Some automated tests create circumstances
-    /// where only one version is available in pg_distrib_dir, such as `test_remote_extensions`.
-    pub async fn get_pg_bin_dir(&self) -> anyhow::Result<Utf8PathBuf> {
-        let prefer_versions = [ATTACHMENT_SERVICE_POSTGRES_VERSION, 15, 14];
-
-        for v in prefer_versions {
-            let path = Utf8PathBuf::from_path_buf(self.env.pg_bin_dir(v)?).unwrap();
-            if tokio::fs::try_exists(&path).await? {
-                return Ok(path);
-            }
-        }
-
-        // Fall through
-        anyhow::bail!(
-            "Postgres binaries not found in {}",
-            self.env.pg_distrib_dir.display()
-        );
-    }
-
-    /// Readiness check for our postgres process
-    async fn pg_isready(&self, pg_bin_dir: &Utf8Path) -> anyhow::Result<bool> {
-        let bin_path = pg_bin_dir.join("pg_isready");
-        let args = ["-h", "localhost", "-p", &format!("{}", self.postgres_port)];
-        let exitcode = Command::new(bin_path).args(args).spawn()?.wait().await?;
-
-        Ok(exitcode.success())
-    }
-
-    /// Create our database if it doesn't exist, and run migrations.
-    ///
-    /// This function is equivalent to the `diesel setup` command in the diesel CLI.  We implement
-    /// the same steps by hand to avoid imposing a dependency on installing diesel-cli for developers
-    /// who just want to run `cargo neon_local` without knowing about diesel.
-    ///
-    /// Returns the database url
-    pub async fn setup_database(&self) -> anyhow::Result<String> {
-        let database_url = format!(
-            "postgresql://localhost:{}/attachment_service",
-            self.postgres_port
-        );
-        println!("Running attachment service database setup...");
-        fn change_database_of_url(database_url: &str, default_database: &str) -> (String, String) {
-            let base = ::url::Url::parse(database_url).unwrap();
-            let database = base.path_segments().unwrap().last().unwrap().to_owned();
-            let mut new_url = base.join(default_database).unwrap();
-            new_url.set_query(base.query());
-            (database, new_url.into())
-        }
-
-        #[derive(Debug, Clone)]
-        pub struct CreateDatabaseStatement {
-            db_name: String,
-        }
-
-        impl CreateDatabaseStatement {
-            pub fn new(db_name: &str) -> Self {
-                CreateDatabaseStatement {
-                    db_name: db_name.to_owned(),
-                }
-            }
-        }
-
-        impl<DB: Backend> QueryFragment<DB> for CreateDatabaseStatement {
-            fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, DB>) -> QueryResult<()> {
-                out.push_sql("CREATE DATABASE ");
-                out.push_identifier(&self.db_name)?;
-                Ok(())
-            }
-        }
-
-        impl<Conn> RunQueryDsl<Conn> for CreateDatabaseStatement {}
-
-        impl QueryId for CreateDatabaseStatement {
-            type QueryId = ();
-
-            const HAS_STATIC_QUERY_ID: bool = false;
-        }
-        if PgConnection::establish(&database_url).is_err() {
-            let (database, postgres_url) = change_database_of_url(&database_url, "postgres");
-            println!("Creating database: {database}");
-            let mut conn = PgConnection::establish(&postgres_url)?;
-            CreateDatabaseStatement::new(&database).execute(&mut conn)?;
-        }
-        let mut conn = PgConnection::establish(&database_url)?;
-
-        let migrations_dir = self
-            .find_source_root()
-            .await?
-            .join("control_plane/attachment_service/migrations");
-
-        let migrations = diesel_migrations::FileBasedMigrations::from_path(migrations_dir)?;
-        println!("Running migrations in {}", migrations.path().display());
-        HarnessWithOutput::write_to_stdout(&mut conn)
-            .run_pending_migrations(migrations)
-            .map(|_| ())
-            .map_err(|e| anyhow::anyhow!(e))?;
-
-        println!("Migrations complete");
-
-        Ok(database_url)
-    }
-
-    pub async fn start(&self) -> anyhow::Result<()> {
-        // Start a vanilla Postgres process used by the attachment service for persistence.
-        let pg_data_path = Utf8PathBuf::from_path_buf(self.env.base_data_dir.clone())
-            .unwrap()
-            .join("attachment_service_db");
-        let pg_bin_dir = self.get_pg_bin_dir().await?;
-        let pg_log_path = pg_data_path.join("postgres.log");
-
-        if !tokio::fs::try_exists(&pg_data_path).await? {
-            // Initialize empty database
-            let initdb_path = pg_bin_dir.join("initdb");
-            let mut child = Command::new(&initdb_path)
-                .args(["-D", pg_data_path.as_ref()])
-                .spawn()
-                .expect("Failed to spawn initdb");
-            let status = child.wait().await?;
-            if !status.success() {
-                anyhow::bail!("initdb failed with status {status}");
-            }
-
-            tokio::fs::write(
-                &pg_data_path.join("postgresql.conf"),
-                format!("port = {}", self.postgres_port),
-            )
-            .await?;
-        };
-
-        println!("Starting attachment service database...");
-        let db_start_args = [
-            "-w",
-            "-D",
-            pg_data_path.as_ref(),
-            "-l",
-            pg_log_path.as_ref(),
-            "start",
-        ];
-
-        background_process::start_process(
-            "attachment_service_db",
-            &self.env.base_data_dir,
-            pg_bin_dir.join("pg_ctl").as_std_path(),
-            db_start_args,
-            [],
-            background_process::InitialPidFile::Create(self.postgres_pid_file()),
-            || self.pg_isready(&pg_bin_dir),
-        )
-        .await?;
-
-        // Run migrations on every startup, in case something changed.
-        let database_url = self.setup_database().await?;
-
-        let mut args = vec![
-            "-l",
-            &self.listen,
-            "-p",
-            self.path.as_ref(),
-            "--database-url",
-            &database_url,
-        ]
-        .into_iter()
-        .map(|s| s.to_string())
-        .collect::<Vec<_>>();
+        let mut args = vec!["-l", &self.listen, "-p", &path_str]
+            .into_iter()
+            .map(|s| s.to_string())
+            .collect::<Vec<_>>();
         if let Some(jwt_token) = &self.jwt_token {
             args.push(format!("--jwt-token={jwt_token}"));
         }
@@ -457,7 +235,7 @@ impl AttachmentService {
             args.push(format!("--public-key={public_key_path}"));
         }
 
-        background_process::start_process(
+        let result = background_process::start_process(
             COMMAND,
             &self.env.base_data_dir,
             &self.env.attachment_service_bin(),
@@ -474,46 +252,29 @@ impl AttachmentService {
                 }
             },
         )
-        .await?;
+        .await;
 
-        Ok(())
-    }
-
-    pub async fn stop(&self, immediate: bool) -> anyhow::Result<()> {
-        background_process::stop_process(immediate, COMMAND, &self.pid_file())?;
-
-        let pg_data_path = self.env.base_data_dir.join("attachment_service_db");
-        let pg_bin_dir = self.get_pg_bin_dir().await?;
-
-        println!("Stopping attachment service database...");
-        let pg_stop_args = ["-D", &pg_data_path.to_string_lossy(), "stop"];
-        let stop_status = Command::new(pg_bin_dir.join("pg_ctl"))
-            .args(pg_stop_args)
-            .spawn()?
-            .wait()
+        for ps_conf in &self.env.pageservers {
+            let (pg_host, pg_port) =
+                parse_host_port(&ps_conf.listen_pg_addr).expect("Unable to parse listen_pg_addr");
+            let (http_host, http_port) = parse_host_port(&ps_conf.listen_http_addr)
+                .expect("Unable to parse listen_http_addr");
+            self.node_register(NodeRegisterRequest {
+                node_id: ps_conf.id,
+                listen_pg_addr: pg_host.to_string(),
+                listen_pg_port: pg_port.unwrap_or(5432),
+                listen_http_addr: http_host.to_string(),
+                listen_http_port: http_port.unwrap_or(80),
+            })
             .await?;
-        if !stop_status.success() {
-            let pg_status_args = ["-D", &pg_data_path.to_string_lossy(), "status"];
-            let status_exitcode = Command::new(pg_bin_dir.join("pg_ctl"))
-                .args(pg_status_args)
-                .spawn()?
-                .wait()
-                .await?;
-
-            // pg_ctl status returns this exit code if postgres is not running: in this case it is
-            // fine that stop failed.  Otherwise it is an error that stop failed.
-            const PG_STATUS_NOT_RUNNING: i32 = 3;
-            if Some(PG_STATUS_NOT_RUNNING) == status_exitcode.code() {
-                println!("Attachment service data base is already stopped");
-                return Ok(());
-            } else {
-                anyhow::bail!("Failed to stop attachment service database: {stop_status}")
-            }
         }
 
-        Ok(())
+        result
     }
 
+    pub fn stop(&self, immediate: bool) -> anyhow::Result<()> {
+        background_process::stop_process(immediate, COMMAND, &self.pid_file())
+    }
     /// Simple HTTP request wrapper for calling into attachment service
     async fn dispatch<RQ, RS>(
         &self,
@@ -525,15 +286,13 @@ impl AttachmentService {
         RQ: Serialize + Sized,
         RS: DeserializeOwned + Sized,
     {
-        // The configured URL has the /upcall path prefix for pageservers to use: we will strip that out
-        // for general purpose API access.
-        let listen_url = self.env.control_plane_api.clone().unwrap();
-        let url = Url::from_str(&format!(
-            "http://{}:{}/{path}",
-            listen_url.host_str().unwrap(),
-            listen_url.port().unwrap()
-        ))
-        .unwrap();
+        let url = self
+            .env
+            .control_plane_api
+            .clone()
+            .unwrap()
+            .join(&path)
+            .unwrap();
 
         let mut builder = self.client.request(method, url);
         if let Some(body) = body {
@@ -570,7 +329,7 @@ impl AttachmentService {
         let response = self
             .dispatch::<_, AttachHookResponse>(
                 Method::POST,
-                "debug/v1/attach-hook".to_string(),
+                "attach-hook".to_string(),
                 Some(request),
             )
             .await?;
@@ -586,11 +345,7 @@ impl AttachmentService {
         let request = InspectRequest { tenant_shard_id };
 
         let response = self
-            .dispatch::<_, InspectResponse>(
-                Method::POST,
-                "debug/v1/inspect".to_string(),
-                Some(request),
-            )
+            .dispatch::<_, InspectResponse>(Method::POST, "inspect".to_string(), Some(request))
             .await?;
 
         Ok(response.attachment)
@@ -601,18 +356,14 @@ impl AttachmentService {
         &self,
         req: TenantCreateRequest,
     ) -> anyhow::Result<TenantCreateResponse> {
-        self.dispatch(Method::POST, "v1/tenant".to_string(), Some(req))
+        self.dispatch(Method::POST, "tenant".to_string(), Some(req))
             .await
     }
 
     #[instrument(skip(self))]
     pub async fn tenant_locate(&self, tenant_id: TenantId) -> anyhow::Result<TenantLocateResponse> {
-        self.dispatch::<(), _>(
-            Method::GET,
-            format!("control/v1/tenant/{tenant_id}/locate"),
-            None,
-        )
-        .await
+        self.dispatch::<(), _>(Method::GET, format!("tenant/{tenant_id}/locate"), None)
+            .await
     }
 
     #[instrument(skip(self))]
@@ -634,7 +385,7 @@ impl AttachmentService {
 
     #[instrument(skip_all, fields(node_id=%req.node_id))]
     pub async fn node_register(&self, req: NodeRegisterRequest) -> anyhow::Result<()> {
-        self.dispatch::<_, ()>(Method::POST, "control/v1/node".to_string(), Some(req))
+        self.dispatch::<_, ()>(Method::POST, "node".to_string(), Some(req))
             .await
     }
 
@@ -642,7 +393,7 @@ impl AttachmentService {
     pub async fn node_configure(&self, req: NodeConfigureRequest) -> anyhow::Result<()> {
         self.dispatch::<_, ()>(
             Method::PUT,
-            format!("control/v1/node/{}/config", req.node_id),
+            format!("node/{}/config", req.node_id),
             Some(req),
         )
         .await
@@ -662,7 +413,7 @@ impl AttachmentService {
     ) -> anyhow::Result<TimelineInfo> {
         self.dispatch(
             Method::POST,
-            format!("v1/tenant/{tenant_id}/timeline"),
+            format!("tenant/{tenant_id}/timeline"),
             Some(req),
         )
         .await

control_plane/src/background_process.rs

@@ -17,7 +17,7 @@ use std::io::Write;
 use std::os::unix::prelude::AsRawFd;
 use std::os::unix::process::CommandExt;
 use std::path::Path;
-use std::process::Command;
+use std::process::{Child, Command};
 use std::time::Duration;
 use std::{fs, io, thread};
 
@@ -60,7 +60,7 @@ pub async fn start_process<F, Fut, AI, A, EI>(
     envs: EI,
     initial_pid_file: InitialPidFile,
     process_status_check: F,
-) -> anyhow::Result<()>
+) -> anyhow::Result<Child>
 where
     F: Fn() -> Fut,
     Fut: std::future::Future<Output = anyhow::Result<bool>>,
@@ -98,7 +98,7 @@ where
         InitialPidFile::Expect(path) => path,
     };
 
-    let spawned_process = filled_cmd.spawn().with_context(|| {
+    let mut spawned_process = filled_cmd.spawn().with_context(|| {
         format!("Could not spawn {process_name}, see console output and log files for details.")
     })?;
     let pid = spawned_process.id();
@@ -106,26 +106,12 @@ where
         i32::try_from(pid)
             .with_context(|| format!("Subprocess {process_name} has invalid pid {pid}"))?,
     );
-    // set up a scopeguard to kill & wait for the child in case we panic or bail below
-    let spawned_process = scopeguard::guard(spawned_process, |mut spawned_process| {
-        println!("SIGKILL & wait the started process");
-        (|| {
-            // TODO: use another signal that can be caught by the child so it can clean up any children it spawned (e..g, walredo).
-            spawned_process.kill().context("SIGKILL child")?;
-            spawned_process.wait().context("wait() for child process")?;
-            anyhow::Ok(())
-        })()
-        .with_context(|| format!("scopeguard kill&wait child {process_name:?}"))
-        .unwrap();
-    });
 
     for retries in 0..RETRIES {
         match process_started(pid, pid_file_to_check, &process_status_check).await {
             Ok(true) => {
-                println!("\n{process_name} started and passed status check, pid: {pid}");
-                // leak the child process, it'll outlive this neon_local invocation
-                drop(scopeguard::ScopeGuard::into_inner(spawned_process));
-                return Ok(());
+                println!("\n{process_name} started, pid: {pid}");
+                return Ok(spawned_process);
             }
             Ok(false) => {
                 if retries == NOTICE_AFTER_RETRIES {
@@ -140,15 +126,16 @@ where
                 thread::sleep(Duration::from_millis(RETRY_INTERVAL_MILLIS));
             }
             Err(e) => {
-                println!("error starting process {process_name:?}: {e:#}");
+                println!("{process_name} failed to start: {e:#}");
+                if let Err(e) = spawned_process.kill() {
+                    println!("Could not stop {process_name} subprocess: {e:#}")
+                };
                 return Err(e);
             }
         }
     }
     println!();
-    anyhow::bail!(
-        "{process_name} did not start+pass status checks within {RETRY_UNTIL_SECS} seconds"
-    );
+    anyhow::bail!("{process_name} did not start in {RETRY_UNTIL_SECS} seconds");
 }
 
 /// Stops the process, using the pid file given. Returns Ok also if the process is already not running.
@@ -256,9 +243,7 @@ fn fill_remote_storage_secrets_vars(mut cmd: &mut Command) -> &mut Command {
     for env_key in [
         "AWS_ACCESS_KEY_ID",
         "AWS_SECRET_ACCESS_KEY",
-        "AWS_PROFILE",
-        // HOME is needed in combination with `AWS_PROFILE` to pick up the SSO sessions.
-        "HOME",
+        "AWS_SESSION_TOKEN",
         "AZURE_STORAGE_ACCOUNT",
         "AZURE_STORAGE_ACCESS_KEY",
     ] {

control_plane/src/bin/neon_local.rs

@@ -51,7 +51,7 @@ project_git_version!(GIT_VERSION);
 
 const DEFAULT_PG_VERSION: &str = "15";
 
-const DEFAULT_PAGESERVER_CONTROL_PLANE_API: &str = "http://127.0.0.1:1234/upcall/v1/";
+const DEFAULT_PAGESERVER_CONTROL_PLANE_API: &str = "http://127.0.0.1:1234/";
 
 fn default_conf(num_pageservers: u16) -> String {
     let mut template = format!(
@@ -135,7 +135,7 @@ fn main() -> Result<()> {
             "tenant" => rt.block_on(handle_tenant(sub_args, &mut env)),
             "timeline" => rt.block_on(handle_timeline(sub_args, &mut env)),
             "start" => rt.block_on(handle_start_all(sub_args, &env)),
-            "stop" => rt.block_on(handle_stop_all(sub_args, &env)),
+            "stop" => handle_stop_all(sub_args, &env),
             "pageserver" => rt.block_on(handle_pageserver(sub_args, &env)),
             "attachment_service" => rt.block_on(handle_attachment_service(sub_args, &env)),
             "safekeeper" => rt.block_on(handle_safekeeper(sub_args, &env)),
@@ -1056,9 +1056,8 @@ fn get_pageserver(env: &local_env::LocalEnv, args: &ArgMatches) -> Result<PageSe
 async fn handle_pageserver(sub_match: &ArgMatches, env: &local_env::LocalEnv) -> Result<()> {
     match sub_match.subcommand() {
         Some(("start", subcommand_args)) => {
-            let register = subcommand_args.get_one::<bool>("register").unwrap_or(&true);
             if let Err(e) = get_pageserver(env, subcommand_args)?
-                .start(&pageserver_config_overrides(subcommand_args), *register)
+                .start(&pageserver_config_overrides(subcommand_args))
                 .await
             {
                 eprintln!("pageserver start failed: {e}");
@@ -1087,7 +1086,24 @@ async fn handle_pageserver(sub_match: &ArgMatches, env: &local_env::LocalEnv) ->
             }
 
             if let Err(e) = pageserver
-                .start(&pageserver_config_overrides(subcommand_args), false)
+                .start(&pageserver_config_overrides(subcommand_args))
+                .await
+            {
+                eprintln!("pageserver start failed: {e}");
+                exit(1);
+            }
+        }
+
+        Some(("migrate", subcommand_args)) => {
+            let pageserver = get_pageserver(env, subcommand_args)?;
+            //TODO what shutdown strategy should we use here?
+            if let Err(e) = pageserver.stop(false) {
+                eprintln!("pageserver stop failed: {}", e);
+                exit(1);
+            }
+
+            if let Err(e) = pageserver
+                .start(&pageserver_config_overrides(subcommand_args))
                 .await
             {
                 eprintln!("pageserver start failed: {e}");
@@ -1145,7 +1161,7 @@ async fn handle_attachment_service(
                 .map(|s| s.as_str())
                 == Some("immediate");
 
-            if let Err(e) = svc.stop(immediate).await {
+            if let Err(e) = svc.stop(immediate) {
                 eprintln!("stop failed: {}", e);
                 exit(1);
             }
@@ -1241,7 +1257,7 @@ async fn handle_start_all(sub_match: &ArgMatches, env: &local_env::LocalEnv) ->
         let attachment_service = AttachmentService::from_env(env);
         if let Err(e) = attachment_service.start().await {
             eprintln!("attachment_service start failed: {:#}", e);
-            try_stop_all(env, true).await;
+            try_stop_all(env, true);
             exit(1);
         }
     }
@@ -1249,11 +1265,11 @@ async fn handle_start_all(sub_match: &ArgMatches, env: &local_env::LocalEnv) ->
     for ps_conf in &env.pageservers {
         let pageserver = PageServerNode::from_env(env, ps_conf);
         if let Err(e) = pageserver
-            .start(&pageserver_config_overrides(sub_match), true)
+            .start(&pageserver_config_overrides(sub_match))
             .await
         {
             eprintln!("pageserver {} start failed: {:#}", ps_conf.id, e);
-            try_stop_all(env, true).await;
+            try_stop_all(env, true);
             exit(1);
         }
     }
@@ -1262,23 +1278,23 @@ async fn handle_start_all(sub_match: &ArgMatches, env: &local_env::LocalEnv) ->
         let safekeeper = SafekeeperNode::from_env(env, node);
         if let Err(e) = safekeeper.start(vec![]).await {
             eprintln!("safekeeper {} start failed: {:#}", safekeeper.id, e);
-            try_stop_all(env, false).await;
+            try_stop_all(env, false);
             exit(1);
         }
     }
     Ok(())
 }
 
-async fn handle_stop_all(sub_match: &ArgMatches, env: &local_env::LocalEnv) -> Result<()> {
+fn handle_stop_all(sub_match: &ArgMatches, env: &local_env::LocalEnv) -> Result<()> {
     let immediate =
         sub_match.get_one::<String>("stop-mode").map(|s| s.as_str()) == Some("immediate");
 
-    try_stop_all(env, immediate).await;
+    try_stop_all(env, immediate);
 
     Ok(())
 }
 
-async fn try_stop_all(env: &local_env::LocalEnv, immediate: bool) {
+fn try_stop_all(env: &local_env::LocalEnv, immediate: bool) {
     // Stop all endpoints
     match ComputeControlPlane::load(env.clone()) {
         Ok(cplane) => {
@@ -1313,7 +1329,7 @@ async fn try_stop_all(env: &local_env::LocalEnv, immediate: bool) {
 
     if env.control_plane_api.is_some() {
         let attachment_service = AttachmentService::from_env(env);
-        if let Err(e) = attachment_service.stop(immediate).await {
+        if let Err(e) = attachment_service.stop(immediate) {
             eprintln!("attachment service stop failed: {e:#}");
         }
     }
@@ -1533,11 +1549,7 @@ fn cli() -> Command {
                 .subcommand(Command::new("status"))
                 .subcommand(Command::new("start")
                     .about("Start local pageserver")
-                    .arg(pageserver_config_args.clone()).arg(Arg::new("register")
-                    .long("register")
-                    .default_value("true").required(false)
-                    .value_parser(value_parser!(bool))
-                    .value_name("register"))
+                    .arg(pageserver_config_args.clone())
                 )
                 .subcommand(Command::new("stop")
                     .about("Stop local pageserver")

control_plane/src/endpoint.rs

@@ -57,7 +57,7 @@ use crate::local_env::LocalEnv;
 use crate::postgresql_conf::PostgresConf;
 
 use compute_api::responses::{ComputeState, ComputeStatus};
-use compute_api::spec::{Cluster, ComputeFeature, ComputeMode, ComputeSpec};
+use compute_api::spec::{Cluster, ComputeMode, ComputeSpec};
 
 // contents of a endpoint.json file
 #[derive(Serialize, Deserialize, PartialEq, Eq, Clone, Debug)]
@@ -70,7 +70,6 @@ pub struct EndpointConf {
     http_port: u16,
     pg_version: u32,
     skip_pg_catalog_updates: bool,
-    features: Vec<ComputeFeature>,
 }
 
 //
@@ -141,7 +140,6 @@ impl ComputeControlPlane {
             // with this we basically test a case of waking up an idle compute, where
             // we also skip catalog updates in the cloud.
             skip_pg_catalog_updates: true,
-            features: vec![],
         });
 
         ep.create_endpoint_dir()?;
@@ -156,7 +154,6 @@ impl ComputeControlPlane {
                 pg_port,
                 pg_version,
                 skip_pg_catalog_updates: true,
-                features: vec![],
             })?,
         )?;
         std::fs::write(
@@ -218,9 +215,6 @@ pub struct Endpoint {
 
     // Optimizations
     skip_pg_catalog_updates: bool,
-
-    // Feature flags
-    features: Vec<ComputeFeature>,
 }
 
 impl Endpoint {
@@ -250,7 +244,6 @@ impl Endpoint {
             tenant_id: conf.tenant_id,
             pg_version: conf.pg_version,
             skip_pg_catalog_updates: conf.skip_pg_catalog_updates,
-            features: conf.features,
         })
     }
 
@@ -438,7 +431,7 @@ impl Endpoint {
     }
 
     fn wait_for_compute_ctl_to_exit(&self, send_sigterm: bool) -> Result<()> {
-        // TODO use background_process::stop_process instead: https://github.com/neondatabase/neon/pull/6482
+        // TODO use background_process::stop_process instead
         let pidfile_path = self.endpoint_path().join("compute_ctl.pid");
         let pid: u32 = std::fs::read_to_string(pidfile_path)?.parse()?;
         let pid = nix::unistd::Pid::from_raw(pid as i32);
@@ -526,7 +519,7 @@ impl Endpoint {
             skip_pg_catalog_updates: self.skip_pg_catalog_updates,
             format_version: 1.0,
             operation_uuid: None,
-            features: self.features.clone(),
+            features: vec![],
             cluster: Cluster {
                 cluster_id: None, // project ID: not used
                 name: None,       // project name: not used
@@ -583,21 +576,9 @@ impl Endpoint {
         }
 
         let child = cmd.spawn()?;
-        // set up a scopeguard to kill & wait for the child in case we panic or bail below
-        let child = scopeguard::guard(child, |mut child| {
-            println!("SIGKILL & wait the started process");
-            (|| {
-                // TODO: use another signal that can be caught by the child so it can clean up any children it spawned
-                child.kill().context("SIGKILL child")?;
-                child.wait().context("wait() for child process")?;
-                anyhow::Ok(())
-            })()
-            .with_context(|| format!("scopeguard kill&wait child {child:?}"))
-            .unwrap();
-        });
 
         // Write down the pid so we can wait for it when we want to stop
-        // TODO use background_process::start_process instead: https://github.com/neondatabase/neon/pull/6482
+        // TODO use background_process::start_process instead
         let pid = child.id();
         let pidfile_path = self.endpoint_path().join("compute_ctl.pid");
         std::fs::write(pidfile_path, pid.to_string())?;
@@ -646,9 +627,6 @@ impl Endpoint {
             std::thread::sleep(ATTEMPT_INTERVAL);
         }
 
-        // disarm the scopeguard, let the child outlive this function (and neon_local invoction)
-        drop(scopeguard::ScopeGuard::into_inner(child));
-
         Ok(())
     }
 

control_plane/src/local_env.rs

@@ -223,11 +223,7 @@ impl LocalEnv {
     }
 
     pub fn attachment_service_bin(&self) -> PathBuf {
-        // Irrespective of configuration, attachment service binary is always
-        // run from the same location as neon_local.  This means that for compatibility
-        // tests that run old pageserver/safekeeper, they still run latest attachment service.
-        let neon_local_bin_dir = env::current_exe().unwrap().parent().unwrap().to_owned();
-        neon_local_bin_dir.join("attachment_service")
+        self.neon_distrib_dir.join("attachment_service")
     }
 
     pub fn safekeeper_bin(&self) -> PathBuf {

control_plane/src/pageserver.rs

@@ -11,7 +11,7 @@ use std::io;
 use std::io::Write;
 use std::num::NonZeroU64;
 use std::path::PathBuf;
-use std::process::Command;
+use std::process::{Child, Command};
 use std::time::Duration;
 
 use anyhow::{bail, Context};
@@ -30,7 +30,6 @@ use utils::{
     lsn::Lsn,
 };
 
-use crate::attachment_service::{AttachmentService, NodeRegisterRequest};
 use crate::local_env::PageServerConf;
 use crate::{background_process, local_env::LocalEnv};
 
@@ -162,8 +161,8 @@ impl PageServerNode {
             .expect("non-Unicode path")
     }
 
-    pub async fn start(&self, config_overrides: &[&str], register: bool) -> anyhow::Result<()> {
-        self.start_node(config_overrides, false, register).await
+    pub async fn start(&self, config_overrides: &[&str]) -> anyhow::Result<Child> {
+        self.start_node(config_overrides, false).await
     }
 
     fn pageserver_init(&self, config_overrides: &[&str]) -> anyhow::Result<()> {
@@ -208,8 +207,7 @@ impl PageServerNode {
         &self,
         config_overrides: &[&str],
         update_config: bool,
-        register: bool,
-    ) -> anyhow::Result<()> {
+    ) -> anyhow::Result<Child> {
         // TODO: using a thread here because start_process() is not async but we need to call check_status()
         let datadir = self.repo_path();
         print!(
@@ -246,26 +244,7 @@ impl PageServerNode {
                 }
             },
         )
-        .await?;
-
-        if register {
-            let attachment_service = AttachmentService::from_env(&self.env);
-            let (pg_host, pg_port) =
-                parse_host_port(&self.conf.listen_pg_addr).expect("Unable to parse listen_pg_addr");
-            let (http_host, http_port) = parse_host_port(&self.conf.listen_http_addr)
-                .expect("Unable to parse listen_http_addr");
-            attachment_service
-                .node_register(NodeRegisterRequest {
-                    node_id: self.conf.id,
-                    listen_pg_addr: pg_host.to_string(),
-                    listen_pg_port: pg_port.unwrap_or(5432),
-                    listen_http_addr: http_host.to_string(),
-                    listen_http_port: http_port.unwrap_or(80),
-                })
-                .await?;
-        }
-
-        Ok(())
+        .await
     }
 
     fn pageserver_basic_args<'a>(
@@ -395,11 +374,6 @@ impl PageServerNode {
                 .transpose()
                 .context("Failed to parse 'gc_feedback' as bool")?,
             heatmap_period: settings.remove("heatmap_period").map(|x| x.to_string()),
-            lazy_slru_download: settings
-                .remove("lazy_slru_download")
-                .map(|x| x.parse::<bool>())
-                .transpose()
-                .context("Failed to parse 'lazy_slru_download' as bool")?,
         };
         if !settings.is_empty() {
             bail!("Unrecognized tenant settings: {settings:?}")
@@ -500,11 +474,6 @@ impl PageServerNode {
                     .transpose()
                     .context("Failed to parse 'gc_feedback' as bool")?,
                 heatmap_period: settings.remove("heatmap_period").map(|x| x.to_string()),
-                lazy_slru_download: settings
-                    .remove("lazy_slru_download")
-                    .map(|x| x.parse::<bool>())
-                    .transpose()
-                    .context("Failed to parse 'lazy_slru_download' as bool")?,
             }
         };
 

control_plane/src/safekeeper.rs

@@ -7,6 +7,7 @@
 //! ```
 use std::io::Write;
 use std::path::PathBuf;
+use std::process::Child;
 use std::{io, result};
 
 use anyhow::Context;
@@ -103,7 +104,7 @@ impl SafekeeperNode {
             .expect("non-Unicode path")
     }
 
-    pub async fn start(&self, extra_opts: Vec<String>) -> anyhow::Result<()> {
+    pub async fn start(&self, extra_opts: Vec<String>) -> anyhow::Result<Child> {
         print!(
             "Starting safekeeper at '{}' in '{}'",
             self.pg_connection_config.raw_address(),

diesel.toml

@@ -1,9 +0,0 @@
-# For documentation on how to configure this file,
-# see https://diesel.rs/guides/configuring-diesel-cli
-
-[print_schema]
-file = "control_plane/attachment_service/src/schema.rs"
-custom_type_derives = ["diesel::query_builder::QueryId"]
-
-[migrations_directory]
-dir = "control_plane/attachment_service/migrations"

libs/compute_api/src/spec.rs

@@ -90,9 +90,6 @@ pub enum ComputeFeature {
     /// track short-lived connections as user activity.
     ActivityMonitorExperimental,
 
-    /// Enable running migrations
-    Migrations,
-
     /// This is a special feature flag that is used to represent unknown feature flags.
     /// Basically all unknown to enum flags are represented as this one. See unit test
     /// `parse_unknown_features()` for more details.

libs/metrics/Cargo.toml

@@ -9,10 +9,5 @@ prometheus.workspace = true
 libc.workspace = true
 once_cell.workspace = true
 chrono.workspace = true
-twox-hash.workspace = true
 
 workspace_hack.workspace = true
-
-[dev-dependencies]
-rand = "0.8"
-rand_distr = "0.4.3"

libs/metrics/src/hll.rs

@@ -1,523 +0,0 @@
-//! HyperLogLog is an algorithm for the count-distinct problem,
-//! approximating the number of distinct elements in a multiset.
-//! Calculating the exact cardinality of the distinct elements
-//! of a multiset requires an amount of memory proportional to
-//! the cardinality, which is impractical for very large data sets.
-//! Probabilistic cardinality estimators, such as the HyperLogLog algorithm,
-//! use significantly less memory than this, but can only approximate the cardinality.
-
-use std::{
-    collections::HashMap,
-    hash::{BuildHasher, BuildHasherDefault, Hash, Hasher},
-    sync::{atomic::AtomicU8, Arc, RwLock},
-};
-
-use prometheus::{
-    core::{self, Describer},
-    proto, Opts,
-};
-use twox_hash::xxh3;
-
-/// Create an [`HyperLogLogVec`] and registers to default registry.
-#[macro_export(local_inner_macros)]
-macro_rules! register_hll_vec {
-    ($N:literal, $OPTS:expr, $LABELS_NAMES:expr $(,)?) => {{
-        let hll_vec = $crate::HyperLogLogVec::<$N>::new($OPTS, $LABELS_NAMES).unwrap();
-        $crate::register(Box::new(hll_vec.clone())).map(|_| hll_vec)
-    }};
-
-    ($N:literal, $NAME:expr, $HELP:expr, $LABELS_NAMES:expr $(,)?) => {{
-        $crate::register_hll_vec!($N, $crate::opts!($NAME, $HELP), $LABELS_NAMES)
-    }};
-}
-
-/// Create an [`HyperLogLog`] and registers to default registry.
-#[macro_export(local_inner_macros)]
-macro_rules! register_hll {
-    ($N:literal, $OPTS:expr $(,)?) => {{
-        let hll = $crate::HyperLogLog::<$N>::with_opts($OPTS).unwrap();
-        $crate::register(Box::new(hll.clone())).map(|_| hll)
-    }};
-
-    ($N:literal, $NAME:expr, $HELP:expr $(,)?) => {{
-        $crate::register_hll!($N, $crate::opts!($NAME, $HELP), $LABELS_NAMES)
-    }};
-}
-
-/// HLL is a probabilistic cardinality measure.
-///
-/// How to use this time-series for a metric name `my_metrics_total_hll`:
-///
-/// ```promql
-/// # harmonic mean
-/// 1 / (
-///     sum (
-///         2 ^ -(
-///             # HLL merge operation
-///             max (my_metrics_total_hll{}) by (hll_shard, other_labels...)
-///         )
-///     ) without (hll_shard)
-/// )
-/// * alpha
-/// * shards_count
-/// * shards_count
-/// ```
-///
-/// If you want an estimate over time, you can use the following query:
-///
-/// ```promql
-/// # harmonic mean
-/// 1 / (
-///     sum (
-///         2 ^ -(
-///             # HLL merge operation
-///             max (
-///                 max_over_time(my_metrics_total_hll{}[$__rate_interval])
-///             ) by (hll_shard, other_labels...)
-///         )
-///     ) without (hll_shard)
-/// )
-/// * alpha
-/// * shards_count
-/// * shards_count
-/// ```
-///
-/// In the case of low cardinality, you might want to use the linear counting approximation:
-///
-/// ```promql
-/// # LinearCounting(m, V) = m log (m / V)
-/// shards_count * ln(shards_count /
-///     # calculate V = how many shards contain a 0
-///     count(max (proxy_connecting_endpoints{}) by (hll_shard, protocol) == 0) without (hll_shard)
-/// )
-/// ```
-///
-/// See <https://en.wikipedia.org/wiki/HyperLogLog#Practical_considerations> for estimates on alpha
-#[derive(Clone)]
-pub struct HyperLogLogVec<const N: usize> {
-    core: Arc<HyperLogLogVecCore<N>>,
-}
-
-struct HyperLogLogVecCore<const N: usize> {
-    pub children: RwLock<HashMap<u64, HyperLogLog<N>, BuildHasherDefault<xxh3::Hash64>>>,
-    pub desc: core::Desc,
-    pub opts: Opts,
-}
-
-impl<const N: usize> core::Collector for HyperLogLogVec<N> {
-    fn desc(&self) -> Vec<&core::Desc> {
-        vec![&self.core.desc]
-    }
-
-    fn collect(&self) -> Vec<proto::MetricFamily> {
-        let mut m = proto::MetricFamily::default();
-        m.set_name(self.core.desc.fq_name.clone());
-        m.set_help(self.core.desc.help.clone());
-        m.set_field_type(proto::MetricType::GAUGE);
-
-        let mut metrics = Vec::new();
-        for child in self.core.children.read().unwrap().values() {
-            child.core.collect_into(&mut metrics);
-        }
-        m.set_metric(metrics);
-
-        vec![m]
-    }
-}
-
-impl<const N: usize> HyperLogLogVec<N> {
-    /// Create a new [`HyperLogLogVec`] based on the provided
-    /// [`Opts`] and partitioned by the given label names. At least one label name must be
-    /// provided.
-    pub fn new(opts: Opts, label_names: &[&str]) -> prometheus::Result<Self> {
-        assert!(N.is_power_of_two());
-        let variable_names = label_names.iter().map(|s| (*s).to_owned()).collect();
-        let opts = opts.variable_labels(variable_names);
-
-        let desc = opts.describe()?;
-        let v = HyperLogLogVecCore {
-            children: RwLock::new(HashMap::default()),
-            desc,
-            opts,
-        };
-
-        Ok(Self { core: Arc::new(v) })
-    }
-
-    /// `get_metric_with_label_values` returns the [`HyperLogLog<P>`] for the given slice
-    /// of label values (same order as the VariableLabels in Desc). If that combination of
-    /// label values is accessed for the first time, a new [`HyperLogLog<P>`] is created.
-    ///
-    /// An error is returned if the number of label values is not the same as the
-    /// number of VariableLabels in Desc.
-    pub fn get_metric_with_label_values(
-        &self,
-        vals: &[&str],
-    ) -> prometheus::Result<HyperLogLog<N>> {
-        self.core.get_metric_with_label_values(vals)
-    }
-
-    /// `with_label_values` works as `get_metric_with_label_values`, but panics if an error
-    /// occurs.
-    pub fn with_label_values(&self, vals: &[&str]) -> HyperLogLog<N> {
-        self.get_metric_with_label_values(vals).unwrap()
-    }
-}
-
-impl<const N: usize> HyperLogLogVecCore<N> {
-    pub fn get_metric_with_label_values(
-        &self,
-        vals: &[&str],
-    ) -> prometheus::Result<HyperLogLog<N>> {
-        let h = self.hash_label_values(vals)?;
-
-        if let Some(metric) = self.children.read().unwrap().get(&h).cloned() {
-            return Ok(metric);
-        }
-
-        self.get_or_create_metric(h, vals)
-    }
-
-    pub(crate) fn hash_label_values(&self, vals: &[&str]) -> prometheus::Result<u64> {
-        if vals.len() != self.desc.variable_labels.len() {
-            return Err(prometheus::Error::InconsistentCardinality {
-                expect: self.desc.variable_labels.len(),
-                got: vals.len(),
-            });
-        }
-
-        let mut h = xxh3::Hash64::default();
-        for val in vals {
-            h.write(val.as_bytes());
-        }
-
-        Ok(h.finish())
-    }
-
-    fn get_or_create_metric(
-        &self,
-        hash: u64,
-        label_values: &[&str],
-    ) -> prometheus::Result<HyperLogLog<N>> {
-        let mut children = self.children.write().unwrap();
-        // Check exist first.
-        if let Some(metric) = children.get(&hash).cloned() {
-            return Ok(metric);
-        }
-
-        let metric = HyperLogLog::with_opts_and_label_values(&self.opts, label_values)?;
-        children.insert(hash, metric.clone());
-        Ok(metric)
-    }
-}
-
-/// HLL is a probabilistic cardinality measure.
-///
-/// How to use this time-series for a metric name `my_metrics_total_hll`:
-///
-/// ```promql
-/// # harmonic mean
-/// 1 / (
-///     sum (
-///         2 ^ -(
-///             # HLL merge operation
-///             max (my_metrics_total_hll{}) by (hll_shard, other_labels...)
-///         )
-///     ) without (hll_shard)
-/// )
-/// * alpha
-/// * shards_count
-/// * shards_count
-/// ```
-///
-/// If you want an estimate over time, you can use the following query:
-///
-/// ```promql
-/// # harmonic mean
-/// 1 / (
-///     sum (
-///         2 ^ -(
-///             # HLL merge operation
-///             max (
-///                 max_over_time(my_metrics_total_hll{}[$__rate_interval])
-///             ) by (hll_shard, other_labels...)
-///         )
-///     ) without (hll_shard)
-/// )
-/// * alpha
-/// * shards_count
-/// * shards_count
-/// ```
-///
-/// In the case of low cardinality, you might want to use the linear counting approximation:
-///
-/// ```promql
-/// # LinearCounting(m, V) = m log (m / V)
-/// shards_count * ln(shards_count /
-///     # calculate V = how many shards contain a 0
-///     count(max (proxy_connecting_endpoints{}) by (hll_shard, protocol) == 0) without (hll_shard)
-/// )
-/// ```
-///
-/// See <https://en.wikipedia.org/wiki/HyperLogLog#Practical_considerations> for estimates on alpha
-#[derive(Clone)]
-pub struct HyperLogLog<const N: usize> {
-    core: Arc<HyperLogLogCore<N>>,
-}
-
-impl<const N: usize> HyperLogLog<N> {
-    /// Create a [`HyperLogLog`] with the `name` and `help` arguments.
-    pub fn new<S1: Into<String>, S2: Into<String>>(name: S1, help: S2) -> prometheus::Result<Self> {
-        assert!(N.is_power_of_two());
-        let opts = Opts::new(name, help);
-        Self::with_opts(opts)
-    }
-
-    /// Create a [`HyperLogLog`] with the `opts` options.
-    pub fn with_opts(opts: Opts) -> prometheus::Result<Self> {
-        Self::with_opts_and_label_values(&opts, &[])
-    }
-
-    fn with_opts_and_label_values(opts: &Opts, label_values: &[&str]) -> prometheus::Result<Self> {
-        let desc = opts.describe()?;
-        let labels = make_label_pairs(&desc, label_values)?;
-
-        let v = HyperLogLogCore {
-            shards: [0; N].map(AtomicU8::new),
-            desc,
-            labels,
-        };
-        Ok(Self { core: Arc::new(v) })
-    }
-
-    pub fn measure(&self, item: &impl Hash) {
-        // changing the hasher will break compatibility with previous measurements.
-        self.record(BuildHasherDefault::<xxh3::Hash64>::default().hash_one(item));
-    }
-
-    fn record(&self, hash: u64) {
-        let p = N.ilog2() as u8;
-        let j = hash & (N as u64 - 1);
-        let rho = (hash >> p).leading_zeros() as u8 + 1 - p;
-        self.core.shards[j as usize].fetch_max(rho, std::sync::atomic::Ordering::Relaxed);
-    }
-}
-
-struct HyperLogLogCore<const N: usize> {
-    shards: [AtomicU8; N],
-    desc: core::Desc,
-    labels: Vec<proto::LabelPair>,
-}
-
-impl<const N: usize> core::Collector for HyperLogLog<N> {
-    fn desc(&self) -> Vec<&core::Desc> {
-        vec![&self.core.desc]
-    }
-
-    fn collect(&self) -> Vec<proto::MetricFamily> {
-        let mut m = proto::MetricFamily::default();
-        m.set_name(self.core.desc.fq_name.clone());
-        m.set_help(self.core.desc.help.clone());
-        m.set_field_type(proto::MetricType::GAUGE);
-
-        let mut metrics = Vec::new();
-        self.core.collect_into(&mut metrics);
-        m.set_metric(metrics);
-
-        vec![m]
-    }
-}
-
-impl<const N: usize> HyperLogLogCore<N> {
-    fn collect_into(&self, metrics: &mut Vec<proto::Metric>) {
-        self.shards.iter().enumerate().for_each(|(i, x)| {
-            let mut shard_label = proto::LabelPair::default();
-            shard_label.set_name("hll_shard".to_owned());
-            shard_label.set_value(format!("{i}"));
-
-            // We reset the counter to 0 so we can perform a cardinality measure over any time slice in prometheus.
-
-            // This seems like it would be a race condition,
-            // but HLL is not impacted by a write in one shard happening in between.
-            // This is because in PromQL we will be implementing a harmonic mean of all buckets.
-            // we will also merge samples in a time series using `max by (hll_shard)`.
-
-            // TODO: maybe we shouldn't reset this on every collect, instead, only after a time window.
-            // this would mean that a dev port-forwarding the metrics url won't break the sampling.
-            let v = x.swap(0, std::sync::atomic::Ordering::Relaxed);
-
-            let mut m = proto::Metric::default();
-            let mut c = proto::Gauge::default();
-            c.set_value(v as f64);
-            m.set_gauge(c);
-
-            let mut labels = Vec::with_capacity(self.labels.len() + 1);
-            labels.extend_from_slice(&self.labels);
-            labels.push(shard_label);
-
-            m.set_label(labels);
-            metrics.push(m);
-        })
-    }
-}
-
-fn make_label_pairs(
-    desc: &core::Desc,
-    label_values: &[&str],
-) -> prometheus::Result<Vec<proto::LabelPair>> {
-    if desc.variable_labels.len() != label_values.len() {
-        return Err(prometheus::Error::InconsistentCardinality {
-            expect: desc.variable_labels.len(),
-            got: label_values.len(),
-        });
-    }
-
-    let total_len = desc.variable_labels.len() + desc.const_label_pairs.len();
-    if total_len == 0 {
-        return Ok(vec![]);
-    }
-
-    if desc.variable_labels.is_empty() {
-        return Ok(desc.const_label_pairs.clone());
-    }
-
-    let mut label_pairs = Vec::with_capacity(total_len);
-    for (i, n) in desc.variable_labels.iter().enumerate() {
-        let mut label_pair = proto::LabelPair::default();
-        label_pair.set_name(n.clone());
-        label_pair.set_value(label_values[i].to_owned());
-        label_pairs.push(label_pair);
-    }
-
-    for label_pair in &desc.const_label_pairs {
-        label_pairs.push(label_pair.clone());
-    }
-    label_pairs.sort();
-    Ok(label_pairs)
-}
-
-#[cfg(test)]
-mod tests {
-    use std::collections::HashSet;
-
-    use prometheus::{proto, Opts};
-    use rand::{rngs::StdRng, Rng, SeedableRng};
-    use rand_distr::{Distribution, Zipf};
-
-    use crate::HyperLogLogVec;
-
-    fn collect(hll: &HyperLogLogVec<32>) -> Vec<proto::Metric> {
-        let mut metrics = vec![];
-        hll.core
-            .children
-            .read()
-            .unwrap()
-            .values()
-            .for_each(|c| c.core.collect_into(&mut metrics));
-        metrics
-    }
-    fn get_cardinality(metrics: &[proto::Metric], filter: impl Fn(&proto::Metric) -> bool) -> f64 {
-        let mut buckets = [0.0; 32];
-        for metric in metrics.chunks_exact(32) {
-            if filter(&metric[0]) {
-                for (i, m) in metric.iter().enumerate() {
-                    buckets[i] = f64::max(buckets[i], m.get_gauge().get_value());
-                }
-            }
-        }
-
-        buckets
-            .into_iter()
-            .map(|f| 2.0f64.powf(-f))
-            .sum::<f64>()
-            .recip()
-            * 0.697
-            * 32.0
-            * 32.0
-    }
-
-    fn test_cardinality(n: usize, dist: impl Distribution<f64>) -> ([usize; 3], [f64; 3]) {
-        let hll = HyperLogLogVec::<32>::new(Opts::new("foo", "bar"), &["x"]).unwrap();
-
-        let mut iter = StdRng::seed_from_u64(0x2024_0112).sample_iter(dist);
-        let mut set_a = HashSet::new();
-        let mut set_b = HashSet::new();
-
-        for x in iter.by_ref().take(n) {
-            set_a.insert(x.to_bits());
-            hll.with_label_values(&["a"]).measure(&x.to_bits());
-        }
-        for x in iter.by_ref().take(n) {
-            set_b.insert(x.to_bits());
-            hll.with_label_values(&["b"]).measure(&x.to_bits());
-        }
-        let merge = &set_a | &set_b;
-
-        let metrics = collect(&hll);
-        let len = get_cardinality(&metrics, |_| true);
-        let len_a = get_cardinality(&metrics, |l| l.get_label()[0].get_value() == "a");
-        let len_b = get_cardinality(&metrics, |l| l.get_label()[0].get_value() == "b");
-
-        ([merge.len(), set_a.len(), set_b.len()], [len, len_a, len_b])
-    }
-
-    #[test]
-    fn test_cardinality_small() {
-        let (actual, estimate) = test_cardinality(100, Zipf::new(100, 1.2f64).unwrap());
-
-        assert_eq!(actual, [46, 30, 32]);
-        assert!(51.3 < estimate[0] && estimate[0] < 51.4);
-        assert!(44.0 < estimate[1] && estimate[1] < 44.1);
-        assert!(39.0 < estimate[2] && estimate[2] < 39.1);
-    }
-
-    #[test]
-    fn test_cardinality_medium() {
-        let (actual, estimate) = test_cardinality(10000, Zipf::new(10000, 1.2f64).unwrap());
-
-        assert_eq!(actual, [2529, 1618, 1629]);
-        assert!(2309.1 < estimate[0] && estimate[0] < 2309.2);
-        assert!(1566.6 < estimate[1] && estimate[1] < 1566.7);
-        assert!(1629.5 < estimate[2] && estimate[2] < 1629.6);
-    }
-
-    #[test]
-    fn test_cardinality_large() {
-        let (actual, estimate) = test_cardinality(1_000_000, Zipf::new(1_000_000, 1.2f64).unwrap());
-
-        assert_eq!(actual, [129077, 79579, 79630]);
-        assert!(126067.2 < estimate[0] && estimate[0] < 126067.3);
-        assert!(83076.8 < estimate[1] && estimate[1] < 83076.9);
-        assert!(64251.2 < estimate[2] && estimate[2] < 64251.3);
-    }
-
-    #[test]
-    fn test_cardinality_small2() {
-        let (actual, estimate) = test_cardinality(100, Zipf::new(200, 0.8f64).unwrap());
-
-        assert_eq!(actual, [92, 58, 60]);
-        assert!(116.1 < estimate[0] && estimate[0] < 116.2);
-        assert!(81.7 < estimate[1] && estimate[1] < 81.8);
-        assert!(69.3 < estimate[2] && estimate[2] < 69.4);
-    }
-
-    #[test]
-    fn test_cardinality_medium2() {
-        let (actual, estimate) = test_cardinality(10000, Zipf::new(20000, 0.8f64).unwrap());
-
-        assert_eq!(actual, [8201, 5131, 5051]);
-        assert!(6846.4 < estimate[0] && estimate[0] < 6846.5);
-        assert!(5239.1 < estimate[1] && estimate[1] < 5239.2);
-        assert!(4292.8 < estimate[2] && estimate[2] < 4292.9);
-    }
-
-    #[test]
-    fn test_cardinality_large2() {
-        let (actual, estimate) = test_cardinality(1_000_000, Zipf::new(2_000_000, 0.8f64).unwrap());
-
-        assert_eq!(actual, [777847, 482069, 482246]);
-        assert!(699437.4 < estimate[0] && estimate[0] < 699437.5);
-        assert!(374948.9 < estimate[1] && estimate[1] < 374949.0);
-        assert!(434609.7 < estimate[2] && estimate[2] < 434609.8);
-    }
-}

libs/metrics/src/lib.rs

@@ -28,9 +28,7 @@ use prometheus::{Registry, Result};
 pub mod launch_timestamp;
 mod wrappers;
 pub use wrappers::{CountedReader, CountedWriter};
-mod hll;
 pub mod metric_vec_duration;
-pub use hll::{HyperLogLog, HyperLogLogVec};
 
 pub type UIntGauge = GenericGauge<AtomicU64>;
 pub type UIntGaugeVec = GenericGaugeVec<AtomicU64>;

libs/pageserver_api/Cargo.toml

@@ -20,7 +20,6 @@ strum_macros.workspace = true
 hex.workspace = true
 thiserror.workspace = true
 humantime-serde.workspace = true
-chrono.workspace = true
 
 workspace_hack.workspace = true
 

libs/pageserver_api/src/key.rs

@@ -1,11 +1,9 @@
 use anyhow::{bail, Result};
 use byteorder::{ByteOrder, BE};
-use postgres_ffi::relfile_utils::{FSM_FORKNUM, VISIBILITYMAP_FORKNUM};
-use postgres_ffi::{Oid, TransactionId};
 use serde::{Deserialize, Serialize};
-use std::{fmt, ops::Range};
+use std::fmt;
 
-use crate::reltag::{BlockNumber, RelTag, SlruKind};
+use crate::reltag::{BlockNumber, RelTag};
 
 /// Key used in the Repository kv-store.
 ///
@@ -145,390 +143,12 @@ impl Key {
     }
 }
 
-// Layout of the Key address space
-//
-// The Key struct, used to address the underlying key-value store, consists of
-// 18 bytes, split into six fields. See 'Key' in repository.rs. We need to map
-// all the data and metadata keys into those 18 bytes.
-//
-// Principles for the mapping:
-//
-// - Things that are often accessed or modified together, should be close to
-//   each other in the key space. For example, if a relation is extended by one
-//   block, we create a new key-value pair for the block data, and update the
-//   relation size entry. Because of that, the RelSize key comes after all the
-//   RelBlocks of a relation: the RelSize and the last RelBlock are always next
-//   to each other.
-//
-// The key space is divided into four major sections, identified by the first
-// byte, and the form a hierarchy:
-//
-// 00 Relation data and metadata
-//
-//   DbDir    () -> (dbnode, spcnode)
-//   Filenodemap
-//   RelDir   -> relnode forknum
-//       RelBlocks
-//       RelSize
-//
-// 01 SLRUs
-//
-//   SlruDir  kind
-//   SlruSegBlocks segno
-//   SlruSegSize
-//
-// 02 pg_twophase
-//
-// 03 misc
-//    Controlfile
-//    checkpoint
-//    pg_version
-//
-// 04 aux files
-//
-// Below is a full list of the keyspace allocation:
-//
-// DbDir:
-// 00 00000000 00000000 00000000 00   00000000
-//
-// Filenodemap:
-// 00 SPCNODE  DBNODE   00000000 00   00000000
-//
-// RelDir:
-// 00 SPCNODE  DBNODE   00000000 00   00000001 (Postgres never uses relfilenode 0)
-//
-// RelBlock:
-// 00 SPCNODE  DBNODE   RELNODE  FORK BLKNUM
-//
-// RelSize:
-// 00 SPCNODE  DBNODE   RELNODE  FORK FFFFFFFF
-//
-// SlruDir:
-// 01 kind     00000000 00000000 00   00000000
-//
-// SlruSegBlock:
-// 01 kind     00000001 SEGNO    00   BLKNUM
-//
-// SlruSegSize:
-// 01 kind     00000001 SEGNO    00   FFFFFFFF
-//
-// TwoPhaseDir:
-// 02 00000000 00000000 00000000 00   00000000
-//
-// TwoPhaseFile:
-// 02 00000000 00000000 00000000 00   XID
-//
-// ControlFile:
-// 03 00000000 00000000 00000000 00   00000000
-//
-// Checkpoint:
-// 03 00000000 00000000 00000000 00   00000001
-//
-// AuxFiles:
-// 03 00000000 00000000 00000000 00   00000002
-//
-
-//-- Section 01: relation data and metadata
-
-pub const DBDIR_KEY: Key = Key {
-    field1: 0x00,
-    field2: 0,
-    field3: 0,
-    field4: 0,
-    field5: 0,
-    field6: 0,
-};
-
-#[inline(always)]
-pub fn dbdir_key_range(spcnode: Oid, dbnode: Oid) -> Range<Key> {
-    Key {
-        field1: 0x00,
-        field2: spcnode,
-        field3: dbnode,
-        field4: 0,
-        field5: 0,
-        field6: 0,
-    }..Key {
-        field1: 0x00,
-        field2: spcnode,
-        field3: dbnode,
-        field4: 0xffffffff,
-        field5: 0xff,
-        field6: 0xffffffff,
-    }
-}
-
-#[inline(always)]
-pub fn relmap_file_key(spcnode: Oid, dbnode: Oid) -> Key {
-    Key {
-        field1: 0x00,
-        field2: spcnode,
-        field3: dbnode,
-        field4: 0,
-        field5: 0,
-        field6: 0,
-    }
-}
-
-#[inline(always)]
-pub fn rel_dir_to_key(spcnode: Oid, dbnode: Oid) -> Key {
-    Key {
-        field1: 0x00,
-        field2: spcnode,
-        field3: dbnode,
-        field4: 0,
-        field5: 0,
-        field6: 1,
-    }
-}
-
-#[inline(always)]
-pub fn rel_block_to_key(rel: RelTag, blknum: BlockNumber) -> Key {
-    Key {
-        field1: 0x00,
-        field2: rel.spcnode,
-        field3: rel.dbnode,
-        field4: rel.relnode,
-        field5: rel.forknum,
-        field6: blknum,
-    }
-}
-
-#[inline(always)]
-pub fn rel_size_to_key(rel: RelTag) -> Key {
-    Key {
-        field1: 0x00,
-        field2: rel.spcnode,
-        field3: rel.dbnode,
-        field4: rel.relnode,
-        field5: rel.forknum,
-        field6: 0xffffffff,
-    }
-}
-
-#[inline(always)]
-pub fn rel_key_range(rel: RelTag) -> Range<Key> {
-    Key {
-        field1: 0x00,
-        field2: rel.spcnode,
-        field3: rel.dbnode,
-        field4: rel.relnode,
-        field5: rel.forknum,
-        field6: 0,
-    }..Key {
-        field1: 0x00,
-        field2: rel.spcnode,
-        field3: rel.dbnode,
-        field4: rel.relnode,
-        field5: rel.forknum + 1,
-        field6: 0,
-    }
-}
-
-//-- Section 02: SLRUs
-
-#[inline(always)]
-pub fn slru_dir_to_key(kind: SlruKind) -> Key {
-    Key {
-        field1: 0x01,
-        field2: match kind {
-            SlruKind::Clog => 0x00,
-            SlruKind::MultiXactMembers => 0x01,
-            SlruKind::MultiXactOffsets => 0x02,
-        },
-        field3: 0,
-        field4: 0,
-        field5: 0,
-        field6: 0,
-    }
-}
-
-#[inline(always)]
-pub fn slru_block_to_key(kind: SlruKind, segno: u32, blknum: BlockNumber) -> Key {
-    Key {
-        field1: 0x01,
-        field2: match kind {
-            SlruKind::Clog => 0x00,
-            SlruKind::MultiXactMembers => 0x01,
-            SlruKind::MultiXactOffsets => 0x02,
-        },
-        field3: 1,
-        field4: segno,
-        field5: 0,
-        field6: blknum,
-    }
-}
-
-#[inline(always)]
-pub fn slru_segment_size_to_key(kind: SlruKind, segno: u32) -> Key {
-    Key {
-        field1: 0x01,
-        field2: match kind {
-            SlruKind::Clog => 0x00,
-            SlruKind::MultiXactMembers => 0x01,
-            SlruKind::MultiXactOffsets => 0x02,
-        },
-        field3: 1,
-        field4: segno,
-        field5: 0,
-        field6: 0xffffffff,
-    }
-}
-
-#[inline(always)]
-pub fn slru_segment_key_range(kind: SlruKind, segno: u32) -> Range<Key> {
-    let field2 = match kind {
-        SlruKind::Clog => 0x00,
-        SlruKind::MultiXactMembers => 0x01,
-        SlruKind::MultiXactOffsets => 0x02,
-    };
-
-    Key {
-        field1: 0x01,
-        field2,
-        field3: 1,
-        field4: segno,
-        field5: 0,
-        field6: 0,
-    }..Key {
-        field1: 0x01,
-        field2,
-        field3: 1,
-        field4: segno,
-        field5: 1,
-        field6: 0,
-    }
-}
-
-//-- Section 03: pg_twophase
-
-pub const TWOPHASEDIR_KEY: Key = Key {
-    field1: 0x02,
-    field2: 0,
-    field3: 0,
-    field4: 0,
-    field5: 0,
-    field6: 0,
-};
-
-#[inline(always)]
-pub fn twophase_file_key(xid: TransactionId) -> Key {
-    Key {
-        field1: 0x02,
-        field2: 0,
-        field3: 0,
-        field4: 0,
-        field5: 0,
-        field6: xid,
-    }
-}
-
-#[inline(always)]
-pub fn twophase_key_range(xid: TransactionId) -> Range<Key> {
-    let (next_xid, overflowed) = xid.overflowing_add(1);
-
-    Key {
-        field1: 0x02,
-        field2: 0,
-        field3: 0,
-        field4: 0,
-        field5: 0,
-        field6: xid,
-    }..Key {
-        field1: 0x02,
-        field2: 0,
-        field3: 0,
-        field4: 0,
-        field5: u8::from(overflowed),
-        field6: next_xid,
-    }
-}
-
-//-- Section 03: Control file
-pub const CONTROLFILE_KEY: Key = Key {
-    field1: 0x03,
-    field2: 0,
-    field3: 0,
-    field4: 0,
-    field5: 0,
-    field6: 0,
-};
-
-pub const CHECKPOINT_KEY: Key = Key {
-    field1: 0x03,
-    field2: 0,
-    field3: 0,
-    field4: 0,
-    field5: 0,
-    field6: 1,
-};
-
-pub const AUX_FILES_KEY: Key = Key {
-    field1: 0x03,
-    field2: 0,
-    field3: 0,
-    field4: 0,
-    field5: 0,
-    field6: 2,
-};
-
-// Reverse mappings for a few Keys.
-// These are needed by WAL redo manager.
-
-// AUX_FILES currently stores only data for logical replication (slots etc), and
-// we don't preserve these on a branch because safekeepers can't follow timeline
-// switch (and generally it likely should be optional), so ignore these.
-#[inline(always)]
-pub fn is_inherited_key(key: Key) -> bool {
-    key != AUX_FILES_KEY
-}
-
-#[inline(always)]
-pub fn is_rel_fsm_block_key(key: Key) -> bool {
-    key.field1 == 0x00 && key.field4 != 0 && key.field5 == FSM_FORKNUM && key.field6 != 0xffffffff
-}
-
-#[inline(always)]
-pub fn is_rel_vm_block_key(key: Key) -> bool {
-    key.field1 == 0x00
-        && key.field4 != 0
-        && key.field5 == VISIBILITYMAP_FORKNUM
-        && key.field6 != 0xffffffff
-}
-
-#[inline(always)]
-pub fn key_to_slru_block(key: Key) -> anyhow::Result<(SlruKind, u32, BlockNumber)> {
-    Ok(match key.field1 {
-        0x01 => {
-            let kind = match key.field2 {
-                0x00 => SlruKind::Clog,
-                0x01 => SlruKind::MultiXactMembers,
-                0x02 => SlruKind::MultiXactOffsets,
-                _ => anyhow::bail!("unrecognized slru kind 0x{:02x}", key.field2),
-            };
-            let segno = key.field4;
-            let blknum = key.field6;
-
-            (kind, segno, blknum)
-        }
-        _ => anyhow::bail!("unexpected value kind 0x{:02x}", key.field1),
-    })
-}
-
-#[inline(always)]
-pub fn is_slru_block_key(key: Key) -> bool {
-    key.field1 == 0x01                // SLRU-related
-        && key.field3 == 0x00000001   // but not SlruDir
-        && key.field6 != 0xffffffff // and not SlruSegSize
-}
-
 #[inline(always)]
 pub fn is_rel_block_key(key: &Key) -> bool {
     key.field1 == 0x00 && key.field4 != 0 && key.field6 != 0xffffffff
 }
 
 /// Guaranteed to return `Ok()` if [[is_rel_block_key]] returns `true` for `key`.
-#[inline(always)]
 pub fn key_to_rel_block(key: Key) -> anyhow::Result<(RelTag, BlockNumber)> {
     Ok(match key.field1 {
         0x00 => (

libs/pageserver_api/src/keyspace.rs

@@ -63,84 +63,16 @@ impl KeySpace {
         KeyPartitioning { parts }
     }
 
-    /// Update the keyspace such that it doesn't contain any range
-    /// that is overlapping with `other`. This can involve splitting or
-    /// removing of existing ranges.
-    pub fn remove_overlapping_with(&mut self, other: &KeySpace) {
-        let (self_start, self_end) = match (self.start(), self.end()) {
-            (Some(start), Some(end)) => (start, end),
-            _ => {
-                // self is empty
-                return;
-            }
-        };
-
-        // Key spaces are sorted by definition, so skip ahead to the first
-        // potentially intersecting range. Similarly, ignore ranges that start
-        // after the current keyspace ends.
-        let other_ranges = other
-            .ranges
-            .iter()
-            .skip_while(|range| self_start >= range.end)
-            .take_while(|range| self_end > range.start);
-
-        for range in other_ranges {
-            while let Some(overlap_at) = self.overlaps_at(range) {
-                let overlapped = self.ranges[overlap_at].clone();
-
-                if overlapped.start < range.start && overlapped.end <= range.end {
-                    // Higher part of the range is completely overlapped.
-                    self.ranges[overlap_at].end = range.start;
-                }
-                if overlapped.start >= range.start && overlapped.end > range.end {
-                    // Lower part of the range is completely overlapped.
-                    self.ranges[overlap_at].start = range.end;
-                }
-                if overlapped.start < range.start && overlapped.end > range.end {
-                    // Middle part of the range is overlapped.
-                    self.ranges[overlap_at].end = range.start;
-                    self.ranges
-                        .insert(overlap_at + 1, range.end..overlapped.end);
-                }
-                if overlapped.start >= range.start && overlapped.end <= range.end {
-                    // Whole range is overlapped
-                    self.ranges.remove(overlap_at);
-                }
-            }
-        }
-    }
-
-    pub fn start(&self) -> Option<Key> {
-        self.ranges.first().map(|range| range.start)
-    }
-
-    pub fn end(&self) -> Option<Key> {
-        self.ranges.last().map(|range| range.end)
-    }
-
-    #[allow(unused)]
-    pub fn total_size(&self) -> usize {
-        self.ranges
-            .iter()
-            .map(|range| key_range_size(range) as usize)
-            .sum()
-    }
-
-    fn overlaps_at(&self, range: &Range<Key>) -> Option<usize> {
-        match self.ranges.binary_search_by_key(&range.end, |r| r.start) {
-            Ok(0) => None,
-            Err(0) => None,
-            Ok(index) if self.ranges[index - 1].end > range.start => Some(index - 1),
-            Err(index) if self.ranges[index - 1].end > range.start => Some(index - 1),
-            _ => None,
-        }
-    }
-
     ///
     /// Check if key space contains overlapping range
     ///
     pub fn overlaps(&self, range: &Range<Key>) -> bool {
-        self.overlaps_at(range).is_some()
+        match self.ranges.binary_search_by_key(&range.end, |r| r.start) {
+            Ok(0) => false,
+            Err(0) => false,
+            Ok(index) => self.ranges[index - 1].end > range.start,
+            Err(index) => self.ranges[index - 1].end > range.start,
+        }
     }
 }
 
@@ -172,7 +104,6 @@ pub struct KeySpaceAccum {
     accum: Option<Range<Key>>,
 
     ranges: Vec<Range<Key>>,
-    size: u64,
 }
 
 impl KeySpaceAccum {
@@ -180,7 +111,6 @@ impl KeySpaceAccum {
         Self {
             accum: None,
             ranges: Vec::new(),
-            size: 0,
         }
     }
 
@@ -191,8 +121,6 @@ impl KeySpaceAccum {
 
     #[inline(always)]
     pub fn add_range(&mut self, range: Range<Key>) {
-        self.size += key_range_size(&range) as u64;
-
         match self.accum.as_mut() {
             Some(accum) => {
                 if range.start == accum.end {
@@ -218,23 +146,6 @@ impl KeySpaceAccum {
             ranges: self.ranges,
         }
     }
-
-    pub fn consume_keyspace(&mut self) -> KeySpace {
-        if let Some(accum) = self.accum.take() {
-            self.ranges.push(accum);
-        }
-
-        let mut prev_accum = KeySpaceAccum::new();
-        std::mem::swap(self, &mut prev_accum);
-
-        KeySpace {
-            ranges: prev_accum.ranges,
-        }
-    }
-
-    pub fn size(&self) -> u64 {
-        self.size
-    }
 }
 
 ///
@@ -343,30 +254,6 @@ mod tests {
         }
     }
 
-    #[test]
-    fn keyspace_consume() {
-        let ranges = vec![kr(0..10), kr(20..35), kr(40..45)];
-
-        let mut accum = KeySpaceAccum::new();
-        for range in &ranges {
-            accum.add_range(range.clone());
-        }
-
-        let expected_size: u64 = ranges.iter().map(|r| key_range_size(r) as u64).sum();
-        assert_eq!(accum.size(), expected_size);
-
-        assert_ks_eq(&accum.consume_keyspace(), ranges.clone());
-        assert_eq!(accum.size(), 0);
-
-        assert_ks_eq(&accum.consume_keyspace(), vec![]);
-        assert_eq!(accum.size(), 0);
-
-        for range in &ranges {
-            accum.add_range(range.clone());
-        }
-        assert_ks_eq(&accum.to_keyspace(), ranges);
-    }
-
     #[test]
     fn keyspace_add_range() {
         // two separate ranges
@@ -509,118 +396,4 @@ mod tests {
         //        xxxxxxxxxxx
         assert!(ks.overlaps(&kr(0..30))); // XXXXX This fails currently!
     }
-
-    #[test]
-    fn test_remove_full_overlapps() {
-        let mut key_space1 = KeySpace {
-            ranges: vec![
-                Key::from_i128(1)..Key::from_i128(4),
-                Key::from_i128(5)..Key::from_i128(8),
-                Key::from_i128(10)..Key::from_i128(12),
-            ],
-        };
-        let key_space2 = KeySpace {
-            ranges: vec![
-                Key::from_i128(2)..Key::from_i128(3),
-                Key::from_i128(6)..Key::from_i128(7),
-                Key::from_i128(11)..Key::from_i128(13),
-            ],
-        };
-        key_space1.remove_overlapping_with(&key_space2);
-        assert_eq!(
-            key_space1.ranges,
-            vec![
-                Key::from_i128(1)..Key::from_i128(2),
-                Key::from_i128(3)..Key::from_i128(4),
-                Key::from_i128(5)..Key::from_i128(6),
-                Key::from_i128(7)..Key::from_i128(8),
-                Key::from_i128(10)..Key::from_i128(11)
-            ]
-        );
-    }
-
-    #[test]
-    fn test_remove_partial_overlaps() {
-        // Test partial ovelaps
-        let mut key_space1 = KeySpace {
-            ranges: vec![
-                Key::from_i128(1)..Key::from_i128(5),
-                Key::from_i128(7)..Key::from_i128(10),
-                Key::from_i128(12)..Key::from_i128(15),
-            ],
-        };
-        let key_space2 = KeySpace {
-            ranges: vec![
-                Key::from_i128(3)..Key::from_i128(6),
-                Key::from_i128(8)..Key::from_i128(11),
-                Key::from_i128(14)..Key::from_i128(17),
-            ],
-        };
-        key_space1.remove_overlapping_with(&key_space2);
-        assert_eq!(
-            key_space1.ranges,
-            vec![
-                Key::from_i128(1)..Key::from_i128(3),
-                Key::from_i128(7)..Key::from_i128(8),
-                Key::from_i128(12)..Key::from_i128(14),
-            ]
-        );
-    }
-
-    #[test]
-    fn test_remove_no_overlaps() {
-        let mut key_space1 = KeySpace {
-            ranges: vec![
-                Key::from_i128(1)..Key::from_i128(5),
-                Key::from_i128(7)..Key::from_i128(10),
-                Key::from_i128(12)..Key::from_i128(15),
-            ],
-        };
-        let key_space2 = KeySpace {
-            ranges: vec![
-                Key::from_i128(6)..Key::from_i128(7),
-                Key::from_i128(11)..Key::from_i128(12),
-                Key::from_i128(15)..Key::from_i128(17),
-            ],
-        };
-        key_space1.remove_overlapping_with(&key_space2);
-        assert_eq!(
-            key_space1.ranges,
-            vec![
-                Key::from_i128(1)..Key::from_i128(5),
-                Key::from_i128(7)..Key::from_i128(10),
-                Key::from_i128(12)..Key::from_i128(15),
-            ]
-        );
-    }
-
-    #[test]
-    fn test_remove_one_range_overlaps_multiple() {
-        let mut key_space1 = KeySpace {
-            ranges: vec![
-                Key::from_i128(1)..Key::from_i128(3),
-                Key::from_i128(3)..Key::from_i128(6),
-                Key::from_i128(6)..Key::from_i128(10),
-                Key::from_i128(12)..Key::from_i128(15),
-                Key::from_i128(17)..Key::from_i128(20),
-                Key::from_i128(20)..Key::from_i128(30),
-                Key::from_i128(30)..Key::from_i128(40),
-            ],
-        };
-        let key_space2 = KeySpace {
-            ranges: vec![Key::from_i128(9)..Key::from_i128(19)],
-        };
-        key_space1.remove_overlapping_with(&key_space2);
-        assert_eq!(
-            key_space1.ranges,
-            vec![
-                Key::from_i128(1)..Key::from_i128(3),
-                Key::from_i128(3)..Key::from_i128(6),
-                Key::from_i128(6)..Key::from_i128(9),
-                Key::from_i128(19)..Key::from_i128(20),
-                Key::from_i128(20)..Key::from_i128(30),
-                Key::from_i128(30)..Key::from_i128(40),
-            ]
-        );
-    }
 }

libs/pageserver_api/src/models.rs

@@ -8,7 +8,6 @@ use std::{
 };
 
 use byteorder::{BigEndian, ReadBytesExt};
-use postgres_ffi::BLCKSZ;
 use serde::{Deserialize, Serialize};
 use serde_with::serde_as;
 use strum_macros;
@@ -272,7 +271,6 @@ pub struct TenantConfig {
     pub evictions_low_residence_duration_metric_threshold: Option<String>,
     pub gc_feedback: Option<bool>,
     pub heatmap_period: Option<String>,
-    pub lazy_slru_download: Option<bool>,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
@@ -366,19 +364,6 @@ pub struct TenantLocationConfigRequest {
     pub config: LocationConfig, // as we have a flattened field, we should reject all unknown fields in it
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-#[serde(deny_unknown_fields)]
-pub struct TenantShardLocation {
-    pub shard_id: TenantShardId,
-    pub node_id: NodeId,
-}
-
-#[derive(Serialize, Deserialize, Debug)]
-#[serde(deny_unknown_fields)]
-pub struct TenantLocationConfigResponse {
-    pub shards: Vec<TenantShardLocation>,
-}
-
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(deny_unknown_fields)]
 pub struct TenantConfigRequest {
@@ -454,8 +439,6 @@ pub struct TenantDetails {
     #[serde(flatten)]
     pub tenant_info: TenantInfo,
 
-    pub walredo: Option<WalRedoManagerStatus>,
-
     pub timelines: Vec<TimelineId>,
 }
 
@@ -643,12 +626,6 @@ pub struct TimelineGcRequest {
     pub gc_horizon: Option<u64>,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct WalRedoManagerStatus {
-    pub last_redo_at: Option<chrono::DateTime<chrono::Utc>>,
-    pub pid: Option<u32>,
-}
-
 // Wrapped in libpq CopyData
 #[derive(PartialEq, Eq, Debug)]
 pub enum PagestreamFeMessage {
@@ -656,7 +633,6 @@ pub enum PagestreamFeMessage {
     Nblocks(PagestreamNblocksRequest),
     GetPage(PagestreamGetPageRequest),
     DbSize(PagestreamDbSizeRequest),
-    GetSlruSegment(PagestreamGetSlruSegmentRequest),
 }
 
 // Wrapped in libpq CopyData
@@ -667,7 +643,6 @@ pub enum PagestreamBeMessage {
     GetPage(PagestreamGetPageResponse),
     Error(PagestreamErrorResponse),
     DbSize(PagestreamDbSizeResponse),
-    GetSlruSegment(PagestreamGetSlruSegmentResponse),
 }
 
 // Keep in sync with `pagestore_client.h`
@@ -678,7 +653,6 @@ enum PagestreamBeMessageTag {
     GetPage = 102,
     Error = 103,
     DbSize = 104,
-    GetSlruSegment = 105,
 }
 impl TryFrom<u8> for PagestreamBeMessageTag {
     type Error = u8;
@@ -689,7 +663,6 @@ impl TryFrom<u8> for PagestreamBeMessageTag {
             102 => Ok(PagestreamBeMessageTag::GetPage),
             103 => Ok(PagestreamBeMessageTag::Error),
             104 => Ok(PagestreamBeMessageTag::DbSize),
-            105 => Ok(PagestreamBeMessageTag::GetSlruSegment),
             _ => Err(value),
         }
     }
@@ -724,14 +697,6 @@ pub struct PagestreamDbSizeRequest {
     pub dbnode: u32,
 }
 
-#[derive(Debug, PartialEq, Eq)]
-pub struct PagestreamGetSlruSegmentRequest {
-    pub latest: bool,
-    pub lsn: Lsn,
-    pub kind: u8,
-    pub segno: u32,
-}
-
 #[derive(Debug)]
 pub struct PagestreamExistsResponse {
     pub exists: bool,
@@ -747,11 +712,6 @@ pub struct PagestreamGetPageResponse {
     pub page: Bytes,
 }
 
-#[derive(Debug)]
-pub struct PagestreamGetSlruSegmentResponse {
-    pub segment: Bytes,
-}
-
 #[derive(Debug)]
 pub struct PagestreamErrorResponse {
     pub message: String,
@@ -815,14 +775,6 @@ impl PagestreamFeMessage {
                 bytes.put_u64(req.lsn.0);
                 bytes.put_u32(req.dbnode);
             }
-
-            Self::GetSlruSegment(req) => {
-                bytes.put_u8(4);
-                bytes.put_u8(u8::from(req.latest));
-                bytes.put_u64(req.lsn.0);
-                bytes.put_u8(req.kind);
-                bytes.put_u32(req.segno);
-            }
         }
 
         bytes.into()
@@ -873,14 +825,6 @@ impl PagestreamFeMessage {
                 lsn: Lsn::from(body.read_u64::<BigEndian>()?),
                 dbnode: body.read_u32::<BigEndian>()?,
             })),
-            4 => Ok(PagestreamFeMessage::GetSlruSegment(
-                PagestreamGetSlruSegmentRequest {
-                    latest: body.read_u8()? != 0,
-                    lsn: Lsn::from(body.read_u64::<BigEndian>()?),
-                    kind: body.read_u8()?,
-                    segno: body.read_u32::<BigEndian>()?,
-                },
-            )),
             _ => bail!("unknown smgr message tag: {:?}", msg_tag),
         }
     }
@@ -916,12 +860,6 @@ impl PagestreamBeMessage {
                 bytes.put_u8(Tag::DbSize as u8);
                 bytes.put_i64(resp.db_size);
             }
-
-            Self::GetSlruSegment(resp) => {
-                bytes.put_u8(Tag::GetSlruSegment as u8);
-                bytes.put_u32((resp.segment.len() / BLCKSZ as usize) as u32);
-                bytes.put(&resp.segment[..]);
-            }
         }
 
         bytes.into()
@@ -962,14 +900,6 @@ impl PagestreamBeMessage {
                     let db_size = buf.read_i64::<BigEndian>()?;
                     Self::DbSize(PagestreamDbSizeResponse { db_size })
                 }
-                Tag::GetSlruSegment => {
-                    let n_blocks = buf.read_u32::<BigEndian>()?;
-                    let mut segment = vec![0; n_blocks as usize * BLCKSZ as usize];
-                    buf.read_exact(&mut segment)?;
-                    Self::GetSlruSegment(PagestreamGetSlruSegmentResponse {
-                        segment: segment.into(),
-                    })
-                }
             };
         let remaining = buf.into_inner();
         if !remaining.is_empty() {
@@ -988,7 +918,6 @@ impl PagestreamBeMessage {
             Self::GetPage(_) => "GetPage",
             Self::Error(_) => "Error",
             Self::DbSize(_) => "DbSize",
-            Self::GetSlruSegment(_) => "GetSlruSegment",
         }
     }
 }

libs/pageserver_api/src/reltag.rs

@@ -111,23 +111,9 @@ impl RelTag {
 /// These files are divided into segments, which are divided into
 /// pages of the same BLCKSZ as used for relation files.
 ///
-#[derive(
-    Debug,
-    Clone,
-    Copy,
-    Hash,
-    Serialize,
-    Deserialize,
-    PartialEq,
-    Eq,
-    PartialOrd,
-    Ord,
-    strum_macros::EnumIter,
-    strum_macros::FromRepr,
-)]
-#[repr(u8)]
+#[derive(Debug, Clone, Copy, Hash, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
 pub enum SlruKind {
-    Clog = 0,
+    Clog,
     MultiXactMembers,
     MultiXactOffsets,
 }

libs/postgres_ffi/src/xlog_utils.rs

@@ -207,16 +207,10 @@ pub fn find_end_of_wal(
                 let seg_offs = curr_lsn.segment_offset(wal_seg_size);
                 segment.seek(SeekFrom::Start(seg_offs as u64))?;
                 // loop inside segment
-                while curr_lsn.segment_number(wal_seg_size) == segno {
+                loop {
                     let bytes_read = segment.read(&mut buf)?;
                     if bytes_read == 0 {
-                        debug!(
-                            "find_end_of_wal reached end at {:?}, EOF in segment {:?} at offset {}",
-                            result,
-                            seg_file_path,
-                            curr_lsn.segment_offset(wal_seg_size)
-                        );
-                        return Ok(result);
+                        break; // EOF
                     }
                     curr_lsn += bytes_read as u64;
                     decoder.feed_bytes(&buf[0..bytes_read]);

libs/remote_storage/src/azure_blob.rs

@@ -8,7 +8,6 @@ use std::pin::Pin;
 use std::str::FromStr;
 use std::sync::Arc;
 use std::time::Duration;
-use std::time::SystemTime;
 
 use super::REMOTE_STORAGE_PREFIX_SEPARATOR;
 use anyhow::Result;
@@ -24,7 +23,6 @@ use futures::stream::Stream;
 use futures_util::StreamExt;
 use http_types::{StatusCode, Url};
 use tokio::time::Instant;
-use tokio_util::sync::CancellationToken;
 use tracing::debug;
 
 use crate::s3_bucket::RequestKind;
@@ -185,6 +183,7 @@ fn to_download_error(error: azure_core::Error) -> DownloadError {
     }
 }
 
+#[async_trait::async_trait]
 impl RemoteStorage for AzureBlobStorage {
     async fn list(
         &self,
@@ -372,20 +371,6 @@ impl RemoteStorage for AzureBlobStorage {
             copy_status = status;
         }
     }
-
-    async fn time_travel_recover(
-        &self,
-        _prefix: Option<&RemotePath>,
-        _timestamp: SystemTime,
-        _done_if_after: SystemTime,
-        _cancel: CancellationToken,
-    ) -> anyhow::Result<()> {
-        // TODO use Azure point in time recovery feature for this
-        // https://learn.microsoft.com/en-us/azure/storage/blobs/point-in-time-restore-overview
-        Err(anyhow::anyhow!(
-            "time travel recovery for azure blob storage is not implemented"
-        ))
-    }
 }
 
 pin_project_lite::pin_project! {

libs/remote_storage/src/lib.rs

@@ -25,7 +25,6 @@ use bytes::Bytes;
 use futures::stream::Stream;
 use serde::{Deserialize, Serialize};
 use tokio::sync::Semaphore;
-use tokio_util::sync::CancellationToken;
 use toml_edit::Item;
 use tracing::info;
 
@@ -143,7 +142,7 @@ pub struct Listing {
 /// Storage (potentially remote) API to manage its state.
 /// This storage tries to be unaware of any layered repository context,
 /// providing basic CRUD operations for storage files.
-#[allow(async_fn_in_trait)]
+#[async_trait::async_trait]
 pub trait RemoteStorage: Send + Sync + 'static {
     /// Lists all top level subdirectories for a given prefix
     /// Note: here we assume that if the prefix is passed it was obtained via remote_object_id
@@ -211,15 +210,6 @@ pub trait RemoteStorage: Send + Sync + 'static {
 
     /// Copy a remote object inside a bucket from one path to another.
     async fn copy(&self, from: &RemotePath, to: &RemotePath) -> anyhow::Result<()>;
-
-    /// Resets the content of everything with the given prefix to the given state
-    async fn time_travel_recover(
-        &self,
-        prefix: Option<&RemotePath>,
-        timestamp: SystemTime,
-        done_if_after: SystemTime,
-        cancel: CancellationToken,
-    ) -> anyhow::Result<()>;
 }
 
 pub type DownloadStream = Pin<Box<dyn Stream<Item = std::io::Result<Bytes>> + Unpin + Send + Sync>>;
@@ -272,15 +262,14 @@ impl std::error::Error for DownloadError {}
 /// Every storage, currently supported.
 /// Serves as a simple way to pass around the [`RemoteStorage`] without dealing with generics.
 #[derive(Clone)]
-// Require Clone for `Other` due to https://github.com/rust-lang/rust/issues/26925
-pub enum GenericRemoteStorage<Other: Clone = Arc<UnreliableWrapper>> {
+pub enum GenericRemoteStorage {
     LocalFs(LocalFs),
     AwsS3(Arc<S3Bucket>),
     AzureBlob(Arc<AzureBlobStorage>),
-    Unreliable(Other),
+    Unreliable(Arc<UnreliableWrapper>),
 }
 
-impl<Other: RemoteStorage> GenericRemoteStorage<Arc<Other>> {
+impl GenericRemoteStorage {
     pub async fn list(
         &self,
         prefix: Option<&RemotePath>,
@@ -397,33 +386,6 @@ impl<Other: RemoteStorage> GenericRemoteStorage<Arc<Other>> {
             Self::Unreliable(s) => s.copy(from, to).await,
         }
     }
-
-    pub async fn time_travel_recover(
-        &self,
-        prefix: Option<&RemotePath>,
-        timestamp: SystemTime,
-        done_if_after: SystemTime,
-        cancel: CancellationToken,
-    ) -> anyhow::Result<()> {
-        match self {
-            Self::LocalFs(s) => {
-                s.time_travel_recover(prefix, timestamp, done_if_after, cancel)
-                    .await
-            }
-            Self::AwsS3(s) => {
-                s.time_travel_recover(prefix, timestamp, done_if_after, cancel)
-                    .await
-            }
-            Self::AzureBlob(s) => {
-                s.time_travel_recover(prefix, timestamp, done_if_after, cancel)
-                    .await
-            }
-            Self::Unreliable(s) => {
-                s.time_travel_recover(prefix, timestamp, done_if_after, cancel)
-                    .await
-            }
-        }
-    }
 }
 
 impl GenericRemoteStorage {
@@ -434,12 +396,7 @@ impl GenericRemoteStorage {
                 Self::LocalFs(LocalFs::new(root.clone())?)
             }
             RemoteStorageKind::AwsS3(s3_config) => {
-                // The profile and access key id are only printed here for debugging purposes,
-                // their values don't indicate the eventually taken choice for auth.
-                let profile = std::env::var("AWS_PROFILE").unwrap_or_else(|_| "<none>".into());
-                let access_key_id =
-                    std::env::var("AWS_ACCESS_KEY_ID").unwrap_or_else(|_| "<none>".into());
-                info!("Using s3 bucket '{}' in region '{}' as a remote storage, prefix in bucket: '{:?}', bucket endpoint: '{:?}', profile: {profile}, access_key_id: {access_key_id}",
+                info!("Using s3 bucket '{}' in region '{}' as a remote storage, prefix in bucket: '{:?}', bucket endpoint: '{:?}'",
                       s3_config.bucket_name, s3_config.bucket_region, s3_config.prefix_in_bucket, s3_config.endpoint);
                 Self::AwsS3(Arc::new(S3Bucket::new(s3_config)?))
             }
@@ -716,7 +673,6 @@ impl ConcurrencyLimiter {
             RequestKind::List => &self.read,
             RequestKind::Delete => &self.write,
             RequestKind::Copy => &self.write,
-            RequestKind::TimeTravel => &self.write,
         }
     }
 

libs/remote_storage/src/local_fs.rs

@@ -4,7 +4,7 @@
 //! This storage used in tests, but can also be used in cases when a certain persistent
 //! volume is mounted to the local FS.
 
-use std::{borrow::Cow, future::Future, io::ErrorKind, pin::Pin, time::SystemTime};
+use std::{borrow::Cow, future::Future, io::ErrorKind, pin::Pin};
 
 use anyhow::{bail, ensure, Context};
 use bytes::Bytes;
@@ -14,7 +14,7 @@ use tokio::{
     fs,
     io::{self, AsyncReadExt, AsyncSeekExt, AsyncWriteExt},
 };
-use tokio_util::{io::ReaderStream, sync::CancellationToken};
+use tokio_util::io::ReaderStream;
 use tracing::*;
 use utils::{crashsafe::path_with_suffix_extension, fs_ext::is_directory_empty};
 
@@ -157,6 +157,7 @@ impl LocalFs {
     }
 }
 
+#[async_trait::async_trait]
 impl RemoteStorage for LocalFs {
     async fn list(
         &self,
@@ -422,17 +423,6 @@ impl RemoteStorage for LocalFs {
         })?;
         Ok(())
     }
-
-    #[allow(clippy::diverging_sub_expression)]
-    async fn time_travel_recover(
-        &self,
-        _prefix: Option<&RemotePath>,
-        _timestamp: SystemTime,
-        _done_if_after: SystemTime,
-        _cancel: CancellationToken,
-    ) -> anyhow::Result<()> {
-        unimplemented!()
-    }
 }
 
 fn storage_metadata_path(original_path: &Utf8Path) -> Utf8PathBuf {

libs/remote_storage/src/s3_bucket.rs

@@ -6,14 +6,12 @@
 
 use std::{
     borrow::Cow,
-    collections::HashMap,
     pin::Pin,
     sync::Arc,
     task::{Context, Poll},
-    time::SystemTime,
 };
 
-use anyhow::{anyhow, Context as _};
+use anyhow::Context as _;
 use aws_config::{
     environment::credentials::EnvironmentVariableCredentialsProvider,
     imds::credentials::ImdsCredentialsProvider,
@@ -29,19 +27,17 @@ use aws_sdk_s3::{
     config::{AsyncSleep, Builder, IdentityCache, Region, SharedAsyncSleep},
     error::SdkError,
     operation::get_object::GetObjectError,
-    types::{Delete, DeleteMarkerEntry, ObjectIdentifier, ObjectVersion},
+    types::{Delete, ObjectIdentifier},
     Client,
 };
 use aws_smithy_async::rt::sleep::TokioSleep;
 
+use aws_smithy_types::body::SdkBody;
 use aws_smithy_types::byte_stream::ByteStream;
-use aws_smithy_types::{body::SdkBody, DateTime};
 use bytes::Bytes;
 use futures::stream::Stream;
 use hyper::Body;
 use scopeguard::ScopeGuard;
-use tokio_util::sync::CancellationToken;
-use utils::backoff;
 
 use super::StorageMetadata;
 use crate::{
@@ -274,59 +270,6 @@ impl S3Bucket {
             }
         }
     }
-
-    async fn delete_oids(
-        &self,
-        kind: RequestKind,
-        delete_objects: &[ObjectIdentifier],
-    ) -> anyhow::Result<()> {
-        for chunk in delete_objects.chunks(MAX_KEYS_PER_DELETE) {
-            let started_at = start_measuring_requests(kind);
-
-            let resp = self
-                .client
-                .delete_objects()
-                .bucket(self.bucket_name.clone())
-                .delete(
-                    Delete::builder()
-                        .set_objects(Some(chunk.to_vec()))
-                        .build()?,
-                )
-                .send()
-                .await;
-
-            let started_at = ScopeGuard::into_inner(started_at);
-            metrics::BUCKET_METRICS
-                .req_seconds
-                .observe_elapsed(kind, &resp, started_at);
-
-            let resp = resp?;
-            metrics::BUCKET_METRICS
-                .deleted_objects_total
-                .inc_by(chunk.len() as u64);
-            if let Some(errors) = resp.errors {
-                // Log a bounded number of the errors within the response:
-                // these requests can carry 1000 keys so logging each one
-                // would be too verbose, especially as errors may lead us
-                // to retry repeatedly.
-                const LOG_UP_TO_N_ERRORS: usize = 10;
-                for e in errors.iter().take(LOG_UP_TO_N_ERRORS) {
-                    tracing::warn!(
-                        "DeleteObjects key {} failed: {}: {}",
-                        e.key.as_ref().map(Cow::from).unwrap_or("".into()),
-                        e.code.as_ref().map(Cow::from).unwrap_or("".into()),
-                        e.message.as_ref().map(Cow::from).unwrap_or("".into())
-                    );
-                }
-
-                return Err(anyhow::format_err!(
-                    "Failed to delete {} objects",
-                    errors.len()
-                ));
-            }
-        }
-        Ok(())
-    }
 }
 
 pin_project_lite::pin_project! {
@@ -430,6 +373,7 @@ impl<S: Stream<Item = std::io::Result<Bytes>>> Stream for TimedDownload<S> {
     }
 }
 
+#[async_trait::async_trait]
 impl RemoteStorage for S3Bucket {
     async fn list(
         &self,
@@ -625,208 +569,64 @@ impl RemoteStorage for S3Bucket {
             delete_objects.push(obj_id);
         }
 
-        self.delete_oids(kind, &delete_objects).await
+        for chunk in delete_objects.chunks(MAX_KEYS_PER_DELETE) {
+            let started_at = start_measuring_requests(kind);
+
+            let resp = self
+                .client
+                .delete_objects()
+                .bucket(self.bucket_name.clone())
+                .delete(
+                    Delete::builder()
+                        .set_objects(Some(chunk.to_vec()))
+                        .build()?,
+                )
+                .send()
+                .await;
+
+            let started_at = ScopeGuard::into_inner(started_at);
+            metrics::BUCKET_METRICS
+                .req_seconds
+                .observe_elapsed(kind, &resp, started_at);
+
+            match resp {
+                Ok(resp) => {
+                    metrics::BUCKET_METRICS
+                        .deleted_objects_total
+                        .inc_by(chunk.len() as u64);
+                    if let Some(errors) = resp.errors {
+                        // Log a bounded number of the errors within the response:
+                        // these requests can carry 1000 keys so logging each one
+                        // would be too verbose, especially as errors may lead us
+                        // to retry repeatedly.
+                        const LOG_UP_TO_N_ERRORS: usize = 10;
+                        for e in errors.iter().take(LOG_UP_TO_N_ERRORS) {
+                            tracing::warn!(
+                                "DeleteObjects key {} failed: {}: {}",
+                                e.key.as_ref().map(Cow::from).unwrap_or("".into()),
+                                e.code.as_ref().map(Cow::from).unwrap_or("".into()),
+                                e.message.as_ref().map(Cow::from).unwrap_or("".into())
+                            );
+                        }
+
+                        return Err(anyhow::format_err!(
+                            "Failed to delete {} objects",
+                            errors.len()
+                        ));
+                    }
+                }
+                Err(e) => {
+                    return Err(e.into());
+                }
+            }
+        }
+        Ok(())
     }
 
     async fn delete(&self, path: &RemotePath) -> anyhow::Result<()> {
         let paths = std::array::from_ref(path);
         self.delete_objects(paths).await
     }
-
-    async fn time_travel_recover(
-        &self,
-        prefix: Option<&RemotePath>,
-        timestamp: SystemTime,
-        done_if_after: SystemTime,
-        cancel: CancellationToken,
-    ) -> anyhow::Result<()> {
-        let kind = RequestKind::TimeTravel;
-        let _guard = self.permit(kind).await;
-
-        let timestamp = DateTime::from(timestamp);
-        let done_if_after = DateTime::from(done_if_after);
-
-        tracing::info!("Target time: {timestamp:?}, done_if_after {done_if_after:?}");
-
-        // get the passed prefix or if it is not set use prefix_in_bucket value
-        let prefix = prefix
-            .map(|p| self.relative_path_to_s3_object(p))
-            .or_else(|| self.prefix_in_bucket.clone());
-
-        let warn_threshold = 3;
-        let max_retries = 10;
-        let is_permanent = |_e: &_| false;
-
-        let mut key_marker = None;
-        let mut version_id_marker = None;
-        let mut versions_and_deletes = Vec::new();
-
-        loop {
-            let response = backoff::retry(
-                || async {
-                    Ok(self
-                        .client
-                        .list_object_versions()
-                        .bucket(self.bucket_name.clone())
-                        .set_prefix(prefix.clone())
-                        .set_key_marker(key_marker.clone())
-                        .set_version_id_marker(version_id_marker.clone())
-                        .send()
-                        .await?)
-                },
-                is_permanent,
-                warn_threshold,
-                max_retries,
-                "listing object versions for time_travel_recover",
-                backoff::Cancel::new(cancel.clone(), || anyhow!("Cancelled")),
-            )
-            .await?;
-
-            tracing::trace!(
-                "  Got List response version_id_marker={:?}, key_marker={:?}",
-                response.version_id_marker,
-                response.key_marker
-            );
-            let versions = response
-                .versions
-                .unwrap_or_default()
-                .into_iter()
-                .map(VerOrDelete::from_version);
-            let deletes = response
-                .delete_markers
-                .unwrap_or_default()
-                .into_iter()
-                .map(VerOrDelete::from_delete_marker);
-            itertools::process_results(versions.chain(deletes), |n_vds| {
-                versions_and_deletes.extend(n_vds)
-            })?;
-            fn none_if_empty(v: Option<String>) -> Option<String> {
-                v.filter(|v| !v.is_empty())
-            }
-            version_id_marker = none_if_empty(response.next_version_id_marker);
-            key_marker = none_if_empty(response.next_key_marker);
-            if version_id_marker.is_none() {
-                // The final response is not supposed to be truncated
-                if response.is_truncated.unwrap_or_default() {
-                    anyhow::bail!(
-                        "Received truncated ListObjectVersions response for prefix={prefix:?}"
-                    );
-                }
-                break;
-            }
-            // Limit the number of versions deletions, mostly so that we don't
-            // keep requesting forever if the list is too long, as we'd put the
-            // list in RAM.
-            // Building a list of 100k entries that reaches the limit roughly takes
-            // 40 seconds, and roughly corresponds to tenants of 2 TiB physical size.
-            const COMPLEXITY_LIMIT: usize = 100_000;
-            if versions_and_deletes.len() >= COMPLEXITY_LIMIT {
-                anyhow::bail!(
-                    "Limit for number of versions/deletions exceeded for prefix={prefix:?}"
-                );
-            }
-        }
-
-        // Work on the list of references instead of the objects directly,
-        // otherwise we get lifetime errors in the sort_by_key call below.
-        let mut versions_and_deletes = versions_and_deletes.iter().collect::<Vec<_>>();
-
-        versions_and_deletes.sort_by_key(|vd| (&vd.key, &vd.last_modified));
-
-        let mut vds_for_key = HashMap::<_, Vec<_>>::new();
-
-        for vd in &versions_and_deletes {
-            let VerOrDelete {
-                version_id, key, ..
-            } = &vd;
-            if version_id == "null" {
-                anyhow::bail!("Received ListVersions response for key={key} with version_id='null', \
-                    indicating either disabled versioning, or legacy objects with null version id values");
-            }
-            tracing::trace!(
-                "Parsing version key={key} version_id={version_id} kind={:?}",
-                vd.kind
-            );
-
-            vds_for_key.entry(key).or_default().push(vd);
-        }
-        for (key, versions) in vds_for_key {
-            let last_vd = versions.last().unwrap();
-            if last_vd.last_modified > done_if_after {
-                tracing::trace!("Key {key} has version later than done_if_after, skipping");
-                continue;
-            }
-            // the version we want to restore to.
-            let version_to_restore_to =
-                match versions.binary_search_by_key(&timestamp, |tpl| tpl.last_modified) {
-                    Ok(v) => v,
-                    Err(e) => e,
-                };
-            if version_to_restore_to == versions.len() {
-                tracing::trace!("Key {key} has no changes since timestamp, skipping");
-                continue;
-            }
-            let mut do_delete = false;
-            if version_to_restore_to == 0 {
-                // All versions more recent, so the key didn't exist at the specified time point.
-                tracing::trace!(
-                    "All {} versions more recent for {key}, deleting",
-                    versions.len()
-                );
-                do_delete = true;
-            } else {
-                match &versions[version_to_restore_to - 1] {
-                    VerOrDelete {
-                        kind: VerOrDeleteKind::Version,
-                        version_id,
-                        ..
-                    } => {
-                        tracing::trace!("Copying old version {version_id} for {key}...");
-                        // Restore the state to the last version by copying
-                        let source_id =
-                            format!("{}/{key}?versionId={version_id}", self.bucket_name);
-
-                        backoff::retry(
-                            || async {
-                                Ok(self
-                                    .client
-                                    .copy_object()
-                                    .bucket(self.bucket_name.clone())
-                                    .key(key)
-                                    .copy_source(&source_id)
-                                    .send()
-                                    .await?)
-                            },
-                            is_permanent,
-                            warn_threshold,
-                            max_retries,
-                            "listing object versions for time_travel_recover",
-                            backoff::Cancel::new(cancel.clone(), || anyhow!("Cancelled")),
-                        )
-                        .await?;
-                    }
-                    VerOrDelete {
-                        kind: VerOrDeleteKind::DeleteMarker,
-                        ..
-                    } => {
-                        do_delete = true;
-                    }
-                }
-            };
-            if do_delete {
-                if matches!(last_vd.kind, VerOrDeleteKind::DeleteMarker) {
-                    // Key has since been deleted (but there was some history), no need to do anything
-                    tracing::trace!("Key {key} already deleted, skipping.");
-                } else {
-                    tracing::trace!("Deleting {key}...");
-
-                    let oid = ObjectIdentifier::builder().key(key.to_owned()).build()?;
-                    self.delete_oids(kind, &[oid]).await?;
-                }
-            }
-        }
-        Ok(())
-    }
 }
 
 /// On drop (cancellation) count towards [`metrics::BucketMetrics::cancelled_waits`].
@@ -851,62 +651,6 @@ fn start_measuring_requests(
     })
 }
 
-// Save RAM and only store the needed data instead of the entire ObjectVersion/DeleteMarkerEntry
-struct VerOrDelete {
-    kind: VerOrDeleteKind,
-    last_modified: DateTime,
-    version_id: String,
-    key: String,
-}
-
-#[derive(Debug)]
-enum VerOrDeleteKind {
-    Version,
-    DeleteMarker,
-}
-
-impl VerOrDelete {
-    fn with_kind(
-        kind: VerOrDeleteKind,
-        last_modified: Option<DateTime>,
-        version_id: Option<String>,
-        key: Option<String>,
-    ) -> anyhow::Result<Self> {
-        let lvk = (last_modified, version_id, key);
-        let (Some(last_modified), Some(version_id), Some(key)) = lvk else {
-            anyhow::bail!(
-                "One (or more) of last_modified, key, and id is None. \
-            Is versioning enabled in the bucket? last_modified={:?}, version_id={:?}, key={:?}",
-                lvk.0,
-                lvk.1,
-                lvk.2,
-            );
-        };
-        Ok(Self {
-            kind,
-            last_modified,
-            version_id,
-            key,
-        })
-    }
-    fn from_version(v: ObjectVersion) -> anyhow::Result<Self> {
-        Self::with_kind(
-            VerOrDeleteKind::Version,
-            v.last_modified,
-            v.version_id,
-            v.key,
-        )
-    }
-    fn from_delete_marker(v: DeleteMarkerEntry) -> anyhow::Result<Self> {
-        Self::with_kind(
-            VerOrDeleteKind::DeleteMarker,
-            v.last_modified,
-            v.version_id,
-            v.key,
-        )
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use camino::Utf8Path;

libs/remote_storage/src/s3_bucket/metrics.rs

@@ -12,7 +12,6 @@ pub(crate) enum RequestKind {
     Delete = 2,
     List = 3,
     Copy = 4,
-    TimeTravel = 5,
 }
 
 use RequestKind::*;
@@ -25,7 +24,6 @@ impl RequestKind {
             Delete => "delete_object",
             List => "list_objects",
             Copy => "copy_object",
-            TimeTravel => "time_travel_recover",
         }
     }
     const fn as_index(&self) -> usize {
@@ -33,7 +31,7 @@ impl RequestKind {
     }
 }
 
-pub(super) struct RequestTyped<C>([C; 6]);
+pub(super) struct RequestTyped<C>([C; 5]);
 
 impl<C> RequestTyped<C> {
     pub(super) fn get(&self, kind: RequestKind) -> &C {
@@ -42,8 +40,8 @@ impl<C> RequestTyped<C> {
 
     fn build_with(mut f: impl FnMut(RequestKind) -> C) -> Self {
         use RequestKind::*;
-        let mut it = [Get, Put, Delete, List, Copy, TimeTravel].into_iter();
-        let arr = std::array::from_fn::<C, 6, _>(|index| {
+        let mut it = [Get, Put, Delete, List, Copy].into_iter();
+        let arr = std::array::from_fn::<C, 5, _>(|index| {
             let next = it.next().unwrap();
             assert_eq!(index, next.as_index());
             f(next)

libs/remote_storage/src/simulate_failures.rs

@@ -3,19 +3,16 @@
 //! testing purposes.
 use bytes::Bytes;
 use futures::stream::Stream;
+use std::collections::hash_map::Entry;
 use std::collections::HashMap;
 use std::sync::Mutex;
-use std::time::SystemTime;
-use std::{collections::hash_map::Entry, sync::Arc};
-use tokio_util::sync::CancellationToken;
 
 use crate::{
-    Download, DownloadError, GenericRemoteStorage, Listing, ListingMode, RemotePath, RemoteStorage,
-    StorageMetadata,
+    Download, DownloadError, Listing, ListingMode, RemotePath, RemoteStorage, StorageMetadata,
 };
 
 pub struct UnreliableWrapper {
-    inner: GenericRemoteStorage<Arc<VoidStorage>>,
+    inner: crate::GenericRemoteStorage,
 
     // This many attempts of each operation will fail, then we let it succeed.
     attempts_to_fail: u64,
@@ -32,21 +29,11 @@ enum RemoteOp {
     Download(RemotePath),
     Delete(RemotePath),
     DeleteObjects(Vec<RemotePath>),
-    TimeTravelRecover(Option<RemotePath>),
 }
 
 impl UnreliableWrapper {
     pub fn new(inner: crate::GenericRemoteStorage, attempts_to_fail: u64) -> Self {
         assert!(attempts_to_fail > 0);
-        let inner = match inner {
-            GenericRemoteStorage::AwsS3(s) => GenericRemoteStorage::AwsS3(s),
-            GenericRemoteStorage::AzureBlob(s) => GenericRemoteStorage::AzureBlob(s),
-            GenericRemoteStorage::LocalFs(s) => GenericRemoteStorage::LocalFs(s),
-            // We could also make this a no-op, as in, extract the inner of the passed generic remote storage
-            GenericRemoteStorage::Unreliable(_s) => {
-                panic!("Can't wrap unreliable wrapper unreliably")
-            }
-        };
         UnreliableWrapper {
             inner,
             attempts_to_fail,
@@ -97,9 +84,7 @@ impl UnreliableWrapper {
     }
 }
 
-// We never construct this, so the type is not important, just has to not be UnreliableWrapper and impl RemoteStorage.
-type VoidStorage = crate::LocalFs;
-
+#[async_trait::async_trait]
 impl RemoteStorage for UnreliableWrapper {
     async fn list_prefixes(
         &self,
@@ -184,17 +169,4 @@ impl RemoteStorage for UnreliableWrapper {
         self.attempt(RemoteOp::Upload(to.clone()))?;
         self.inner.copy_object(from, to).await
     }
-
-    async fn time_travel_recover(
-        &self,
-        prefix: Option<&RemotePath>,
-        timestamp: SystemTime,
-        done_if_after: SystemTime,
-        cancel: CancellationToken,
-    ) -> anyhow::Result<()> {
-        self.attempt(RemoteOp::TimeTravelRecover(prefix.map(|p| p.to_owned())))?;
-        self.inner
-            .time_travel_recover(prefix, timestamp, done_if_after, cancel)
-            .await
-    }
 }

libs/remote_storage/tests/test_real_s3.rs

@@ -1,21 +1,15 @@
+use std::collections::HashSet;
 use std::env;
-use std::fmt::{Debug, Display};
 use std::num::NonZeroUsize;
 use std::ops::ControlFlow;
 use std::sync::Arc;
-use std::time::{Duration, UNIX_EPOCH};
-use std::{collections::HashSet, time::SystemTime};
+use std::time::UNIX_EPOCH;
 
-use crate::common::{download_to_vec, upload_stream};
 use anyhow::Context;
-use camino::Utf8Path;
-use futures_util::Future;
 use remote_storage::{
     GenericRemoteStorage, RemotePath, RemoteStorageConfig, RemoteStorageKind, S3Config,
 };
-use test_context::test_context;
 use test_context::AsyncTestContext;
-use tokio_util::sync::CancellationToken;
 use tracing::info;
 
 mod common;
@@ -24,160 +18,11 @@ mod common;
 mod tests_s3;
 
 use common::{cleanup, ensure_logging_ready, upload_remote_data, upload_simple_remote_data};
-use utils::backoff;
 
 const ENABLE_REAL_S3_REMOTE_STORAGE_ENV_VAR_NAME: &str = "ENABLE_REAL_S3_REMOTE_STORAGE";
 
 const BASE_PREFIX: &str = "test";
 
-#[test_context(MaybeEnabledStorage)]
-#[tokio::test]
-async fn s3_time_travel_recovery_works(ctx: &mut MaybeEnabledStorage) -> anyhow::Result<()> {
-    let ctx = match ctx {
-        MaybeEnabledStorage::Enabled(ctx) => ctx,
-        MaybeEnabledStorage::Disabled => return Ok(()),
-    };
-    // Our test depends on discrepancies in the clock between S3 and the environment the tests
-    // run in. Therefore, wait a little bit before and after. The alternative would be
-    // to take the time from S3 response headers.
-    const WAIT_TIME: Duration = Duration::from_millis(3_000);
-
-    async fn retry<T, O, F, E>(op: O) -> Result<T, E>
-    where
-        E: Display + Debug + 'static,
-        O: FnMut() -> F,
-        F: Future<Output = Result<T, E>>,
-    {
-        let warn_threshold = 3;
-        let max_retries = 10;
-        backoff::retry(
-            op,
-            |_e| false,
-            warn_threshold,
-            max_retries,
-            "test retry",
-            backoff::Cancel::new(CancellationToken::new(), || unreachable!()),
-        )
-        .await
-    }
-
-    async fn time_point() -> SystemTime {
-        tokio::time::sleep(WAIT_TIME).await;
-        let ret = SystemTime::now();
-        tokio::time::sleep(WAIT_TIME).await;
-        ret
-    }
-
-    async fn list_files(client: &Arc<GenericRemoteStorage>) -> anyhow::Result<HashSet<RemotePath>> {
-        Ok(retry(|| client.list_files(None))
-            .await
-            .context("list root files failure")?
-            .into_iter()
-            .collect::<HashSet<_>>())
-    }
-
-    let path1 = RemotePath::new(Utf8Path::new(format!("{}/path1", ctx.base_prefix).as_str()))
-        .with_context(|| "RemotePath conversion")?;
-
-    let path2 = RemotePath::new(Utf8Path::new(format!("{}/path2", ctx.base_prefix).as_str()))
-        .with_context(|| "RemotePath conversion")?;
-
-    let path3 = RemotePath::new(Utf8Path::new(format!("{}/path3", ctx.base_prefix).as_str()))
-        .with_context(|| "RemotePath conversion")?;
-
-    retry(|| {
-        let (data, len) = upload_stream("remote blob data1".as_bytes().into());
-        ctx.client.upload(data, len, &path1, None)
-    })
-    .await?;
-
-    let t0_files = list_files(&ctx.client).await?;
-    let t0 = time_point().await;
-    println!("at t0: {t0_files:?}");
-
-    let old_data = "remote blob data2";
-
-    retry(|| {
-        let (data, len) = upload_stream(old_data.as_bytes().into());
-        ctx.client.upload(data, len, &path2, None)
-    })
-    .await?;
-
-    let t1_files = list_files(&ctx.client).await?;
-    let t1 = time_point().await;
-    println!("at t1: {t1_files:?}");
-
-    // A little check to ensure that our clock is not too far off from the S3 clock
-    {
-        let dl = retry(|| ctx.client.download(&path2)).await?;
-        let last_modified = dl.last_modified.unwrap();
-        let half_wt = WAIT_TIME.mul_f32(0.5);
-        let t0_hwt = t0 + half_wt;
-        let t1_hwt = t1 - half_wt;
-        if !(t0_hwt..=t1_hwt).contains(&last_modified) {
-            panic!("last_modified={last_modified:?} is not between t0_hwt={t0_hwt:?} and t1_hwt={t1_hwt:?}. \
-                This likely means a large lock discrepancy between S3 and the local clock.");
-        }
-    }
-
-    retry(|| {
-        let (data, len) = upload_stream("remote blob data3".as_bytes().into());
-        ctx.client.upload(data, len, &path3, None)
-    })
-    .await?;
-
-    let new_data = "new remote blob data2";
-
-    retry(|| {
-        let (data, len) = upload_stream(new_data.as_bytes().into());
-        ctx.client.upload(data, len, &path2, None)
-    })
-    .await?;
-
-    retry(|| ctx.client.delete(&path1)).await?;
-    let t2_files = list_files(&ctx.client).await?;
-    let t2 = time_point().await;
-    println!("at t2: {t2_files:?}");
-
-    // No changes after recovery to t2 (no-op)
-    let t_final = time_point().await;
-    ctx.client
-        .time_travel_recover(None, t2, t_final, CancellationToken::new())
-        .await?;
-    let t2_files_recovered = list_files(&ctx.client).await?;
-    println!("after recovery to t2: {t2_files_recovered:?}");
-    assert_eq!(t2_files, t2_files_recovered);
-    let path2_recovered_t2 = download_to_vec(ctx.client.download(&path2).await?).await?;
-    assert_eq!(path2_recovered_t2, new_data.as_bytes());
-
-    // after recovery to t1: path1 is back, path2 has the old content
-    let t_final = time_point().await;
-    ctx.client
-        .time_travel_recover(None, t1, t_final, CancellationToken::new())
-        .await?;
-    let t1_files_recovered = list_files(&ctx.client).await?;
-    println!("after recovery to t1: {t1_files_recovered:?}");
-    assert_eq!(t1_files, t1_files_recovered);
-    let path2_recovered_t1 = download_to_vec(ctx.client.download(&path2).await?).await?;
-    assert_eq!(path2_recovered_t1, old_data.as_bytes());
-
-    // after recovery to t0: everything is gone except for path1
-    let t_final = time_point().await;
-    ctx.client
-        .time_travel_recover(None, t0, t_final, CancellationToken::new())
-        .await?;
-    let t0_files_recovered = list_files(&ctx.client).await?;
-    println!("after recovery to t0: {t0_files_recovered:?}");
-    assert_eq!(t0_files, t0_files_recovered);
-
-    // cleanup
-
-    let paths = &[path1, path2, path3];
-    retry(|| ctx.client.delete_objects(paths)).await?;
-
-    Ok(())
-}
-
 struct EnabledS3 {
     client: Arc<GenericRemoteStorage>,
     base_prefix: &'static str,

libs/utils/src/crashsafe.rs

@@ -112,55 +112,6 @@ pub async fn fsync_async(path: impl AsRef<Utf8Path>) -> Result<(), std::io::Erro
     tokio::fs::File::open(path.as_ref()).await?.sync_all().await
 }
 
-pub async fn fsync_async_opt(
-    path: impl AsRef<Utf8Path>,
-    do_fsync: bool,
-) -> Result<(), std::io::Error> {
-    if do_fsync {
-        fsync_async(path.as_ref()).await?;
-    }
-    Ok(())
-}
-
-/// Like postgres' durable_rename, renames file issuing fsyncs do make it
-/// durable. After return, file and rename are guaranteed to be persisted.
-///
-/// Unlike postgres, it only does fsyncs to 1) file to be renamed to make
-/// contents durable; 2) its directory entry to make rename durable 3) again to
-/// already renamed file, which is not required by standards but postgres does
-/// it, let's stick to that. Postgres additionally fsyncs newpath *before*
-/// rename if it exists to ensure that at least one of the files survives, but
-/// current callers don't need that.
-///
-/// virtual_file.rs has similar code, but it doesn't use vfs.
-///
-/// Useful links: <https://lwn.net/Articles/457667/>
-/// <https://www.postgresql.org/message-id/flat/56583BDD.9060302%402ndquadrant.com>
-/// <https://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/>
-pub async fn durable_rename(
-    old_path: impl AsRef<Utf8Path>,
-    new_path: impl AsRef<Utf8Path>,
-    do_fsync: bool,
-) -> io::Result<()> {
-    // first fsync the file
-    fsync_async_opt(old_path.as_ref(), do_fsync).await?;
-
-    // Time to do the real deal.
-    tokio::fs::rename(old_path.as_ref(), new_path.as_ref()).await?;
-
-    // Postgres'ish fsync of renamed file.
-    fsync_async_opt(new_path.as_ref(), do_fsync).await?;
-
-    // Now fsync the parent
-    let parent = match new_path.as_ref().parent() {
-        Some(p) => p,
-        None => Utf8Path::new("./"), // assume current dir if there is no parent
-    };
-    fsync_async_opt(parent, do_fsync).await?;
-
-    Ok(())
-}
-
 #[cfg(test)]
 mod tests {
 

libs/utils/src/http/error.rs

@@ -131,9 +131,7 @@ pub fn api_error_handler(api_error: ApiError) -> Response<Body> {
         ApiError::ResourceUnavailable(_) => info!("Error processing HTTP request: {api_error:#}"),
         ApiError::NotFound(_) => info!("Error processing HTTP request: {api_error:#}"),
         ApiError::InternalServerError(_) => error!("Error processing HTTP request: {api_error:?}"),
-        ApiError::ShuttingDown => info!("Shut down while processing HTTP request"),
-        ApiError::Timeout(_) => info!("Timeout while processing HTTP request: {api_error:#}"),
-        _ => info!("Error processing HTTP request: {api_error:#}"),
+        _ => error!("Error processing HTTP request: {api_error:#}"),
     }
 
     api_error.into_response()

libs/utils/src/nonblock.rs

@@ -5,10 +5,10 @@ use std::os::unix::io::RawFd;
 pub fn set_nonblock(fd: RawFd) -> Result<(), std::io::Error> {
     let bits = fcntl(fd, F_GETFL)?;
 
-    // If F_GETFL returns some unknown bits, they should be valid
+    // Safety: If F_GETFL returns some unknown bits, they should be valid
     // for passing back to F_SETFL, too. If we left them out, the F_SETFL
     // would effectively clear them, which is not what we want.
-    let mut flags = OFlag::from_bits_retain(bits);
+    let mut flags = unsafe { OFlag::from_bits_unchecked(bits) };
     flags |= OFlag::O_NONBLOCK;
 
     fcntl(fd, F_SETFL(flags))?;

libs/utils/src/sync/gate.rs

@@ -1,10 +1,4 @@
-use std::{
-    sync::{
-        atomic::{AtomicBool, Ordering},
-        Arc,
-    },
-    time::Duration,
-};
+use std::{sync::Arc, time::Duration};
 
 /// Gates are a concurrency helper, primarily used for implementing safe shutdown.
 ///
@@ -12,70 +6,62 @@ use std::{
 /// the resource calls `close()` when they want to ensure that all holders of guards
 /// have released them, and that no future guards will be issued.
 pub struct Gate {
-    inner: Arc<GateInner>,
+    /// Each caller of enter() takes one unit from the semaphore. In close(), we
+    /// take all the units to ensure all GateGuards are destroyed.
+    sem: Arc<tokio::sync::Semaphore>,
+
+    /// For observability only: a name that will be used to log warnings if a particular
+    /// gate is holding up shutdown
+    name: String,
 }
 
 impl std::fmt::Debug for Gate {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.debug_struct("Gate")
-            // use this for identification
-            .field("ptr", &Arc::as_ptr(&self.inner))
-            .field("inner", &self.inner)
-            .finish()
-    }
-}
-
-struct GateInner {
-    sem: tokio::sync::Semaphore,
-    closing: std::sync::atomic::AtomicBool,
-}
-
-impl std::fmt::Debug for GateInner {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let avail = self.sem.available_permits();
-
-        let guards = u32::try_from(avail)
-            .ok()
-            // the sem only supports 32-bit ish amount, but lets play it safe
-            .and_then(|x| Gate::MAX_UNITS.checked_sub(x));
-
-        let closing = self.closing.load(Ordering::Relaxed);
-
-        if let Some(guards) = guards {
-            f.debug_struct("Gate")
-                .field("remaining_guards", &guards)
-                .field("closing", &closing)
-                .finish()
-        } else {
-            f.debug_struct("Gate")
-                .field("avail_permits", &avail)
-                .field("closing", &closing)
-                .finish()
-        }
+        write!(f, "Gate<{}>", self.name)
     }
 }
 
 /// RAII guard for a [`Gate`]: as long as this exists, calls to [`Gate::close`] will
 /// not complete.
 #[derive(Debug)]
-pub struct GateGuard {
-    // Record the span where the gate was entered, so that we can identify who was blocking Gate::close
-    span_at_enter: tracing::Span,
-    gate: Arc<GateInner>,
-}
+pub struct GateGuard(tokio::sync::OwnedSemaphorePermit);
 
-impl Drop for GateGuard {
-    fn drop(&mut self) {
-        if self.gate.closing.load(Ordering::Relaxed) {
-            self.span_at_enter.in_scope(
-                || tracing::info!(gate = ?Arc::as_ptr(&self.gate), "kept the gate from closing"),
-            );
+/// Observability helper: every `warn_period`, emit a log warning that we're still waiting on this gate
+async fn warn_if_stuck<Fut: std::future::Future>(
+    fut: Fut,
+    name: &str,
+    warn_period: std::time::Duration,
+) -> <Fut as std::future::Future>::Output {
+    let started = std::time::Instant::now();
+
+    let mut fut = std::pin::pin!(fut);
+
+    let mut warned = false;
+    let ret = loop {
+        match tokio::time::timeout(warn_period, &mut fut).await {
+            Ok(ret) => break ret,
+            Err(_) => {
+                tracing::warn!(
+                    gate = name,
+                    elapsed_ms = started.elapsed().as_millis(),
+                    "still waiting, taking longer than expected..."
+                );
+                warned = true;
+            }
         }
+    };
 
-        // when the permit was acquired, it was forgotten to allow us to manage it's lifecycle
-        // manually, so "return" the permit now.
-        self.gate.sem.add_permits(1);
+    // If we emitted a warning for slowness, also emit a message when we complete, so that
+    // someone debugging a shutdown can know for sure whether we have moved past this operation.
+    if warned {
+        tracing::info!(
+            gate = name,
+            elapsed_ms = started.elapsed().as_millis(),
+            "completed, after taking longer than expected"
+        )
     }
+
+    ret
 }
 
 #[derive(Debug)]
@@ -83,20 +69,16 @@ pub enum GateError {
     GateClosed,
 }
 
-impl Default for Gate {
-    fn default() -> Self {
-        Self {
-            inner: Arc::new(GateInner {
-                sem: tokio::sync::Semaphore::new(Self::MAX_UNITS as usize),
-                closing: AtomicBool::new(false),
-            }),
-        }
-    }
-}
-
 impl Gate {
     const MAX_UNITS: u32 = u32::MAX;
 
+    pub fn new(name: String) -> Self {
+        Self {
+            sem: Arc::new(tokio::sync::Semaphore::new(Self::MAX_UNITS as usize)),
+            name,
+        }
+    }
+
     /// Acquire a guard that will prevent close() calls from completing. If close()
     /// was already called, this will return an error which should be interpreted
     /// as "shutting down".
@@ -106,23 +88,11 @@ impl Gate {
     /// to avoid blocking close() indefinitely: typically types that contain a Gate will
     /// also contain a CancellationToken.
     pub fn enter(&self) -> Result<GateGuard, GateError> {
-        let permit = self
-            .inner
-            .sem
-            .try_acquire()
-            .map_err(|_| GateError::GateClosed)?;
-
-        // we now have the permit, let's disable the normal raii functionality and leave
-        // "returning" the permit to our GateGuard::drop.
-        //
-        // this is done to avoid the need for multiple Arcs (one for semaphore, next for other
-        // fields).
-        permit.forget();
-
-        Ok(GateGuard {
-            span_at_enter: tracing::Span::current(),
-            gate: self.inner.clone(),
-        })
+        self.sem
+            .clone()
+            .try_acquire_owned()
+            .map(GateGuard)
+            .map_err(|_| GateError::GateClosed)
     }
 
     /// Types with a shutdown() method and a gate should call this method at the
@@ -132,88 +102,48 @@ impl Gate {
     /// important that the holders of such guards are respecting a CancellationToken which has
     /// been cancelled before entering this function.
     pub async fn close(&self) {
-        let started_at = std::time::Instant::now();
-        let mut do_close = std::pin::pin!(self.do_close());
-
-        let nag_after = Duration::from_secs(1);
-
-        let Err(_timeout) = tokio::time::timeout(nag_after, &mut do_close).await else {
-            return;
-        };
-
-        tracing::info!(
-            gate = ?self.as_ptr(),
-            elapsed_ms = started_at.elapsed().as_millis(),
-            "closing is taking longer than expected"
-        );
-
-        // close operation is not trying to be cancellation safe as pageserver does not need it.
-        //
-        // note: "closing" is not checked in Gate::enter -- it exists just for observability,
-        // dropping of GateGuard after this will log who they were.
-        self.inner.closing.store(true, Ordering::Relaxed);
-
-        do_close.await;
-
-        tracing::info!(
-            gate = ?self.as_ptr(),
-            elapsed_ms = started_at.elapsed().as_millis(),
-            "close completed"
-        );
-    }
-
-    /// Used as an identity of a gate. This identity will be resolved to something useful when
-    /// it's actually closed in a hopefully sensible `tracing::Span` which will describe it even
-    /// more.
-    ///
-    /// `GateGuard::drop` also logs this pointer when it has realized it has been keeping the gate
-    /// open for too long.
-    fn as_ptr(&self) -> *const GateInner {
-        Arc::as_ptr(&self.inner)
+        warn_if_stuck(self.do_close(), &self.name, Duration::from_millis(1000)).await
     }
 
     /// Check if [`Self::close()`] has finished waiting for all [`Self::enter()`] users to finish.  This
     /// is usually analoguous for "Did shutdown finish?" for types that include a Gate, whereas checking
     /// the CancellationToken on such types is analogous to "Did shutdown start?"
     pub fn close_complete(&self) -> bool {
-        self.inner.sem.is_closed()
+        self.sem.is_closed()
     }
 
-    #[tracing::instrument(level = tracing::Level::DEBUG, skip_all, fields(gate = ?self.as_ptr()))]
     async fn do_close(&self) {
-        tracing::debug!("Closing Gate...");
-
-        match self.inner.sem.acquire_many(Self::MAX_UNITS).await {
-            Ok(_permit) => {
+        tracing::debug!(gate = self.name, "Closing Gate...");
+        match self.sem.acquire_many(Self::MAX_UNITS).await {
+            Ok(_units) => {
                 // While holding all units, close the semaphore.  All subsequent calls to enter() will fail.
-                self.inner.sem.close();
+                self.sem.close();
             }
-            Err(_closed) => {
+            Err(_) => {
                 // Semaphore closed: we are the only function that can do this, so it indicates a double-call.
                 // This is legal.  Timeline::shutdown for example is not protected from being called more than
                 // once.
-                tracing::debug!("Double close")
+                tracing::debug!(gate = self.name, "Double close")
             }
         }
-        tracing::debug!("Closed Gate.")
+        tracing::debug!(gate = self.name, "Closed Gate.")
     }
 }
 
 #[cfg(test)]
 mod tests {
+    use futures::FutureExt;
+
     use super::*;
 
     #[tokio::test]
-    async fn close_unused() {
-        // Having taken no guards, we should not be blocked in close
-        let gate = Gate::default();
+    async fn test_idle_gate() {
+        // Having taken no gates, we should not be blocked in close
+        let gate = Gate::new("test".to_string());
         gate.close().await;
-    }
 
-    #[tokio::test]
-    async fn close_idle() {
         // If a guard is dropped before entering, close should not be blocked
-        let gate = Gate::default();
+        let gate = Gate::new("test".to_string());
         let guard = gate.enter().unwrap();
         drop(guard);
         gate.close().await;
@@ -222,30 +152,25 @@ mod tests {
         gate.enter().expect_err("enter should fail after close");
     }
 
-    #[tokio::test(start_paused = true)]
-    async fn close_busy_gate() {
-        let gate = Gate::default();
-        let forever = Duration::from_secs(24 * 7 * 365);
+    #[tokio::test]
+    async fn test_busy_gate() {
+        let gate = Gate::new("test".to_string());
 
-        let guard =
-            tracing::info_span!("i am holding back the gate").in_scope(|| gate.enter().unwrap());
+        let guard = gate.enter().unwrap();
 
         let mut close_fut = std::pin::pin!(gate.close());
 
-        // Close should be waiting for guards to drop
-        tokio::time::timeout(forever, &mut close_fut)
-            .await
-            .unwrap_err();
+        // Close should be blocked
+        assert!(close_fut.as_mut().now_or_never().is_none());
 
         // Attempting to enter() should fail, even though close isn't done yet.
         gate.enter()
             .expect_err("enter should fail after entering close");
 
-        // this will now log, which we cannot verify except manually
         drop(guard);
 
         // Guard is gone, close should finish
-        close_fut.await;
+        assert!(close_fut.as_mut().now_or_never().is_some());
 
         // Attempting to enter() is still forbidden
         gate.enter().expect_err("enter should fail finishing close");

libs/utils/src/tcp_listener.rs

@@ -1,6 +1,7 @@
 use std::{
     io,
     net::{TcpListener, ToSocketAddrs},
+    os::unix::prelude::AsRawFd,
 };
 
 use nix::sys::socket::{setsockopt, sockopt::ReuseAddr};
@@ -9,7 +10,7 @@ use nix::sys::socket::{setsockopt, sockopt::ReuseAddr};
 pub fn bind<A: ToSocketAddrs>(addr: A) -> io::Result<TcpListener> {
     let listener = TcpListener::bind(addr)?;
 
-    setsockopt(&listener, ReuseAddr, &true)?;
+    setsockopt(listener.as_raw_fd(), ReuseAddr, &true)?;
 
     Ok(listener)
 }

pageserver/Cargo.toml

@@ -21,6 +21,7 @@ camino.workspace = true
 camino-tempfile.workspace = true
 chrono = { workspace = true, features = ["serde"] }
 clap = { workspace = true, features = ["string"] }
+close_fds.workspace = true
 const_format.workspace = true
 consumption_metrics.workspace = true
 crc32c.workspace = true
@@ -60,7 +61,6 @@ sync_wrapper.workspace = true
 tokio-tar.workspace = true
 thiserror.workspace = true
 tokio = { workspace = true, features = ["process", "sync", "fs", "rt", "io-util", "time"] }
-tokio-epoll-uring.workspace = true
 tokio-io-timeout.workspace = true
 tokio-postgres.workspace = true
 tokio-stream.workspace = true

pageserver/client/src/mgmt_api.rs

@@ -69,25 +69,6 @@ impl Client {
         resp.json().await.map_err(Error::ReceiveBody)
     }
 
-    /// Get an arbitrary path and returning a streaming Response.  This function is suitable
-    /// for pass-through/proxy use cases where we don't care what the response content looks
-    /// like.
-    ///
-    /// Use/add one of the properly typed methods below if you know aren't proxying, and
-    /// know what kind of response you expect.
-    pub async fn get_raw(&self, path: String) -> Result<reqwest::Response> {
-        debug_assert!(path.starts_with('/'));
-        let uri = format!("{}{}", self.mgmt_api_endpoint, path);
-
-        let req = self.client.request(Method::GET, uri);
-        let req = if let Some(value) = &self.authorization_header {
-            req.header(reqwest::header::AUTHORIZATION, value)
-        } else {
-            req
-        };
-        req.send().await.map_err(Error::ReceiveBody)
-    }
-
     pub async fn tenant_details(
         &self,
         tenant_shard_id: TenantShardId,
@@ -190,25 +171,6 @@ impl Client {
             .map_err(Error::ReceiveBody)
     }
 
-    /// The tenant deletion API can return 202 if deletion is incomplete, or
-    /// 404 if it is complete.  Callers are responsible for checking the status
-    /// code and retrying.  Error codes other than 404 will return Err().
-    pub async fn tenant_delete(&self, tenant_shard_id: TenantShardId) -> Result<StatusCode> {
-        let uri = format!("{}/v1/tenant/{tenant_shard_id}", self.mgmt_api_endpoint);
-
-        match self.request(Method::DELETE, &uri, ()).await {
-            Err(Error::ApiError(status_code, msg)) => {
-                if status_code == StatusCode::NOT_FOUND {
-                    Ok(StatusCode::NOT_FOUND)
-                } else {
-                    Err(Error::ApiError(status_code, msg))
-                }
-            }
-            Err(e) => Err(e),
-            Ok(response) => Ok(response.status()),
-        }
-    }
-
     pub async fn tenant_config(&self, req: &TenantConfigRequest) -> Result<()> {
         let uri = format!("{}/v1/tenant/config", self.mgmt_api_endpoint);
         self.request(Method::PUT, &uri, req).await?;
@@ -272,32 +234,6 @@ impl Client {
             .map_err(Error::ReceiveBody)
     }
 
-    /// The timeline deletion API can return 201 if deletion is incomplete, or
-    /// 403 if it is complete.  Callers are responsible for checking the status
-    /// code and retrying.  Error codes other than 403 will return Err().
-    pub async fn timeline_delete(
-        &self,
-        tenant_shard_id: TenantShardId,
-        timeline_id: TimelineId,
-    ) -> Result<StatusCode> {
-        let uri = format!(
-            "{}/v1/tenant/{tenant_shard_id}/timeline/{timeline_id}",
-            self.mgmt_api_endpoint
-        );
-
-        match self.request(Method::DELETE, &uri, ()).await {
-            Err(Error::ApiError(status_code, msg)) => {
-                if status_code == StatusCode::NOT_FOUND {
-                    Ok(StatusCode::NOT_FOUND)
-                } else {
-                    Err(Error::ApiError(status_code, msg))
-                }
-            }
-            Err(e) => Err(e),
-            Ok(response) => Ok(response.status()),
-        }
-    }
-
     pub async fn tenant_reset(&self, tenant_shard_id: TenantShardId) -> Result<()> {
         let uri = format!(
             "{}/v1/tenant/{}/reset",

pageserver/client/src/page_service.rs

@@ -156,8 +156,7 @@ impl PagestreamClient {
             PagestreamBeMessage::Error(e) => anyhow::bail!("Error: {:?}", e),
             PagestreamBeMessage::Exists(_)
             | PagestreamBeMessage::Nblocks(_)
-            | PagestreamBeMessage::DbSize(_)
-            | PagestreamBeMessage::GetSlruSegment(_) => {
+            | PagestreamBeMessage::DbSize(_) => {
                 anyhow::bail!(
                     "unexpected be message kind in response to getpage request: {}",
                     msg.kind()

pageserver/ctl/src/layer_map_analyzer.rs

@@ -18,7 +18,7 @@ use pageserver::tenant::block_io::FileBlockReader;
 use pageserver::tenant::disk_btree::{DiskBtreeReader, VisitDirection};
 use pageserver::tenant::storage_layer::delta_layer::{Summary, DELTA_KEY_SIZE};
 use pageserver::tenant::storage_layer::range_overlaps;
-use pageserver::virtual_file::{self, VirtualFile};
+use pageserver::virtual_file::VirtualFile;
 
 use utils::{bin_ser::BeSer, lsn::Lsn};
 
@@ -142,7 +142,7 @@ pub(crate) async fn main(cmd: &AnalyzeLayerMapCmd) -> Result<()> {
     let ctx = RequestContext::new(TaskKind::DebugTool, DownloadBehavior::Error);
 
     // Initialize virtual_file (file desriptor cache) and page cache which are needed to access layer persistent B-Tree.
-    pageserver::virtual_file::init(10, virtual_file::IoEngineKind::StdFs);
+    pageserver::virtual_file::init(10);
     pageserver::page_cache::init(100);
 
     let mut total_delta_layers = 0usize;

pageserver/ctl/src/layers.rs

@@ -59,7 +59,7 @@ pub(crate) enum LayerCmd {
 
 async fn read_delta_file(path: impl AsRef<Path>, ctx: &RequestContext) -> Result<()> {
     let path = Utf8Path::from_path(path.as_ref()).expect("non-Unicode path");
-    virtual_file::init(10, virtual_file::IoEngineKind::StdFs);
+    virtual_file::init(10);
     page_cache::init(100);
     let file = FileBlockReader::new(VirtualFile::open(path).await?);
     let summary_blk = file.read_blk(0, ctx).await?;
@@ -187,7 +187,7 @@ pub(crate) async fn main(cmd: &LayerCmd) -> Result<()> {
             new_tenant_id,
             new_timeline_id,
         } => {
-            pageserver::virtual_file::init(10, virtual_file::IoEngineKind::StdFs);
+            pageserver::virtual_file::init(10);
             pageserver::page_cache::init(100);
 
             let ctx = RequestContext::new(TaskKind::DebugTool, DownloadBehavior::Error);

pageserver/ctl/src/main.rs

@@ -123,7 +123,7 @@ fn read_pg_control_file(control_file_path: &Utf8Path) -> anyhow::Result<()> {
 
 async fn print_layerfile(path: &Utf8Path) -> anyhow::Result<()> {
     // Basic initialization of things that don't change after startup
-    virtual_file::init(10, virtual_file::IoEngineKind::StdFs);
+    virtual_file::init(10);
     page_cache::init(100);
     let ctx = RequestContext::new(TaskKind::DebugTool, DownloadBehavior::Error);
     dump_layerfile_from_path(path, true, &ctx).await

pageserver/pagebench/src/cmd/getpage_latest_lsn.rs

@@ -423,8 +423,8 @@ async fn client(
     tokio::select! {
         res = do_requests => { res },
         _ = cancel.cancelled() => {
-            // fallthrough to shutdown
+            client.shutdown().await;
+            return;
         }
     }
-    client.shutdown().await;
 }

pageserver/pagebench/src/util/request_stats.rs

@@ -66,10 +66,13 @@ impl serde::Serialize for LatencyPercentiles {
     {
         use serde::ser::SerializeMap;
         let mut ser = serializer.serialize_map(Some(LATENCY_PERCENTILES.len()))?;
-        for (p, v) in LATENCY_PERCENTILES.iter().zip(&self.latency_percentiles) {
+        for p in LATENCY_PERCENTILES {
             ser.serialize_entry(
                 &format!("p{p}"),
-                &format!("{}", humantime::format_duration(*v)),
+                &format!(
+                    "{}",
+                    &humantime::format_duration(self.latency_percentiles[0])
+                ),
             )?;
         }
         ser.end()

pageserver/src/basebackup.rs

@@ -11,9 +11,8 @@
 //! from data stored in object storage.
 //!
 use anyhow::{anyhow, bail, ensure, Context};
-use bytes::{BufMut, Bytes, BytesMut};
+use bytes::{BufMut, BytesMut};
 use fail::fail_point;
-use pageserver_api::key::{key_to_slru_block, Key};
 use postgres_ffi::pg_constants;
 use std::fmt::Write as FmtWrite;
 use std::time::SystemTime;
@@ -134,87 +133,6 @@ where
     ctx: &'a RequestContext,
 }
 
-/// A sink that accepts SLRU blocks ordered by key and forwards
-/// full segments to the archive.
-struct SlruSegmentsBuilder<'a, 'b, W>
-where
-    W: AsyncWrite + Send + Sync + Unpin,
-{
-    ar: &'a mut Builder<&'b mut W>,
-    buf: Vec<u8>,
-    current_segment: Option<(SlruKind, u32)>,
-}
-
-impl<'a, 'b, W> SlruSegmentsBuilder<'a, 'b, W>
-where
-    W: AsyncWrite + Send + Sync + Unpin,
-{
-    fn new(ar: &'a mut Builder<&'b mut W>) -> Self {
-        Self {
-            ar,
-            buf: Vec::new(),
-            current_segment: None,
-        }
-    }
-
-    async fn add_block(&mut self, key: &Key, block: Bytes) -> anyhow::Result<()> {
-        let (kind, segno, _) = key_to_slru_block(*key)?;
-
-        match kind {
-            SlruKind::Clog => {
-                ensure!(block.len() == BLCKSZ as usize || block.len() == BLCKSZ as usize + 8);
-            }
-            SlruKind::MultiXactMembers | SlruKind::MultiXactOffsets => {
-                ensure!(block.len() == BLCKSZ as usize);
-            }
-        }
-
-        let segment = (kind, segno);
-        match self.current_segment {
-            None => {
-                self.current_segment = Some(segment);
-                self.buf
-                    .extend_from_slice(block.slice(..BLCKSZ as usize).as_ref());
-            }
-            Some(current_seg) if current_seg == segment => {
-                self.buf
-                    .extend_from_slice(block.slice(..BLCKSZ as usize).as_ref());
-            }
-            Some(_) => {
-                self.flush().await?;
-
-                self.current_segment = Some(segment);
-                self.buf
-                    .extend_from_slice(block.slice(..BLCKSZ as usize).as_ref());
-            }
-        }
-
-        Ok(())
-    }
-
-    async fn flush(&mut self) -> anyhow::Result<()> {
-        let nblocks = self.buf.len() / BLCKSZ as usize;
-        let (kind, segno) = self.current_segment.take().unwrap();
-        let segname = format!("{}/{:>04X}", kind.to_str(), segno);
-        let header = new_tar_header(&segname, self.buf.len() as u64)?;
-        self.ar.append(&header, self.buf.as_slice()).await?;
-
-        trace!("Added to basebackup slru {} relsize {}", segname, nblocks);
-
-        self.buf.clear();
-
-        Ok(())
-    }
-
-    async fn finish(mut self) -> anyhow::Result<()> {
-        if self.current_segment.is_none() || self.buf.is_empty() {
-            return Ok(());
-        }
-
-        self.flush().await
-    }
-}
-
 impl<'a, W> Basebackup<'a, W>
 where
     W: AsyncWrite + Send + Sync + Unpin,
@@ -222,8 +140,6 @@ where
     async fn send_tarball(mut self) -> anyhow::Result<()> {
         // TODO include checksum
 
-        let lazy_slru_download = self.timeline.get_lazy_slru_download() && !self.full_backup;
-
         // Create pgdata subdirs structure
         for dir in PGDATA_SUBDIRS.iter() {
             let header = new_tar_header_dir(dir)?;
@@ -250,27 +166,20 @@ where
                     .context("could not add config file to basebackup tarball")?;
             }
         }
-        if !lazy_slru_download {
-            // Gather non-relational files from object storage pages.
-            let slru_partitions = self
+
+        // Gather non-relational files from object storage pages.
+        for kind in [
+            SlruKind::Clog,
+            SlruKind::MultiXactOffsets,
+            SlruKind::MultiXactMembers,
+        ] {
+            for segno in self
                 .timeline
-                .get_slru_keyspace(Version::Lsn(self.lsn), self.ctx)
+                .list_slru_segments(kind, Version::Lsn(self.lsn), self.ctx)
                 .await?
-                .partition(Timeline::MAX_GET_VECTORED_KEYS * BLCKSZ as u64);
-
-            let mut slru_builder = SlruSegmentsBuilder::new(&mut self.ar);
-
-            for part in slru_partitions.parts {
-                let blocks = self
-                    .timeline
-                    .get_vectored(&part.ranges, self.lsn, self.ctx)
-                    .await?;
-
-                for (key, block) in blocks {
-                    slru_builder.add_block(&key, block?).await?;
-                }
+            {
+                self.add_slru_segment(kind, segno).await?;
             }
-            slru_builder.finish().await?;
         }
 
         let mut min_restart_lsn: Lsn = Lsn::MAX;
@@ -396,6 +305,39 @@ where
         Ok(())
     }
 
+    //
+    // Generate SLRU segment files from repository.
+    //
+    async fn add_slru_segment(&mut self, slru: SlruKind, segno: u32) -> anyhow::Result<()> {
+        let nblocks = self
+            .timeline
+            .get_slru_segment_size(slru, segno, Version::Lsn(self.lsn), self.ctx)
+            .await?;
+
+        let mut slru_buf: Vec<u8> = Vec::with_capacity(nblocks as usize * BLCKSZ as usize);
+        for blknum in 0..nblocks {
+            let img = self
+                .timeline
+                .get_slru_page_at_lsn(slru, segno, blknum, self.lsn, self.ctx)
+                .await?;
+
+            if slru == SlruKind::Clog {
+                ensure!(img.len() == BLCKSZ as usize || img.len() == BLCKSZ as usize + 8);
+            } else {
+                ensure!(img.len() == BLCKSZ as usize);
+            }
+
+            slru_buf.extend_from_slice(&img[..BLCKSZ as usize]);
+        }
+
+        let segname = format!("{}/{:>04X}", slru.to_str(), segno);
+        let header = new_tar_header(&segname, slru_buf.len() as u64)?;
+        self.ar.append(&header, slru_buf.as_slice()).await?;
+
+        trace!("Added to basebackup slru {} relsize {}", segname, nblocks);
+        Ok(())
+    }
+
     //
     // Include database/tablespace directories.
     //

pageserver/src/bin/pageserver.rs

@@ -33,10 +33,12 @@ use pageserver::{
 use postgres_backend::AuthType;
 use utils::failpoint_support;
 use utils::logging::TracingErrorLayerEnablement;
+use utils::signals::ShutdownSignals;
 use utils::{
     auth::{JwtAuth, SwappableJwtAuth},
     logging, project_build_tag, project_git_version,
     sentry_init::init_sentry,
+    signals::Signal,
     tcp_listener,
 };
 
@@ -128,7 +130,7 @@ fn main() -> anyhow::Result<()> {
     let scenario = failpoint_support::init();
 
     // Basic initialization of things that don't change after startup
-    virtual_file::init(conf.max_file_descriptors, conf.virtual_file_io_engine);
+    virtual_file::init(conf.max_file_descriptors);
     page_cache::init(conf.page_cache_size);
 
     start_pageserver(launch_ts, conf).context("Failed to start pageserver")?;
@@ -654,42 +656,34 @@ fn start_pageserver(
     let mut shutdown_pageserver = Some(shutdown_pageserver.drop_guard());
 
     // All started up! Now just sit and wait for shutdown signal.
-    {
-        use signal_hook::consts::*;
-        let signal_handler = BACKGROUND_RUNTIME.spawn_blocking(move || {
-            let mut signals =
-                signal_hook::iterator::Signals::new([SIGINT, SIGTERM, SIGQUIT]).unwrap();
-            return signals
-                .forever()
-                .next()
-                .expect("forever() never returns None unless explicitly closed");
-        });
-        let signal = BACKGROUND_RUNTIME
-            .block_on(signal_handler)
-            .expect("join error");
-        match signal {
-            SIGQUIT => {
-                info!("Got signal {signal}. Terminating in immediate shutdown mode",);
-                std::process::exit(111);
-            }
-            SIGINT | SIGTERM => {
-                info!("Got signal {signal}. Terminating gracefully in fast shutdown mode",);
-
-                // This cancels the `shutdown_pageserver` cancellation tree.
-                // Right now that tree doesn't reach very far, and `task_mgr` is used instead.
-                // The plan is to change that over time.
-                shutdown_pageserver.take();
-                let bg_remote_storage = remote_storage.clone();
-                let bg_deletion_queue = deletion_queue.clone();
-                BACKGROUND_RUNTIME.block_on(pageserver::shutdown_pageserver(
-                    bg_remote_storage.map(|_| bg_deletion_queue),
-                    0,
-                ));
-                unreachable!()
-            }
-            _ => unreachable!(),
+    ShutdownSignals::handle(|signal| match signal {
+        Signal::Quit => {
+            info!(
+                "Got {}. Terminating in immediate shutdown mode",
+                signal.name()
+            );
+            std::process::exit(111);
         }
-    }
+
+        Signal::Interrupt | Signal::Terminate => {
+            info!(
+                "Got {}. Terminating gracefully in fast shutdown mode",
+                signal.name()
+            );
+
+            // This cancels the `shutdown_pageserver` cancellation tree.
+            // Right now that tree doesn't reach very far, and `task_mgr` is used instead.
+            // The plan is to change that over time.
+            shutdown_pageserver.take();
+            let bg_remote_storage = remote_storage.clone();
+            let bg_deletion_queue = deletion_queue.clone();
+            BACKGROUND_RUNTIME.block_on(pageserver::shutdown_pageserver(
+                bg_remote_storage.map(|_| bg_deletion_queue),
+                0,
+            ));
+            unreachable!()
+        }
+    })
 }
 
 fn create_remote_storage_client(

pageserver/src/config.rs

@@ -36,7 +36,6 @@ use crate::tenant::config::TenantConfOpt;
 use crate::tenant::{
     TENANTS_SEGMENT_NAME, TENANT_DELETED_MARKER_FILE_NAME, TIMELINES_SEGMENT_NAME,
 };
-use crate::virtual_file;
 use crate::{
     IGNORED_TENANT_FILE_NAME, METADATA_FILE_NAME, TENANT_CONFIG_NAME, TENANT_HEATMAP_BASENAME,
     TENANT_LOCATION_CONFIG_NAME, TIMELINE_DELETE_MARK_SUFFIX, TIMELINE_UNINIT_MARK_SUFFIX,
@@ -44,8 +43,6 @@ use crate::{
 
 use self::defaults::DEFAULT_CONCURRENT_TENANT_WARMUP;
 
-use self::defaults::DEFAULT_VIRTUAL_FILE_IO_ENGINE;
-
 pub mod defaults {
     use crate::tenant::config::defaults::*;
     use const_format::formatcp;
@@ -82,8 +79,6 @@ pub mod defaults {
 
     pub const DEFAULT_INGEST_BATCH_SIZE: u64 = 100;
 
-    pub const DEFAULT_VIRTUAL_FILE_IO_ENGINE: &str = "std-fs";
-
     ///
     /// Default built-in configuration file.
     ///
@@ -119,8 +114,6 @@ pub mod defaults {
 
 #ingest_batch_size = {DEFAULT_INGEST_BATCH_SIZE}
 
-#virtual_file_io_engine = '{DEFAULT_VIRTUAL_FILE_IO_ENGINE}'
-
 [tenant_config]
 #checkpoint_distance = {DEFAULT_CHECKPOINT_DISTANCE} # in bytes
 #checkpoint_timeout = {DEFAULT_CHECKPOINT_TIMEOUT}
@@ -254,8 +247,6 @@ pub struct PageServerConf {
 
     /// Maximum number of WAL records to be ingested and committed at the same time
     pub ingest_batch_size: u64,
-
-    pub virtual_file_io_engine: virtual_file::IoEngineKind,
 }
 
 /// We do not want to store this in a PageServerConf because the latter may be logged
@@ -340,8 +331,6 @@ struct PageServerConfigBuilder {
     secondary_download_concurrency: BuilderValue<usize>,
 
     ingest_batch_size: BuilderValue<u64>,
-
-    virtual_file_io_engine: BuilderValue<virtual_file::IoEngineKind>,
 }
 
 impl Default for PageServerConfigBuilder {
@@ -417,8 +406,6 @@ impl Default for PageServerConfigBuilder {
             secondary_download_concurrency: Set(DEFAULT_SECONDARY_DOWNLOAD_CONCURRENCY),
 
             ingest_batch_size: Set(DEFAULT_INGEST_BATCH_SIZE),
-
-            virtual_file_io_engine: Set(DEFAULT_VIRTUAL_FILE_IO_ENGINE.parse().unwrap()),
         }
     }
 }
@@ -575,10 +562,6 @@ impl PageServerConfigBuilder {
         self.ingest_batch_size = BuilderValue::Set(ingest_batch_size)
     }
 
-    pub fn virtual_file_io_engine(&mut self, value: virtual_file::IoEngineKind) {
-        self.virtual_file_io_engine = BuilderValue::Set(value);
-    }
-
     pub fn build(self) -> anyhow::Result<PageServerConf> {
         let concurrent_tenant_warmup = self
             .concurrent_tenant_warmup
@@ -686,9 +669,6 @@ impl PageServerConfigBuilder {
             ingest_batch_size: self
                 .ingest_batch_size
                 .ok_or(anyhow!("missing ingest_batch_size"))?,
-            virtual_file_io_engine: self
-                .virtual_file_io_engine
-                .ok_or(anyhow!("missing virtual_file_io_engine"))?,
         })
     }
 }
@@ -940,9 +920,6 @@ impl PageServerConf {
                     builder.secondary_download_concurrency(parse_toml_u64(key, item)? as usize)
                 },
                 "ingest_batch_size" => builder.ingest_batch_size(parse_toml_u64(key, item)?),
-                "virtual_file_io_engine" => {
-                    builder.virtual_file_io_engine(parse_toml_from_str("virtual_file_io_engine", item)?)
-                }
                 _ => bail!("unrecognized pageserver option '{key}'"),
             }
         }
@@ -1016,7 +993,6 @@ impl PageServerConf {
             heatmap_upload_concurrency: defaults::DEFAULT_HEATMAP_UPLOAD_CONCURRENCY,
             secondary_download_concurrency: defaults::DEFAULT_SECONDARY_DOWNLOAD_CONCURRENCY,
             ingest_batch_size: defaults::DEFAULT_INGEST_BATCH_SIZE,
-            virtual_file_io_engine: DEFAULT_VIRTUAL_FILE_IO_ENGINE.parse().unwrap(),
         }
     }
 }
@@ -1249,7 +1225,6 @@ background_task_maximum_delay = '334 s'
                 heatmap_upload_concurrency: defaults::DEFAULT_HEATMAP_UPLOAD_CONCURRENCY,
                 secondary_download_concurrency: defaults::DEFAULT_SECONDARY_DOWNLOAD_CONCURRENCY,
                 ingest_batch_size: defaults::DEFAULT_INGEST_BATCH_SIZE,
-                virtual_file_io_engine: DEFAULT_VIRTUAL_FILE_IO_ENGINE.parse().unwrap(),
             },
             "Correct defaults should be used when no config values are provided"
         );
@@ -1313,7 +1288,6 @@ background_task_maximum_delay = '334 s'
                 heatmap_upload_concurrency: defaults::DEFAULT_HEATMAP_UPLOAD_CONCURRENCY,
                 secondary_download_concurrency: defaults::DEFAULT_SECONDARY_DOWNLOAD_CONCURRENCY,
                 ingest_batch_size: 100,
-                virtual_file_io_engine: DEFAULT_VIRTUAL_FILE_IO_ENGINE.parse().unwrap(),
             },
             "Should be able to parse all basic config values correctly"
         );

pageserver/src/disk_usage_eviction_task.rs

@@ -97,86 +97,23 @@ pub enum EvictionOrder {
 
     /// Order the layers to be evicted by how recently they have been accessed relatively within
     /// the set of resident layers of a tenant.
+    ///
+    /// This strategy will evict layers more fairly but is untested.
     RelativeAccessed {
-        /// Determines if the tenant with most layers should lose first.
-        ///
-        /// Having this enabled is currently the only reasonable option, because the order in which
-        /// we read tenants is deterministic. If we find the need to use this as `false`, we need
-        /// to ensure nondeterminism by adding in a random number to break the
-        /// `relative_last_activity==0.0` ties.
-        #[serde(default = "default_highest_layer_count_loses_first")]
+        #[serde(default)]
         highest_layer_count_loses_first: bool,
     },
 }
 
-fn default_highest_layer_count_loses_first() -> bool {
-    true
-}
-
 impl EvictionOrder {
-    fn sort(&self, candidates: &mut [(MinResidentSizePartition, EvictionCandidate)]) {
-        use EvictionOrder::*;
-
+    /// Return true, if with [`Self::RelativeAccessed`] order the tenants with the highest layer
+    /// counts should be the first ones to have their layers evicted.
+    fn highest_layer_count_loses_first(&self) -> bool {
         match self {
-            AbsoluteAccessed => {
-                candidates.sort_unstable_by_key(|(partition, candidate)| {
-                    (*partition, candidate.last_activity_ts)
-                });
-            }
-            RelativeAccessed { .. } => candidates.sort_unstable_by_key(|(partition, candidate)| {
-                (*partition, candidate.relative_last_activity)
-            }),
-        }
-    }
-
-    /// Called to fill in the [`EvictionCandidate::relative_last_activity`] while iterating tenants
-    /// layers in **most** recently used order.
-    fn relative_last_activity(&self, total: usize, index: usize) -> finite_f32::FiniteF32 {
-        use EvictionOrder::*;
-
-        match self {
-            AbsoluteAccessed => finite_f32::FiniteF32::ZERO,
-            RelativeAccessed {
+            EvictionOrder::AbsoluteAccessed => false,
+            EvictionOrder::RelativeAccessed {
                 highest_layer_count_loses_first,
-            } => {
-                // keeping the -1 or not decides if every tenant should lose their least recently accessed
-                // layer OR if this should happen in the order of having highest layer count:
-                let fudge = if *highest_layer_count_loses_first {
-                    // relative_last_activity vs. tenant layer count:
-                    // - 0.1..=1.0 (10 layers)
-                    // - 0.01..=1.0 (100 layers)
-                    // - 0.001..=1.0 (1000 layers)
-                    //
-                    // leading to evicting less of the smallest tenants.
-                    0
-                } else {
-                    // use full 0.0..=1.0 range, which means even the smallest tenants could always lose a
-                    // layer. the actual ordering is unspecified: for 10k tenants on a pageserver it could
-                    // be that less than 10k layer evictions is enough, so we would not need to evict from
-                    // all tenants.
-                    //
-                    // as the tenant ordering is now deterministic this could hit the same tenants
-                    // disproportionetly on multiple invocations. alternative could be to remember how many
-                    // layers did we evict last time from this tenant, and inject that as an additional
-                    // fudge here.
-                    1
-                };
-
-                let total = total.checked_sub(fudge).filter(|&x| x > 1).unwrap_or(1);
-                let divider = total as f32;
-
-                // most recently used is always (total - 0) / divider == 1.0
-                // least recently used depends on the fudge:
-                // -       (total - 1) - (total - 1) / total => 0 / total
-                // -             total - (total - 1) / total => 1 / total
-                let distance = (total - index) as f32;
-
-                finite_f32::FiniteF32::try_from_normalized(distance / divider)
-                    .unwrap_or_else(|val| {
-                        tracing::warn!(%fudge, "calculated invalid relative_last_activity for i={index}, total={total}: {val}");
-                        finite_f32::FiniteF32::ZERO
-                    })
-            }
+            } => *highest_layer_count_loses_first,
         }
     }
 }
@@ -452,6 +389,52 @@ pub(crate) async fn disk_usage_eviction_task_iteration_impl<U: Usage>(
 
     let selection = select_victims(&candidates, usage_pre);
 
+    let mut candidates = candidates;
+
+    let selection = if matches!(eviction_order, EvictionOrder::RelativeAccessed { .. }) {
+        // we currently have the layers ordered by AbsoluteAccessed so that we can get the summary
+        // for comparison here. this is a temporary measure to develop alternatives.
+        use std::fmt::Write;
+
+        let mut summary_buf = String::with_capacity(256);
+
+        {
+            let absolute_summary = candidates
+                .iter()
+                .take(selection.amount)
+                .map(|(_, candidate)| candidate)
+                .collect::<summary::EvictionSummary>();
+
+            write!(summary_buf, "{absolute_summary}").expect("string grows");
+
+            info!("absolute accessed selection summary: {summary_buf}");
+        }
+
+        candidates.sort_unstable_by_key(|(partition, candidate)| {
+            (*partition, candidate.relative_last_activity)
+        });
+
+        let selection = select_victims(&candidates, usage_pre);
+
+        {
+            summary_buf.clear();
+
+            let relative_summary = candidates
+                .iter()
+                .take(selection.amount)
+                .map(|(_, candidate)| candidate)
+                .collect::<summary::EvictionSummary>();
+
+            write!(summary_buf, "{relative_summary}").expect("string grows");
+
+            info!("relative accessed selection summary: {summary_buf}");
+        }
+
+        selection
+    } else {
+        selection
+    };
+
     let (evicted_amount, usage_planned) = selection.into_amount_and_planned();
 
     // phase2: evict layers
@@ -852,12 +835,54 @@ async fn collect_eviction_candidates(
             .sort_unstable_by_key(|layer_info| std::cmp::Reverse(layer_info.last_activity_ts));
         let mut cumsum: i128 = 0;
 
-        let total = tenant_candidates.len();
+        // keeping the -1 or not decides if every tenant should lose their least recently accessed
+        // layer OR if this should happen in the order of having highest layer count:
+        let fudge = if eviction_order.highest_layer_count_loses_first() {
+            // relative_age vs. tenant layer count:
+            // - 0.1..=1.0 (10 layers)
+            // - 0.01..=1.0 (100 layers)
+            // - 0.001..=1.0 (1000 layers)
+            //
+            // leading to evicting less of the smallest tenants.
+            0
+        } else {
+            // use full 0.0..=1.0 range, which means even the smallest tenants could always lose a
+            // layer. the actual ordering is unspecified: for 10k tenants on a pageserver it could
+            // be that less than 10k layer evictions is enough, so we would not need to evict from
+            // all tenants.
+            //
+            // as the tenant ordering is now deterministic this could hit the same tenants
+            // disproportionetly on multiple invocations. alternative could be to remember how many
+            // layers did we evict last time from this tenant, and inject that as an additional
+            // fudge here.
+            1
+        };
+
+        let total = tenant_candidates
+            .len()
+            .checked_sub(fudge)
+            .filter(|&x| x > 0)
+            // support 0 or 1 resident layer tenants as well
+            .unwrap_or(1);
+        let divider = total as f32;
 
         for (i, mut candidate) in tenant_candidates.into_iter().enumerate() {
             // as we iterate this reverse sorted list, the most recently accessed layer will always
             // be 1.0; this is for us to evict it last.
-            candidate.relative_last_activity = eviction_order.relative_last_activity(total, i);
+            candidate.relative_last_activity = if matches!(
+                eviction_order,
+                EvictionOrder::RelativeAccessed { .. }
+            ) {
+                // another possibility: use buckets, like (256.0 * relative_last_activity) as u8 or
+                // similarly for u16. unsure how it would help.
+                finite_f32::FiniteF32::try_from_normalized((total - i) as f32 / divider)
+                    .unwrap_or_else(|val| {
+                        tracing::warn!(%fudge, "calculated invalid relative_last_activity for i={i}, total={total}: {val}");
+                        finite_f32::FiniteF32::ZERO
+                    })
+            } else {
+                finite_f32::FiniteF32::ZERO
+            };
 
             let partition = if cumsum > min_resident_size as i128 {
                 MinResidentSizePartition::Above
@@ -902,7 +927,10 @@ async fn collect_eviction_candidates(
     debug_assert!(MinResidentSizePartition::Above < MinResidentSizePartition::Below,
         "as explained in the function's doc comment, layers that aren't in the tenant's min_resident_size are evicted first");
 
-    eviction_order.sort(&mut candidates);
+    // always behave as if AbsoluteAccessed was selected. if RelativeAccessed is in use, we
+    // will sort later by candidate.relative_last_activity to get compare evictions.
+    candidates
+        .sort_unstable_by_key(|(partition, candidate)| (*partition, candidate.last_activity_ts));
 
     Ok(EvictionCandidates::Finished(candidates))
 }
@@ -1042,12 +1070,6 @@ pub(crate) mod finite_f32 {
         }
     }
 
-    impl From<FiniteF32> for f32 {
-        fn from(value: FiniteF32) -> f32 {
-            value.0
-        }
-    }
-
     impl FiniteF32 {
         pub const ZERO: FiniteF32 = FiniteF32(0.0);
 
@@ -1060,9 +1082,136 @@ pub(crate) mod finite_f32 {
                 Err(value)
             }
         }
+    }
+}
 
-        pub fn into_inner(self) -> f32 {
-            self.into()
+mod summary {
+    use super::finite_f32::FiniteF32;
+    use super::{EvictionCandidate, LayerCount};
+    use pageserver_api::shard::TenantShardId;
+    use std::collections::{BTreeMap, HashMap};
+    use std::time::SystemTime;
+
+    #[derive(Debug, Default)]
+    pub(super) struct EvictionSummary {
+        evicted_per_tenant: HashMap<TenantShardId, LayerCount>,
+        total: LayerCount,
+
+        last_absolute: Option<SystemTime>,
+        last_relative: Option<FiniteF32>,
+    }
+
+    impl<'a> FromIterator<&'a EvictionCandidate> for EvictionSummary {
+        fn from_iter<T: IntoIterator<Item = &'a EvictionCandidate>>(iter: T) -> Self {
+            let mut summary = EvictionSummary::default();
+            for item in iter {
+                let counts = summary
+                    .evicted_per_tenant
+                    .entry(*item.layer.get_tenant_shard_id())
+                    .or_default();
+
+                let sz = item.layer.get_file_size();
+
+                counts.file_sizes += sz;
+                counts.count += 1;
+
+                summary.total.file_sizes += sz;
+                summary.total.count += 1;
+
+                summary.last_absolute = Some(item.last_activity_ts);
+                summary.last_relative = Some(item.relative_last_activity);
+            }
+
+            summary
+        }
+    }
+
+    struct SiBytesAmount(u64);
+
+    impl std::fmt::Display for SiBytesAmount {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            if self.0 < 1024 {
+                return write!(f, "{}B", self.0);
+            }
+
+            let mut tmp = self.0;
+            let mut ch = 0;
+            let suffixes = b"KMGTPE";
+
+            while tmp > 1024 * 1024 && ch < suffixes.len() - 1 {
+                tmp /= 1024;
+                ch += 1;
+            }
+
+            let ch = suffixes[ch] as char;
+
+            write!(f, "{:.1}{ch}iB", tmp as f64 / 1024.0)
+        }
+    }
+
+    impl std::fmt::Display for EvictionSummary {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            // wasteful, but it's for testing
+
+            let mut sorted: BTreeMap<usize, Vec<(TenantShardId, u64)>> = BTreeMap::new();
+
+            for (tenant_shard_id, count) in &self.evicted_per_tenant {
+                sorted
+                    .entry(count.count)
+                    .or_default()
+                    .push((*tenant_shard_id, count.file_sizes));
+            }
+
+            let total_file_sizes = SiBytesAmount(self.total.file_sizes);
+
+            writeln!(
+                f,
+                "selected {} layers of {total_file_sizes} up to ({:?}, {:.2?}):",
+                self.total.count, self.last_absolute, self.last_relative,
+            )?;
+
+            for (count, per_tenant) in sorted.iter().rev().take(10) {
+                write!(f, "- {count} layers: ")?;
+
+                if per_tenant.len() < 3 {
+                    for (i, (tenant_shard_id, bytes)) in per_tenant.iter().enumerate() {
+                        if i > 0 {
+                            write!(f, ", ")?;
+                        }
+                        let bytes = SiBytesAmount(*bytes);
+                        write!(f, "{tenant_shard_id} ({bytes})")?;
+                    }
+                } else {
+                    let num_tenants = per_tenant.len();
+                    let total_bytes = per_tenant.iter().map(|(_id, bytes)| bytes).sum::<u64>();
+                    let total_bytes = SiBytesAmount(total_bytes);
+                    let layers = num_tenants * count;
+
+                    write!(
+                        f,
+                        "{num_tenants} tenants {total_bytes} in total {layers} layers",
+                    )?;
+                }
+
+                writeln!(f)?;
+            }
+
+            if sorted.len() > 10 {
+                let (rem_count, rem_bytes) = sorted
+                    .iter()
+                    .rev()
+                    .map(|(count, per_tenant)| {
+                        (
+                            count,
+                            per_tenant.iter().map(|(_id, bytes)| bytes).sum::<u64>(),
+                        )
+                    })
+                    .fold((0, 0), |acc, next| (acc.0 + next.0, acc.1 + next.1));
+                let rem_bytes = SiBytesAmount(rem_bytes);
+                writeln!(f, "- rest of tenants ({}) not shown ({rem_count} layers or {:.1}%, {rem_bytes} or {:.1}% bytes)", sorted.len() - 10, 100.0 * rem_count as f64 / self.total.count as f64, 100.0 * rem_bytes.0 as f64 / self.total.file_sizes as f64)?;
+            }
+
+            Ok(())
         }
     }
 }
@@ -1187,40 +1336,3 @@ mod filesystem_level_usage {
         assert!(!usage.has_pressure());
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn relative_equal_bounds() {
-        let order = EvictionOrder::RelativeAccessed {
-            highest_layer_count_loses_first: false,
-        };
-
-        let len = 10;
-        let v = (0..len)
-            .map(|i| order.relative_last_activity(len, i).into_inner())
-            .collect::<Vec<_>>();
-
-        assert_eq!(v.first(), Some(&1.0));
-        assert_eq!(v.last(), Some(&0.0));
-        assert!(v.windows(2).all(|slice| slice[0] > slice[1]));
-    }
-
-    #[test]
-    fn relative_spare_bounds() {
-        let order = EvictionOrder::RelativeAccessed {
-            highest_layer_count_loses_first: true,
-        };
-
-        let len = 10;
-        let v = (0..len)
-            .map(|i| order.relative_last_activity(len, i).into_inner())
-            .collect::<Vec<_>>();
-
-        assert_eq!(v.first(), Some(&1.0));
-        assert_eq!(v.last(), Some(&0.1));
-        assert!(v.windows(2).all(|slice| slice[0] > slice[1]));
-    }
-}

pageserver/src/http/openapi_spec.yml

@@ -419,6 +419,12 @@ paths:
             type: string
             format: date-time
           description: A timestamp to get the LSN
+        - name: version
+          in: query
+          required: false
+          schema:
+            type: integer
+          description: The version of the endpoint to use
       responses:
         "200":
           description: OK
@@ -668,10 +674,6 @@ paths:
       responses:
         "200":
           description: Tenant is now in requested state
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/TenantLocationConfigResponse"
         "503":
           description: Tenant's state cannot be changed right now.  Wait a few seconds and retry.
           content:
@@ -875,56 +877,6 @@ paths:
               schema:
                 $ref: "#/components/schemas/ServiceUnavailableError"
 
-  /v1/tenant/{tenant_id}/{timeline_id}/preserve_initdb_archive:
-    parameters:
-      - name: tenant_id
-        in: path
-        required: true
-        schema:
-          type: string
-      - name: timeline_id
-        in: path
-        required: true
-        schema:
-          type: string
-    post:
-      description: |
-        Marks the initdb archive for preservation upon deletion of the timeline or tenant.
-        This is meant to be part of the disaster recovery process.
-      responses:
-        "202":
-          description: Tenant scheduled to load successfully
-        "404":
-          description: No tenant or timeline found for the specified ids
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/Error"
-        "401":
-          description: Unauthorized Error
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/UnauthorizedError"
-        "403":
-          description: Forbidden Error
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/ForbiddenError"
-        "500":
-          description: Generic operation error
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/Error"
-        "503":
-          description: Temporarily unavailable, please retry.
-          content:
-            application/json:
-              schema:
-                $ref: "#/components/schemas/ServiceUnavailableError"
-
 
   /v1/tenant/{tenant_id}/synthetic_size:
     parameters:
@@ -1424,27 +1376,6 @@ components:
           $ref: '#/components/schemas/SecondaryConfig'
         tenant_conf:
           $ref: '#/components/schemas/TenantConfig'
-    TenantLocationConfigResponse:
-      type: object
-      required:
-        - shards
-      properties:
-        shards:
-          description: Pageservers where this tenant's shards are attached.  Not populated for secondary locations.
-          type: array
-          items:
-            $ref: "#/components/schemas/TenantShardLocation"
-    TenantShardLocation:
-      type: object
-      required:
-        - node_id
-        - shard_id
-      properties:
-        node_id:
-          description: Pageserver node ID where this shard is attached
-          type: integer
-        shard_id: Tenant shard ID of the shard
-          type: string
     SecondaryConfig:
       type: object
       properties:

pageserver/src/http/routes.rs

@@ -17,8 +17,6 @@ use metrics::launch_timestamp::LaunchTimestamp;
 use pageserver_api::models::LocationConfigListResponse;
 use pageserver_api::models::ShardParameters;
 use pageserver_api::models::TenantDetails;
-use pageserver_api::models::TenantLocationConfigResponse;
-use pageserver_api::models::TenantShardLocation;
 use pageserver_api::models::TenantState;
 use pageserver_api::models::{
     DownloadRemoteLayersTaskSpawnRequest, LocationConfigMode, TenantAttachRequest,
@@ -189,7 +187,6 @@ impl From<TenantSlotUpsertError> for ApiError {
         match e {
             InternalError(e) => ApiError::InternalServerError(anyhow::anyhow!("{e}")),
             MapState(e) => e.into(),
-            ShuttingDown(_) => ApiError::ShuttingDown,
         }
     }
 }
@@ -498,10 +495,6 @@ async fn timeline_create_handler(
                     .map_err(ApiError::InternalServerError)?;
                 json_response(StatusCode::CREATED, timeline_info)
             }
-            Err(_) if tenant.cancel.is_cancelled() => {
-                // In case we get some ugly error type during shutdown, cast it into a clean 503.
-                json_response(StatusCode::SERVICE_UNAVAILABLE, HttpErrorBody::from_msg("Tenant shutting down".to_string()))
-            }
             Err(tenant::CreateTimelineError::Conflict | tenant::CreateTimelineError::AlreadyCreating) => {
                 json_response(StatusCode::CONFLICT, ())
             }
@@ -568,43 +561,6 @@ async fn timeline_list_handler(
     json_response(StatusCode::OK, response_data)
 }
 
-async fn timeline_preserve_initdb_handler(
-    request: Request<Body>,
-    _cancel: CancellationToken,
-) -> Result<Response<Body>, ApiError> {
-    let tenant_shard_id: TenantShardId = parse_request_param(&request, "tenant_shard_id")?;
-    let timeline_id: TimelineId = parse_request_param(&request, "timeline_id")?;
-    check_permission(&request, Some(tenant_shard_id.tenant_id))?;
-
-    // Part of the process for disaster recovery from safekeeper-stored WAL:
-    // If we don't recover into a new timeline but want to keep the timeline ID,
-    // then the initdb archive is deleted. This endpoint copies it to a different
-    // location where timeline recreation cand find it.
-
-    async {
-        let tenant = mgr::get_tenant(tenant_shard_id, true)?;
-
-        let timeline = tenant
-            .get_timeline(timeline_id, false)
-            .map_err(|e| ApiError::NotFound(e.into()))?;
-
-        timeline
-            .preserve_initdb_archive()
-            .await
-            .context("preserving initdb archive")
-            .map_err(ApiError::InternalServerError)?;
-
-        Ok::<_, ApiError>(())
-    }
-    .instrument(info_span!("timeline_preserve_initdb_archive",
-                tenant_id = %tenant_shard_id.tenant_id,
-                shard_id = %tenant_shard_id.shard_slug(),
-                %timeline_id))
-    .await?;
-
-    json_response(StatusCode::OK, ())
-}
-
 async fn timeline_detail_handler(
     request: Request<Body>,
     _cancel: CancellationToken,
@@ -959,7 +915,6 @@ async fn tenant_status(
                 attachment_status: state.attachment_status(),
                 generation: tenant.generation().into(),
             },
-            walredo: tenant.wal_redo_manager_status(),
             timelines: tenant.list_timeline_ids(),
         })
     }
@@ -1265,9 +1220,19 @@ async fn tenant_create_handler(
     };
     // We created the tenant. Existing API semantics are that the tenant
     // is Active when this function returns.
-    new_tenant
+    if let res @ Err(_) = new_tenant
         .wait_to_become_active(ACTIVE_TENANT_TIMEOUT)
-        .await?;
+        .await
+    {
+        // This shouldn't happen because we just created the tenant directory
+        // in upsert_location, and there aren't any remote timelines
+        // to load, so, nothing can really fail during load.
+        // Don't do cleanup because we don't know how we got here.
+        // The tenant will likely be in `Broken` state and subsequent
+        // calls will fail.
+        res.context("created tenant failed to become active")
+            .map_err(ApiError::InternalServerError)?;
+    }
 
     json_response(
         StatusCode::CREATED,
@@ -1359,7 +1324,7 @@ async fn put_tenant_location_config_handler(
     let location_conf =
         LocationConf::try_from(&request_data.config).map_err(ApiError::BadRequest)?;
 
-    let attached = state
+    state
         .tenant_manager
         .upsert_location(
             tenant_shard_id,
@@ -1368,8 +1333,7 @@ async fn put_tenant_location_config_handler(
             tenant::SpawnMode::Normal,
             &ctx,
         )
-        .await?
-        .is_some();
+        .await?;
 
     if let Some(_flush_ms) = flush {
         match state
@@ -1388,18 +1352,7 @@ async fn put_tenant_location_config_handler(
         tracing::info!("No flush requested when configuring");
     }
 
-    // This API returns a vector of pageservers where the tenant is attached: this is
-    // primarily for use in the sharding service.  For compatibilty, we also return this
-    // when called directly on a pageserver, but the payload is always zero or one shards.
-    let mut response = TenantLocationConfigResponse { shards: Vec::new() };
-    if attached {
-        response.shards.push(TenantShardLocation {
-            shard_id: tenant_shard_id,
-            node_id: state.conf.id,
-        })
-    }
-
-    json_response(StatusCode::OK, response)
+    json_response(StatusCode::OK, ())
 }
 
 async fn list_location_config_handler(
@@ -1990,10 +1943,6 @@ pub fn make_router(
         .post("/v1/tenant/:tenant_id/ignore", |r| {
             api_handler(r, tenant_ignore_handler)
         })
-        .post(
-            "/v1/tenant/:tenant_shard_id/timeline/:timeline_id/preserve_initdb_archive",
-            |r| api_handler(r, timeline_preserve_initdb_handler),
-        )
         .get("/v1/tenant/:tenant_shard_id/timeline/:timeline_id", |r| {
             api_handler(r, timeline_detail_handler)
         })

pageserver/src/lib.rs

@@ -1,4 +1,3 @@
-#![recursion_limit = "300"]
 #![deny(clippy::undocumented_unsafe_blocks)]
 
 mod auth;

pageserver/src/metrics.rs

@@ -150,43 +150,6 @@ pub(crate) static MATERIALIZED_PAGE_CACHE_HIT: Lazy<IntCounter> = Lazy::new(|| {
     .expect("failed to define a metric")
 });
 
-pub(crate) struct GetVectoredLatency {
-    map: EnumMap<TaskKind, Option<Histogram>>,
-}
-
-impl GetVectoredLatency {
-    // Only these task types perform vectored gets. Filter all other tasks out to reduce total
-    // cardinality of the metric.
-    const TRACKED_TASK_KINDS: [TaskKind; 2] = [TaskKind::Compaction, TaskKind::PageRequestHandler];
-
-    pub(crate) fn for_task_kind(&self, task_kind: TaskKind) -> Option<&Histogram> {
-        self.map[task_kind].as_ref()
-    }
-}
-
-pub(crate) static GET_VECTORED_LATENCY: Lazy<GetVectoredLatency> = Lazy::new(|| {
-    let inner = register_histogram_vec!(
-        "pageserver_get_vectored_seconds",
-        "Time spent in get_vectored",
-        &["task_kind"],
-        CRITICAL_OP_BUCKETS.into(),
-    )
-    .expect("failed to define a metric");
-
-    GetVectoredLatency {
-        map: EnumMap::from_array(std::array::from_fn(|task_kind_idx| {
-            let task_kind = <TaskKind as enum_map::Enum>::from_usize(task_kind_idx);
-
-            if GetVectoredLatency::TRACKED_TASK_KINDS.contains(&task_kind) {
-                let task_kind = task_kind.into();
-                Some(inner.with_label_values(&[task_kind]))
-            } else {
-                None
-            }
-        })),
-    }
-});
-
 pub(crate) struct PageCacheMetricsForTaskKind {
     pub read_accesses_materialized_page: IntCounter,
     pub read_accesses_immutable: IntCounter,
@@ -969,7 +932,6 @@ pub(crate) static STORAGE_IO_SIZE: Lazy<IntGaugeVec> = Lazy::new(|| {
     .expect("failed to define a metric")
 });
 
-#[cfg(not(test))]
 pub(crate) mod virtual_file_descriptor_cache {
     use super::*;
 
@@ -989,20 +951,6 @@ pub(crate) mod virtual_file_descriptor_cache {
     // ```
 }
 
-#[cfg(not(test))]
-pub(crate) mod virtual_file_io_engine {
-    use super::*;
-
-    pub(crate) static KIND: Lazy<UIntGaugeVec> = Lazy::new(|| {
-        register_uint_gauge_vec!(
-            "pageserver_virtual_file_io_engine_kind",
-            "The configured io engine for VirtualFile",
-            &["kind"],
-        )
-        .unwrap()
-    });
-}
-
 #[derive(Debug)]
 struct GlobalAndPerTimelineHistogram {
     global: Histogram,
@@ -1043,7 +991,6 @@ pub enum SmgrQueryType {
     GetRelSize,
     GetPageAtLsn,
     GetDbSize,
-    GetSlruSegment,
 }
 
 #[derive(Debug)]
@@ -1160,12 +1107,11 @@ mod smgr_query_time_tests {
     #[test]
     fn op_label_name() {
         use super::SmgrQueryType::*;
-        let expect: [(super::SmgrQueryType, &'static str); 5] = [
+        let expect: [(super::SmgrQueryType, &'static str); 4] = [
             (GetRelExists, "get_rel_exists"),
             (GetRelSize, "get_rel_size"),
             (GetPageAtLsn, "get_page_at_lsn"),
             (GetDbSize, "get_db_size"),
-            (GetSlruSegment, "get_slru_segment"),
         ];
         for (op, expect) in expect {
             let actual: &'static str = op.into();
@@ -1651,18 +1597,11 @@ pub(crate) static WAL_REDO_RECORD_COUNTER: Lazy<IntCounter> = Lazy::new(|| {
     .unwrap()
 });
 
-#[rustfmt::skip]
 pub(crate) static WAL_REDO_PROCESS_LAUNCH_DURATION_HISTOGRAM: Lazy<Histogram> = Lazy::new(|| {
     register_histogram!(
         "pageserver_wal_redo_process_launch_duration",
         "Histogram of the duration of successful WalRedoProcess::launch calls",
-        vec![
-            0.0002, 0.0004, 0.0006, 0.0008, 0.0010,
-            0.0020, 0.0040, 0.0060, 0.0080, 0.0100,
-            0.0200, 0.0400, 0.0600, 0.0800, 0.1000,
-            0.2000, 0.4000, 0.6000, 0.8000, 1.0000,
-            1.5000, 2.0000, 2.5000, 3.0000, 4.0000, 10.0000
-        ],
+        redo_histogram_time_buckets!(),
     )
     .expect("failed to define a metric")
 });

pageserver/src/page_service.rs

@@ -22,8 +22,7 @@ use pageserver_api::models::{
     PagestreamBeMessage, PagestreamDbSizeRequest, PagestreamDbSizeResponse,
     PagestreamErrorResponse, PagestreamExistsRequest, PagestreamExistsResponse,
     PagestreamFeMessage, PagestreamGetPageRequest, PagestreamGetPageResponse,
-    PagestreamGetSlruSegmentRequest, PagestreamGetSlruSegmentResponse, PagestreamNblocksRequest,
-    PagestreamNblocksResponse,
+    PagestreamNblocksRequest, PagestreamNblocksResponse,
 };
 use pageserver_api::shard::ShardIndex;
 use pageserver_api::shard::{ShardCount, ShardNumber};
@@ -62,7 +61,7 @@ use crate::context::{DownloadBehavior, RequestContext};
 use crate::import_datadir::import_wal_from_tar;
 use crate::metrics;
 use crate::metrics::LIVE_CONNECTIONS_COUNT;
-use crate::pgdatadir_mapping::Version;
+use crate::pgdatadir_mapping::{rel_block_to_key, Version};
 use crate::task_mgr;
 use crate::task_mgr::TaskKind;
 use crate::tenant::debug_assert_current_span_has_tenant_and_timeline_id;
@@ -75,8 +74,7 @@ use crate::tenant::GetTimelineError;
 use crate::tenant::PageReconstructError;
 use crate::tenant::Timeline;
 use crate::trace::Tracer;
-use pageserver_api::key::rel_block_to_key;
-use pageserver_api::reltag::SlruKind;
+
 use postgres_ffi::pg_constants::DEFAULTTABLESPACE_OID;
 use postgres_ffi::BLCKSZ;
 
@@ -323,8 +321,8 @@ enum PageStreamError {
     Shutdown,
 
     /// Something went wrong reading a page: this likely indicates a pageserver bug
-    #[error("Read error")]
-    Read(#[source] PageReconstructError),
+    #[error("Read error: {0}")]
+    Read(PageReconstructError),
 
     /// Ran out of time waiting for an LSN
     #[error("LSN timeout: {0}")]
@@ -333,11 +331,11 @@ enum PageStreamError {
     /// The entity required to serve the request (tenant or timeline) is not found,
     /// or is not found in a suitable state to serve a request.
     #[error("Not found: {0}")]
-    NotFound(Cow<'static, str>),
+    NotFound(std::borrow::Cow<'static, str>),
 
     /// Request asked for something that doesn't make sense, like an invalid LSN
     #[error("Bad request: {0}")]
-    BadRequest(Cow<'static, str>),
+    BadRequest(std::borrow::Cow<'static, str>),
 }
 
 impl From<PageReconstructError> for PageStreamError {
@@ -369,16 +367,6 @@ impl From<WaitLsnError> for PageStreamError {
     }
 }
 
-impl From<WaitLsnError> for QueryError {
-    fn from(value: WaitLsnError) -> Self {
-        match value {
-            e @ WaitLsnError::Timeout(_) => Self::Other(anyhow::Error::new(e)),
-            WaitLsnError::Shutdown => Self::Shutdown,
-            WaitLsnError::BadState => Self::Reconnect,
-        }
-    }
-}
-
 impl PageServerHandler {
     pub fn new(
         conf: &'static PageServerConf,
@@ -398,18 +386,12 @@ impl PageServerHandler {
 
     /// Future that completes when we need to shut down the connection.
     ///
-    /// We currently need to shut down when any of the following happens:
-    /// 1. any of the timelines we hold GateGuards for in `shard_timelines` is cancelled
-    /// 2. task_mgr requests shutdown of the connection
+    /// Reasons for need to shut down are:
+    /// - any of the timelines we hold GateGuards for in `shard_timelines` is cancelled
+    /// - task_mgr requests shutdown of the connection
     ///
-    /// NB on (1): the connection's lifecycle is not actually tied to any of the
-    /// `shard_timelines`s' lifecycles. But it's _necessary_ in the current
-    /// implementation to be responsive to timeline cancellation because
-    /// the connection holds their `GateGuards` open (sored in `shard_timelines`).
-    /// We currently do the easy thing and terminate the connection if any of the
-    /// shard_timelines gets cancelled. But really, we cuold spend more effort
-    /// and simply remove the cancelled timeline from the `shard_timelines`, thereby
-    /// dropping the guard.
+    /// The need to check for `task_mgr` cancellation arises mainly from `handle_pagerequests`
+    /// where, at first, `shard_timelines` is empty, see <https://github.com/neondatabase/neon/pull/6388>
     ///
     /// NB: keep in sync with [`Self::is_connection_cancelled`]
     async fn await_connection_cancelled(&self) {
@@ -422,17 +404,16 @@ impl PageServerHandler {
         // immutable &self).  So it's fine to evaluate shard_timelines after the sleep, we don't risk
         // missing any inserts to the map.
 
-        let mut cancellation_sources = Vec::with_capacity(1 + self.shard_timelines.len());
-        use futures::future::Either;
-        cancellation_sources.push(Either::Left(task_mgr::shutdown_watcher()));
-        cancellation_sources.extend(
-            self.shard_timelines
-                .values()
-                .map(|ht| Either::Right(ht.timeline.cancel.cancelled())),
-        );
-        FuturesUnordered::from_iter(cancellation_sources)
-            .next()
-            .await;
+        let mut futs = self
+            .shard_timelines
+            .values()
+            .map(|ht| ht.timeline.cancel.cancelled())
+            .collect::<FuturesUnordered<_>>();
+
+        tokio::select! {
+            _ = task_mgr::shutdown_watcher() => { }
+            _ = futs.next() => {}
+        }
     }
 
     /// Checking variant of [`Self::await_connection_cancelled`].
@@ -648,15 +629,6 @@ impl PageServerHandler {
                         span,
                     )
                 }
-                PagestreamFeMessage::GetSlruSegment(req) => {
-                    let span = tracing::info_span!("handle_get_slru_segment_request", kind = %req.kind, segno = %req.segno, req_lsn = %req.lsn);
-                    (
-                        self.handle_get_slru_segment_request(tenant_id, timeline_id, &req, &ctx)
-                            .instrument(span.clone())
-                            .await,
-                        span,
-                    )
-                }
             };
 
             match response {
@@ -687,10 +659,7 @@ impl PageServerHandler {
                         // print the all details to the log with {:#}, but for the client the
                         // error message is enough.  Do not log if shutting down, as the anyhow::Error
                         // here includes cancellation which is not an error.
-                        let full = utils::error::report_compact_sources(&e);
-                        span.in_scope(|| {
-                            error!("error reading relation or page version: {full:#}")
-                        });
+                        span.in_scope(|| error!("error reading relation or page version: {:#}", e));
                         PagestreamBeMessage::Error(PagestreamErrorResponse {
                             message: e.to_string(),
                         })
@@ -1147,33 +1116,6 @@ impl PageServerHandler {
         }))
     }
 
-    async fn handle_get_slru_segment_request(
-        &mut self,
-        tenant_id: TenantId,
-        timeline_id: TimelineId,
-        req: &PagestreamGetSlruSegmentRequest,
-        ctx: &RequestContext,
-    ) -> Result<PagestreamBeMessage, PageStreamError> {
-        let timeline = self.get_timeline_shard_zero(tenant_id, timeline_id).await?;
-
-        let _timer = timeline
-            .query_metrics
-            .start_timer(metrics::SmgrQueryType::GetSlruSegment);
-
-        let latest_gc_cutoff_lsn = timeline.get_latest_gc_cutoff_lsn();
-        let lsn =
-            Self::wait_or_get_last_lsn(timeline, req.lsn, req.latest, &latest_gc_cutoff_lsn, ctx)
-                .await?;
-
-        let kind = SlruKind::from_repr(req.kind)
-            .ok_or(PageStreamError::BadRequest("invalid SLRU kind".into()))?;
-        let segment = timeline.get_slru_segment(kind, req.segno, lsn, ctx).await?;
-
-        Ok(PagestreamBeMessage::GetSlruSegment(
-            PagestreamGetSlruSegmentResponse { segment },
-        ))
-    }
-
     #[allow(clippy::too_many_arguments)]
     #[instrument(skip_all, fields(?lsn, ?prev_lsn, %full_backup))]
     async fn handle_basebackup_request<IO>(
@@ -1186,7 +1128,7 @@ impl PageServerHandler {
         full_backup: bool,
         gzip: bool,
         ctx: RequestContext,
-    ) -> Result<(), QueryError>
+    ) -> anyhow::Result<()>
     where
         IO: AsyncRead + AsyncWrite + Send + Sync + Unpin,
     {
@@ -1451,7 +1393,7 @@ where
                     )
                     .await?;
                     pgb.write_message_noflush(&BeMessage::CommandComplete(b"SELECT 1"))?;
-                    Result::<(), QueryError>::Ok(())
+                    anyhow::Ok(())
                 },
             )
             .await?;
@@ -1725,7 +1667,6 @@ impl From<GetActiveTenantError> for QueryError {
             | GetActiveTenantError::WillNotBecomeActive(TenantState::Stopping { .. }) => {
                 QueryError::Shutdown
             }
-            e @ GetActiveTenantError::NotFound(_) => QueryError::NotFound(format!("{e}").into()),
             e => QueryError::Other(anyhow::anyhow!(e)),
         }
     }

pageserver/src/pgdatadir_mapping.rs

@@ -12,13 +12,8 @@ use crate::keyspace::{KeySpace, KeySpaceAccum};
 use crate::repository::*;
 use crate::walrecord::NeonWalRecord;
 use anyhow::{ensure, Context};
-use bytes::{Buf, Bytes, BytesMut};
-use pageserver_api::key::{
-    dbdir_key_range, is_rel_block_key, is_slru_block_key, rel_block_to_key, rel_dir_to_key,
-    rel_key_range, rel_size_to_key, relmap_file_key, slru_block_to_key, slru_dir_to_key,
-    slru_segment_key_range, slru_segment_size_to_key, twophase_file_key, twophase_key_range,
-    AUX_FILES_KEY, CHECKPOINT_KEY, CONTROLFILE_KEY, DBDIR_KEY, TWOPHASEDIR_KEY,
-};
+use bytes::{Buf, Bytes};
+use pageserver_api::key::is_rel_block_key;
 use pageserver_api::reltag::{BlockNumber, RelTag, SlruKind};
 use postgres_ffi::relfile_utils::{FSM_FORKNUM, VISIBILITYMAP_FORKNUM};
 use postgres_ffi::BLCKSZ;
@@ -27,7 +22,6 @@ use serde::{Deserialize, Serialize};
 use std::collections::{hash_map, HashMap, HashSet};
 use std::ops::ControlFlow;
 use std::ops::Range;
-use strum::IntoEnumIterator;
 use tokio_util::sync::CancellationToken;
 use tracing::{debug, trace, warn};
 use utils::bin_ser::DeserializeError;
@@ -321,27 +315,6 @@ impl Timeline {
         }
     }
 
-    /// Get the whole SLRU segment
-    pub(crate) async fn get_slru_segment(
-        &self,
-        kind: SlruKind,
-        segno: u32,
-        lsn: Lsn,
-        ctx: &RequestContext,
-    ) -> Result<Bytes, PageReconstructError> {
-        let n_blocks = self
-            .get_slru_segment_size(kind, segno, Version::Lsn(lsn), ctx)
-            .await?;
-        let mut segment = BytesMut::with_capacity(n_blocks as usize * BLCKSZ as usize);
-        for blkno in 0..n_blocks {
-            let block = self
-                .get_slru_page_at_lsn(kind, segno, blkno, lsn, ctx)
-                .await?;
-            segment.extend_from_slice(&block[..BLCKSZ as usize]);
-        }
-        Ok(segment.freeze())
-    }
-
     /// Look up given SLRU page version.
     pub(crate) async fn get_slru_page_at_lsn(
         &self,
@@ -555,33 +528,6 @@ impl Timeline {
         Ok(Default::default())
     }
 
-    pub(crate) async fn get_slru_keyspace(
-        &self,
-        version: Version<'_>,
-        ctx: &RequestContext,
-    ) -> Result<KeySpace, PageReconstructError> {
-        let mut accum = KeySpaceAccum::new();
-
-        for kind in SlruKind::iter() {
-            let mut segments: Vec<u32> = self
-                .list_slru_segments(kind, version, ctx)
-                .await?
-                .into_iter()
-                .collect();
-            segments.sort_unstable();
-
-            for seg in segments {
-                let block_count = self.get_slru_segment_size(kind, seg, version, ctx).await?;
-
-                accum.add_range(
-                    slru_block_to_key(kind, seg, 0)..slru_block_to_key(kind, seg, block_count),
-                );
-            }
-        }
-
-        Ok(accum.to_keyspace())
-    }
-
     /// Get a list of SLRU segments
     pub(crate) async fn list_slru_segments(
         &self,
@@ -1589,6 +1535,366 @@ struct SlruSegmentDirectory {
 
 static ZERO_PAGE: Bytes = Bytes::from_static(&[0u8; BLCKSZ as usize]);
 
+// Layout of the Key address space
+//
+// The Key struct, used to address the underlying key-value store, consists of
+// 18 bytes, split into six fields. See 'Key' in repository.rs. We need to map
+// all the data and metadata keys into those 18 bytes.
+//
+// Principles for the mapping:
+//
+// - Things that are often accessed or modified together, should be close to
+//   each other in the key space. For example, if a relation is extended by one
+//   block, we create a new key-value pair for the block data, and update the
+//   relation size entry. Because of that, the RelSize key comes after all the
+//   RelBlocks of a relation: the RelSize and the last RelBlock are always next
+//   to each other.
+//
+// The key space is divided into four major sections, identified by the first
+// byte, and the form a hierarchy:
+//
+// 00 Relation data and metadata
+//
+//   DbDir    () -> (dbnode, spcnode)
+//   Filenodemap
+//   RelDir   -> relnode forknum
+//       RelBlocks
+//       RelSize
+//
+// 01 SLRUs
+//
+//   SlruDir  kind
+//   SlruSegBlocks segno
+//   SlruSegSize
+//
+// 02 pg_twophase
+//
+// 03 misc
+//    Controlfile
+//    checkpoint
+//    pg_version
+//
+// 04 aux files
+//
+// Below is a full list of the keyspace allocation:
+//
+// DbDir:
+// 00 00000000 00000000 00000000 00   00000000
+//
+// Filenodemap:
+// 00 SPCNODE  DBNODE   00000000 00   00000000
+//
+// RelDir:
+// 00 SPCNODE  DBNODE   00000000 00   00000001 (Postgres never uses relfilenode 0)
+//
+// RelBlock:
+// 00 SPCNODE  DBNODE   RELNODE  FORK BLKNUM
+//
+// RelSize:
+// 00 SPCNODE  DBNODE   RELNODE  FORK FFFFFFFF
+//
+// SlruDir:
+// 01 kind     00000000 00000000 00   00000000
+//
+// SlruSegBlock:
+// 01 kind     00000001 SEGNO    00   BLKNUM
+//
+// SlruSegSize:
+// 01 kind     00000001 SEGNO    00   FFFFFFFF
+//
+// TwoPhaseDir:
+// 02 00000000 00000000 00000000 00   00000000
+//
+// TwoPhaseFile:
+// 02 00000000 00000000 00000000 00   XID
+//
+// ControlFile:
+// 03 00000000 00000000 00000000 00   00000000
+//
+// Checkpoint:
+// 03 00000000 00000000 00000000 00   00000001
+//
+// AuxFiles:
+// 03 00000000 00000000 00000000 00   00000002
+//
+
+//-- Section 01: relation data and metadata
+
+const DBDIR_KEY: Key = Key {
+    field1: 0x00,
+    field2: 0,
+    field3: 0,
+    field4: 0,
+    field5: 0,
+    field6: 0,
+};
+
+fn dbdir_key_range(spcnode: Oid, dbnode: Oid) -> Range<Key> {
+    Key {
+        field1: 0x00,
+        field2: spcnode,
+        field3: dbnode,
+        field4: 0,
+        field5: 0,
+        field6: 0,
+    }..Key {
+        field1: 0x00,
+        field2: spcnode,
+        field3: dbnode,
+        field4: 0xffffffff,
+        field5: 0xff,
+        field6: 0xffffffff,
+    }
+}
+
+fn relmap_file_key(spcnode: Oid, dbnode: Oid) -> Key {
+    Key {
+        field1: 0x00,
+        field2: spcnode,
+        field3: dbnode,
+        field4: 0,
+        field5: 0,
+        field6: 0,
+    }
+}
+
+fn rel_dir_to_key(spcnode: Oid, dbnode: Oid) -> Key {
+    Key {
+        field1: 0x00,
+        field2: spcnode,
+        field3: dbnode,
+        field4: 0,
+        field5: 0,
+        field6: 1,
+    }
+}
+
+pub(crate) fn rel_block_to_key(rel: RelTag, blknum: BlockNumber) -> Key {
+    Key {
+        field1: 0x00,
+        field2: rel.spcnode,
+        field3: rel.dbnode,
+        field4: rel.relnode,
+        field5: rel.forknum,
+        field6: blknum,
+    }
+}
+
+fn rel_size_to_key(rel: RelTag) -> Key {
+    Key {
+        field1: 0x00,
+        field2: rel.spcnode,
+        field3: rel.dbnode,
+        field4: rel.relnode,
+        field5: rel.forknum,
+        field6: 0xffffffff,
+    }
+}
+
+fn rel_key_range(rel: RelTag) -> Range<Key> {
+    Key {
+        field1: 0x00,
+        field2: rel.spcnode,
+        field3: rel.dbnode,
+        field4: rel.relnode,
+        field5: rel.forknum,
+        field6: 0,
+    }..Key {
+        field1: 0x00,
+        field2: rel.spcnode,
+        field3: rel.dbnode,
+        field4: rel.relnode,
+        field5: rel.forknum + 1,
+        field6: 0,
+    }
+}
+
+//-- Section 02: SLRUs
+
+fn slru_dir_to_key(kind: SlruKind) -> Key {
+    Key {
+        field1: 0x01,
+        field2: match kind {
+            SlruKind::Clog => 0x00,
+            SlruKind::MultiXactMembers => 0x01,
+            SlruKind::MultiXactOffsets => 0x02,
+        },
+        field3: 0,
+        field4: 0,
+        field5: 0,
+        field6: 0,
+    }
+}
+
+fn slru_block_to_key(kind: SlruKind, segno: u32, blknum: BlockNumber) -> Key {
+    Key {
+        field1: 0x01,
+        field2: match kind {
+            SlruKind::Clog => 0x00,
+            SlruKind::MultiXactMembers => 0x01,
+            SlruKind::MultiXactOffsets => 0x02,
+        },
+        field3: 1,
+        field4: segno,
+        field5: 0,
+        field6: blknum,
+    }
+}
+
+fn slru_segment_size_to_key(kind: SlruKind, segno: u32) -> Key {
+    Key {
+        field1: 0x01,
+        field2: match kind {
+            SlruKind::Clog => 0x00,
+            SlruKind::MultiXactMembers => 0x01,
+            SlruKind::MultiXactOffsets => 0x02,
+        },
+        field3: 1,
+        field4: segno,
+        field5: 0,
+        field6: 0xffffffff,
+    }
+}
+
+fn slru_segment_key_range(kind: SlruKind, segno: u32) -> Range<Key> {
+    let field2 = match kind {
+        SlruKind::Clog => 0x00,
+        SlruKind::MultiXactMembers => 0x01,
+        SlruKind::MultiXactOffsets => 0x02,
+    };
+
+    Key {
+        field1: 0x01,
+        field2,
+        field3: 1,
+        field4: segno,
+        field5: 0,
+        field6: 0,
+    }..Key {
+        field1: 0x01,
+        field2,
+        field3: 1,
+        field4: segno,
+        field5: 1,
+        field6: 0,
+    }
+}
+
+//-- Section 03: pg_twophase
+
+const TWOPHASEDIR_KEY: Key = Key {
+    field1: 0x02,
+    field2: 0,
+    field3: 0,
+    field4: 0,
+    field5: 0,
+    field6: 0,
+};
+
+fn twophase_file_key(xid: TransactionId) -> Key {
+    Key {
+        field1: 0x02,
+        field2: 0,
+        field3: 0,
+        field4: 0,
+        field5: 0,
+        field6: xid,
+    }
+}
+
+fn twophase_key_range(xid: TransactionId) -> Range<Key> {
+    let (next_xid, overflowed) = xid.overflowing_add(1);
+
+    Key {
+        field1: 0x02,
+        field2: 0,
+        field3: 0,
+        field4: 0,
+        field5: 0,
+        field6: xid,
+    }..Key {
+        field1: 0x02,
+        field2: 0,
+        field3: 0,
+        field4: 0,
+        field5: u8::from(overflowed),
+        field6: next_xid,
+    }
+}
+
+//-- Section 03: Control file
+const CONTROLFILE_KEY: Key = Key {
+    field1: 0x03,
+    field2: 0,
+    field3: 0,
+    field4: 0,
+    field5: 0,
+    field6: 0,
+};
+
+const CHECKPOINT_KEY: Key = Key {
+    field1: 0x03,
+    field2: 0,
+    field3: 0,
+    field4: 0,
+    field5: 0,
+    field6: 1,
+};
+
+const AUX_FILES_KEY: Key = Key {
+    field1: 0x03,
+    field2: 0,
+    field3: 0,
+    field4: 0,
+    field5: 0,
+    field6: 2,
+};
+
+// Reverse mappings for a few Keys.
+// These are needed by WAL redo manager.
+
+// AUX_FILES currently stores only data for logical replication (slots etc), and
+// we don't preserve these on a branch because safekeepers can't follow timeline
+// switch (and generally it likely should be optional), so ignore these.
+pub fn is_inherited_key(key: Key) -> bool {
+    key != AUX_FILES_KEY
+}
+
+pub fn is_rel_fsm_block_key(key: Key) -> bool {
+    key.field1 == 0x00 && key.field4 != 0 && key.field5 == FSM_FORKNUM && key.field6 != 0xffffffff
+}
+
+pub fn is_rel_vm_block_key(key: Key) -> bool {
+    key.field1 == 0x00
+        && key.field4 != 0
+        && key.field5 == VISIBILITYMAP_FORKNUM
+        && key.field6 != 0xffffffff
+}
+
+pub fn key_to_slru_block(key: Key) -> anyhow::Result<(SlruKind, u32, BlockNumber)> {
+    Ok(match key.field1 {
+        0x01 => {
+            let kind = match key.field2 {
+                0x00 => SlruKind::Clog,
+                0x01 => SlruKind::MultiXactMembers,
+                0x02 => SlruKind::MultiXactOffsets,
+                _ => anyhow::bail!("unrecognized slru kind 0x{:02x}", key.field2),
+            };
+            let segno = key.field4;
+            let blknum = key.field6;
+
+            (kind, segno, blknum)
+        }
+        _ => anyhow::bail!("unexpected value kind 0x{:02x}", key.field1),
+    })
+}
+
+fn is_slru_block_key(key: Key) -> bool {
+    key.field1 == 0x01                // SLRU-related
+        && key.field3 == 0x00000001   // but not SlruDir
+        && key.field6 != 0xffffffff // and not SlruSegSize
+}
+
 #[allow(clippy::bool_assert_comparison)]
 #[cfg(test)]
 mod tests {

pageserver/src/tenant.rs

@@ -20,7 +20,6 @@ use futures::FutureExt;
 use futures::StreamExt;
 use pageserver_api::models;
 use pageserver_api::models::TimelineState;
-use pageserver_api::models::WalRedoManagerStatus;
 use pageserver_api::shard::ShardIdentity;
 use pageserver_api::shard::TenantShardId;
 use remote_storage::DownloadError;
@@ -92,6 +91,7 @@ use std::fs;
 use std::fs::File;
 use std::io;
 use std::ops::Bound::Included;
+use std::process::Stdio;
 use std::sync::atomic::AtomicU64;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
@@ -365,14 +365,6 @@ impl WalRedoManager {
             }
         }
     }
-
-    pub(crate) fn status(&self) -> Option<WalRedoManagerStatus> {
-        match self {
-            WalRedoManager::Prod(m) => m.status(),
-            #[cfg(test)]
-            WalRedoManager::Test(_) => None,
-        }
-    }
 }
 
 #[derive(Debug, thiserror::Error, PartialEq, Eq)]
@@ -636,15 +628,9 @@ impl Tenant {
             deletion_queue_client,
         ));
 
-        // The attach task will carry a GateGuard, so that shutdown() reliably waits for it to drop out if
-        // we shut down while attaching.
-        let Ok(attach_gate_guard) = tenant.gate.enter() else {
-            // We just created the Tenant: nothing else can have shut it down yet
-            unreachable!();
-        };
-
         // Do all the hard work in the background
         let tenant_clone = Arc::clone(&tenant);
+
         let ctx = ctx.detached_child(TaskKind::Attach, DownloadBehavior::Warn);
         task_mgr::spawn(
             &tokio::runtime::Handle::current(),
@@ -654,8 +640,6 @@ impl Tenant {
             "attach tenant",
             false,
             async move {
-                let _gate_guard = attach_gate_guard;
-
                 // Is this tenant being spawned as part of process startup?
                 let starting_up = init_order.is_some();
                 scopeguard::defer! {
@@ -732,10 +716,6 @@ impl Tenant {
                             // stayed in Activating for such a long time that shutdown found it in
                             // that state.
                             tracing::info!(state=%tenant_clone.current_state(), "Tenant shut down before activation");
-                            // Make the tenant broken so that set_stopping will not hang waiting for it to leave
-                            // the Attaching state.  This is an over-reaction (nothing really broke, the tenant is
-                            // just shutting down), but ensures progress.
-                            make_broken(&tenant_clone, anyhow::anyhow!("Shut down while Attaching"));
                             return Ok(());
                         },
                     )
@@ -830,7 +810,7 @@ impl Tenant {
                     SpawnMode::Create => None,
                     SpawnMode::Normal => {Some(TENANT.attach.start_timer())}
                 };
-                match tenant_clone.attach(preload, mode, &ctx).await {
+                match tenant_clone.attach(preload, &ctx).await {
                     Ok(()) => {
                         info!("attach finished, activating");
                         if let Some(t)=  attach_timer {t.observe_duration();}
@@ -917,20 +897,15 @@ impl Tenant {
     async fn attach(
         self: &Arc<Tenant>,
         preload: Option<TenantPreload>,
-        mode: SpawnMode,
         ctx: &RequestContext,
     ) -> anyhow::Result<()> {
         span::debug_assert_current_span_has_tenant_id();
 
         failpoint_support::sleep_millis_async!("before-attaching-tenant");
 
-        let preload = match (preload, mode) {
-            (Some(p), _) => p,
-            (None, SpawnMode::Create) => TenantPreload {
-                deleting: false,
-                timelines: HashMap::new(),
-            },
-            (None, SpawnMode::Normal) => {
+        let preload = match preload {
+            Some(p) => p,
+            None => {
                 // Deprecated dev mode: load from local disk state instead of remote storage
                 // https://github.com/neondatabase/neon/issues/5624
                 return self.load_local(ctx).await;
@@ -1029,7 +1004,6 @@ impl Tenant {
                 Some(remote_timeline_client),
                 self.deletion_queue_client.clone(),
             )
-            .instrument(tracing::info_span!("timeline_delete", %timeline_id))
             .await
             .context("resume_deletion")
             .map_err(LoadLocalTimelineError::ResumeDeletion)?;
@@ -1039,10 +1013,7 @@ impl Tenant {
         // IndexPart is the source of truth.
         self.clean_up_timelines(&existent_timelines)?;
 
-        fail::fail_point!("attach-before-activate", |_| {
-            anyhow::bail!("attach-before-activate");
-        });
-        failpoint_support::sleep_millis_async!("attach-before-activate-sleep", &self.cancel);
+        failpoint_support::sleep_millis_async!("attach-before-activate", &self.cancel);
 
         info!("Done");
 
@@ -1706,13 +1677,9 @@ impl Tenant {
         ctx: &RequestContext,
     ) -> Result<Arc<Timeline>, CreateTimelineError> {
         if !self.is_active() {
-            if matches!(self.current_state(), TenantState::Stopping { .. }) {
-                return Err(CreateTimelineError::ShuttingDown);
-            } else {
-                return Err(CreateTimelineError::Other(anyhow::anyhow!(
-                    "Cannot create timelines on inactive tenant"
-                )));
-            }
+            return Err(CreateTimelineError::Other(anyhow::anyhow!(
+                "Cannot create timelines on inactive tenant"
+            )));
         }
 
         let _gate = self
@@ -1966,10 +1933,6 @@ impl Tenant {
         self.generation
     }
 
-    pub(crate) fn wal_redo_manager_status(&self) -> Option<WalRedoManagerStatus> {
-        self.walredo_mgr.status()
-    }
-
     /// Changes tenant status to active, unless shutdown was already requested.
     ///
     /// `background_jobs_can_start` is an optional barrier set to a value during pageserver startup
@@ -2107,10 +2070,7 @@ impl Tenant {
             let timelines = self.timelines.lock().unwrap();
             timelines.values().for_each(|timeline| {
                 let timeline = Arc::clone(timeline);
-                let timeline_id = timeline.timeline_id;
-
-                let span =
-                    tracing::info_span!("timeline_shutdown", %timeline_id, ?freeze_and_flush);
+                let span = Span::current();
                 js.spawn(async move {
                     if freeze_and_flush {
                         timeline.flush_and_shutdown().instrument(span).await
@@ -2710,7 +2670,7 @@ impl Tenant {
             activate_now_sem: tokio::sync::Semaphore::new(0),
             delete_progress: Arc::new(tokio::sync::Mutex::new(DeleteTenantFlow::default())),
             cancel: CancellationToken::default(),
-            gate: Gate::default(),
+            gate: Gate::new(format!("Tenant<{tenant_shard_id}>")),
         }
     }
 
@@ -3795,30 +3755,27 @@ async fn run_initdb(
         .env_clear()
         .env("LD_LIBRARY_PATH", &initdb_lib_dir)
         .env("DYLD_LIBRARY_PATH", &initdb_lib_dir)
-        .stdin(std::process::Stdio::null())
-        // stdout invocation produces the same output every time, we don't need it
-        .stdout(std::process::Stdio::null())
-        // we would be interested in the stderr output, if there was any
-        .stderr(std::process::Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        // If the `select!` below doesn't finish the `wait_with_output`,
+        // let the task get `wait()`ed for asynchronously by tokio.
+        // This means there is a slim chance we can go over the INIT_DB_SEMAPHORE.
+        // TODO: fix for this is non-trivial, see
+        // https://github.com/neondatabase/neon/pull/5921#pullrequestreview-1750858021
+        //
+        .kill_on_drop(true)
         .spawn()?;
 
-    // Ideally we'd select here with the cancellation token, but the problem is that
-    // we can't safely terminate initdb: it launches processes of its own, and killing
-    // initdb doesn't kill them. After we return from this function, we want the target
-    // directory to be able to be cleaned up.
-    // See https://github.com/neondatabase/neon/issues/6385
-    let initdb_output = initdb_command.wait_with_output().await?;
-    if !initdb_output.status.success() {
-        return Err(InitdbError::Failed(
-            initdb_output.status,
-            initdb_output.stderr,
-        ));
-    }
-
-    // This isn't true cancellation support, see above. Still return an error to
-    // excercise the cancellation code path.
-    if cancel.is_cancelled() {
-        return Err(InitdbError::Cancelled);
+    tokio::select! {
+        initdb_output = initdb_command.wait_with_output() => {
+            let initdb_output = initdb_output?;
+            if !initdb_output.status.success() {
+                return Err(InitdbError::Failed(initdb_output.status, initdb_output.stderr));
+            }
+        }
+        _ = cancel.cancelled() => {
+            return Err(InitdbError::Cancelled);
+        }
     }
 
     Ok(())
@@ -3920,7 +3877,6 @@ pub(crate) mod harness {
                 ),
                 gc_feedback: Some(tenant_conf.gc_feedback),
                 heatmap_period: Some(tenant_conf.heatmap_period),
-                lazy_slru_download: Some(tenant_conf.lazy_slru_download),
             }
         }
     }
@@ -4075,7 +4031,7 @@ pub(crate) mod harness {
                         .instrument(info_span!("try_load_preload", tenant_id=%self.tenant_shard_id.tenant_id, shard_id=%self.tenant_shard_id.shard_slug()))
                         .await?;
                     tenant
-                        .attach(Some(preload), SpawnMode::Normal, ctx)
+                        .attach(Some(preload), ctx)
                         .instrument(info_span!("try_load", tenant_id=%self.tenant_shard_id.tenant_id, shard_id=%self.tenant_shard_id.shard_slug()))
                         .await?;
                 }
@@ -5243,7 +5199,7 @@ mod tests {
             let raw_tline = tline.raw_timeline().unwrap();
             raw_tline
                 .shutdown()
-                .instrument(info_span!("test_shutdown", tenant_id=%raw_tline.tenant_shard_id, timeline_id=%TIMELINE_ID))
+                .instrument(info_span!("test_shutdown", tenant_id=%raw_tline.tenant_shard_id))
                 .await;
             std::mem::forget(tline);
         }

pageserver/src/tenant/block_io.rs

@@ -5,10 +5,10 @@
 use super::ephemeral_file::EphemeralFile;
 use super::storage_layer::delta_layer::{Adapter, DeltaLayerInner};
 use crate::context::RequestContext;
-use crate::page_cache::{self, PageReadGuard, PageWriteGuard, ReadBufResult, PAGE_SZ};
+use crate::page_cache::{self, PageReadGuard, ReadBufResult, PAGE_SZ};
 use crate::virtual_file::VirtualFile;
 use bytes::Bytes;
-use std::ops::Deref;
+use std::ops::{Deref, DerefMut};
 
 /// This is implemented by anything that can read 8 kB (PAGE_SZ)
 /// blocks, using the page cache
@@ -39,8 +39,6 @@ pub enum BlockLease<'a> {
     EphemeralFileMutableTail(&'a [u8; PAGE_SZ]),
     #[cfg(test)]
     Arc(std::sync::Arc<[u8; PAGE_SZ]>),
-    #[cfg(test)]
-    Vec(Vec<u8>),
 }
 
 impl From<PageReadGuard<'static>> for BlockLease<'static> {
@@ -65,10 +63,6 @@ impl<'a> Deref for BlockLease<'a> {
             BlockLease::EphemeralFileMutableTail(v) => v,
             #[cfg(test)]
             BlockLease::Arc(v) => v.deref(),
-            #[cfg(test)]
-            BlockLease::Vec(v) => {
-                TryFrom::try_from(&v[..]).expect("caller must ensure that v has PAGE_SZ")
-            }
         }
     }
 }
@@ -175,14 +169,10 @@ impl FileBlockReader {
     }
 
     /// Read a page from the underlying file into given buffer.
-    async fn fill_buffer(
-        &self,
-        buf: PageWriteGuard<'static>,
-        blkno: u32,
-    ) -> Result<PageWriteGuard<'static>, std::io::Error> {
+    async fn fill_buffer(&self, buf: &mut [u8], blkno: u32) -> Result<(), std::io::Error> {
         assert!(buf.len() == PAGE_SZ);
         self.file
-            .read_exact_at_page(buf, blkno as u64 * PAGE_SZ as u64)
+            .read_exact_at(buf, blkno as u64 * PAGE_SZ as u64)
             .await
     }
     /// Read a block.
@@ -206,9 +196,9 @@ impl FileBlockReader {
                 )
             })? {
             ReadBufResult::Found(guard) => Ok(guard.into()),
-            ReadBufResult::NotFound(write_guard) => {
+            ReadBufResult::NotFound(mut write_guard) => {
                 // Read the page from disk into the buffer
-                let write_guard = self.fill_buffer(write_guard, blknum).await?;
+                self.fill_buffer(write_guard.deref_mut(), blknum).await?;
                 Ok(write_guard.mark_valid().into())
             }
         }

pageserver/src/tenant/config.rs

@@ -345,9 +345,6 @@ pub struct TenantConf {
     /// may be disabled if a Tenant will not have secondary locations: only secondary
     /// locations will use the heatmap uploaded by attached locations.
     pub heatmap_period: Duration,
-
-    /// If true then SLRU segments are dowloaded on demand, if false SLRU segments are included in basebackup
-    pub lazy_slru_download: bool,
 }
 
 /// Same as TenantConf, but this struct preserves the information about
@@ -433,10 +430,6 @@ pub struct TenantConfOpt {
     #[serde(with = "humantime_serde")]
     #[serde(default)]
     pub heatmap_period: Option<Duration>,
-
-    #[serde(skip_serializing_if = "Option::is_none")]
-    #[serde(default)]
-    pub lazy_slru_download: Option<bool>,
 }
 
 impl TenantConfOpt {
@@ -482,9 +475,6 @@ impl TenantConfOpt {
                 .unwrap_or(global_conf.evictions_low_residence_duration_metric_threshold),
             gc_feedback: self.gc_feedback.unwrap_or(global_conf.gc_feedback),
             heatmap_period: self.heatmap_period.unwrap_or(global_conf.heatmap_period),
-            lazy_slru_download: self
-                .lazy_slru_download
-                .unwrap_or(global_conf.lazy_slru_download),
         }
     }
 }
@@ -523,7 +513,6 @@ impl Default for TenantConf {
             .expect("cannot parse default evictions_low_residence_duration_metric_threshold"),
             gc_feedback: false,
             heatmap_period: Duration::ZERO,
-            lazy_slru_download: false,
         }
     }
 }
@@ -595,7 +584,6 @@ impl From<TenantConfOpt> for models::TenantConfig {
                 .map(humantime),
             gc_feedback: value.gc_feedback,
             heatmap_period: value.heatmap_period.map(humantime),
-            lazy_slru_download: value.lazy_slru_download,
         }
     }
 }

pageserver/src/tenant/delete.rs

@@ -136,11 +136,7 @@ async fn schedule_ordered_timeline_deletions(
     let mut already_running_deletions = vec![];
 
     for (timeline_id, _) in sorted.into_iter().rev() {
-        let span = tracing::info_span!("timeline_delete", %timeline_id);
-        let res = DeleteTimelineFlow::run(tenant, timeline_id, true)
-            .instrument(span)
-            .await;
-        if let Err(e) = res {
+        if let Err(e) = DeleteTimelineFlow::run(tenant, timeline_id, true).await {
             match e {
                 DeleteTimelineError::NotFound => {
                     // Timeline deletion finished after call to clone above but before call
@@ -413,10 +409,7 @@ impl DeleteTenantFlow {
             .await
             .expect("cant be stopping or broken");
 
-        tenant
-            .attach(preload, super::SpawnMode::Normal, ctx)
-            .await
-            .context("attach")?;
+        tenant.attach(preload, ctx).await.context("attach")?;
 
         Self::background(
             guard,

pageserver/src/tenant/ephemeral_file.rs

@@ -5,11 +5,11 @@ use crate::config::PageServerConf;
 use crate::context::RequestContext;
 use crate::page_cache::{self, PAGE_SZ};
 use crate::tenant::block_io::{BlockCursor, BlockLease, BlockReader};
-use crate::virtual_file::{self, VirtualFile};
+use crate::virtual_file::VirtualFile;
 use camino::Utf8PathBuf;
 use pageserver_api::shard::TenantShardId;
 use std::cmp::min;
-
+use std::fs::OpenOptions;
 use std::io::{self, ErrorKind};
 use std::ops::DerefMut;
 use std::sync::atomic::AtomicU64;
@@ -47,10 +47,7 @@ impl EphemeralFile {
 
         let file = VirtualFile::open_with_options(
             &filename,
-            virtual_file::OpenOptions::new()
-                .read(true)
-                .write(true)
-                .create(true),
+            OpenOptions::new().read(true).write(true).create(true),
         )
         .await?;
 
@@ -92,10 +89,11 @@ impl EphemeralFile {
                 page_cache::ReadBufResult::Found(guard) => {
                     return Ok(BlockLease::PageReadGuard(guard))
                 }
-                page_cache::ReadBufResult::NotFound(write_guard) => {
-                    let write_guard = self
-                        .file
-                        .read_exact_at_page(write_guard, blknum as u64 * PAGE_SZ as u64)
+                page_cache::ReadBufResult::NotFound(mut write_guard) => {
+                    let buf: &mut [u8] = write_guard.deref_mut();
+                    debug_assert_eq!(buf.len(), PAGE_SZ);
+                    self.file
+                        .read_exact_at(&mut buf[..], blknum as u64 * PAGE_SZ as u64)
                         .await?;
                     let read_guard = write_guard.mark_valid();
                     return Ok(BlockLease::PageReadGuard(read_guard));

pageserver/src/tenant/layer_map.rs

@@ -51,10 +51,7 @@ use crate::keyspace::KeyPartitioning;
 use crate::repository::Key;
 use crate::tenant::storage_layer::InMemoryLayer;
 use anyhow::Result;
-use pageserver_api::keyspace::KeySpaceAccum;
-use std::cmp::Ordering;
-use std::collections::{BTreeMap, VecDeque};
-use std::iter::Peekable;
+use std::collections::VecDeque;
 use std::ops::Range;
 use std::sync::Arc;
 use utils::lsn::Lsn;
@@ -147,221 +144,11 @@ impl Drop for BatchedUpdates<'_> {
 }
 
 /// Return value of LayerMap::search
-#[derive(Eq, PartialEq, Debug)]
 pub struct SearchResult {
     pub layer: Arc<PersistentLayerDesc>,
     pub lsn_floor: Lsn,
 }
 
-pub struct OrderedSearchResult(SearchResult);
-
-impl Ord for OrderedSearchResult {
-    fn cmp(&self, other: &Self) -> Ordering {
-        self.0.lsn_floor.cmp(&other.0.lsn_floor)
-    }
-}
-
-impl PartialOrd for OrderedSearchResult {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
-impl PartialEq for OrderedSearchResult {
-    fn eq(&self, other: &Self) -> bool {
-        self.0.lsn_floor == other.0.lsn_floor
-    }
-}
-
-impl Eq for OrderedSearchResult {}
-
-pub struct RangeSearchResult {
-    pub found: BTreeMap<OrderedSearchResult, KeySpaceAccum>,
-    pub not_found: KeySpaceAccum,
-}
-
-impl RangeSearchResult {
-    fn new() -> Self {
-        Self {
-            found: BTreeMap::new(),
-            not_found: KeySpaceAccum::new(),
-        }
-    }
-}
-
-/// Collector for results of range search queries on the LayerMap.
-/// It should be provided with two iterators for the delta and image coverage
-/// that contain all the changes for layers which intersect the range.
-struct RangeSearchCollector<Iter>
-where
-    Iter: Iterator<Item = (i128, Option<Arc<PersistentLayerDesc>>)>,
-{
-    delta_coverage: Peekable<Iter>,
-    image_coverage: Peekable<Iter>,
-    key_range: Range<Key>,
-    end_lsn: Lsn,
-
-    current_delta: Option<Arc<PersistentLayerDesc>>,
-    current_image: Option<Arc<PersistentLayerDesc>>,
-
-    result: RangeSearchResult,
-}
-
-#[derive(Debug)]
-enum NextLayerType {
-    Delta(i128),
-    Image(i128),
-    Both(i128),
-}
-
-impl NextLayerType {
-    fn next_change_at_key(&self) -> Key {
-        match self {
-            NextLayerType::Delta(at) => Key::from_i128(*at),
-            NextLayerType::Image(at) => Key::from_i128(*at),
-            NextLayerType::Both(at) => Key::from_i128(*at),
-        }
-    }
-}
-
-impl<Iter> RangeSearchCollector<Iter>
-where
-    Iter: Iterator<Item = (i128, Option<Arc<PersistentLayerDesc>>)>,
-{
-    fn new(
-        key_range: Range<Key>,
-        end_lsn: Lsn,
-        delta_coverage: Iter,
-        image_coverage: Iter,
-    ) -> Self {
-        Self {
-            delta_coverage: delta_coverage.peekable(),
-            image_coverage: image_coverage.peekable(),
-            key_range,
-            end_lsn,
-            current_delta: None,
-            current_image: None,
-            result: RangeSearchResult::new(),
-        }
-    }
-
-    /// Run the collector. Collection is implemented via a two pointer algorithm.
-    /// One pointer tracks the start of the current range and the other tracks
-    /// the beginning of the next range which will overlap with the next change
-    /// in coverage across both image and delta.
-    fn collect(mut self) -> RangeSearchResult {
-        let next_layer_type = self.choose_next_layer_type();
-        let mut current_range_start = match next_layer_type {
-            None => {
-                // No changes for the range
-                self.pad_range(self.key_range.clone());
-                return self.result;
-            }
-            Some(layer_type) if self.key_range.end <= layer_type.next_change_at_key() => {
-                // Changes only after the end of the range
-                self.pad_range(self.key_range.clone());
-                return self.result;
-            }
-            Some(layer_type) => {
-                // Changes for the range exist. Record anything before the first
-                // coverage change as not found.
-                let coverage_start = layer_type.next_change_at_key();
-                let range_before = self.key_range.start..coverage_start;
-                self.pad_range(range_before);
-
-                self.advance(&layer_type);
-                coverage_start
-            }
-        };
-
-        while current_range_start < self.key_range.end {
-            let next_layer_type = self.choose_next_layer_type();
-            match next_layer_type {
-                Some(t) => {
-                    let current_range_end = t.next_change_at_key();
-                    self.add_range(current_range_start..current_range_end);
-                    current_range_start = current_range_end;
-
-                    self.advance(&t);
-                }
-                None => {
-                    self.add_range(current_range_start..self.key_range.end);
-                    current_range_start = self.key_range.end;
-                }
-            }
-        }
-
-        self.result
-    }
-
-    /// Mark a range as not found (i.e. no layers intersect it)
-    fn pad_range(&mut self, key_range: Range<Key>) {
-        if !key_range.is_empty() {
-            self.result.not_found.add_range(key_range);
-        }
-    }
-
-    /// Select the appropiate layer for the given range and update
-    /// the collector.
-    fn add_range(&mut self, covered_range: Range<Key>) {
-        let selected = LayerMap::select_layer(
-            self.current_delta.clone(),
-            self.current_image.clone(),
-            self.end_lsn,
-        );
-
-        match selected {
-            Some(search_result) => self
-                .result
-                .found
-                .entry(OrderedSearchResult(search_result))
-                .or_default()
-                .add_range(covered_range),
-            None => self.pad_range(covered_range),
-        }
-    }
-
-    /// Move to the next coverage change.
-    fn advance(&mut self, layer_type: &NextLayerType) {
-        match layer_type {
-            NextLayerType::Delta(_) => {
-                let (_, layer) = self.delta_coverage.next().unwrap();
-                self.current_delta = layer;
-            }
-            NextLayerType::Image(_) => {
-                let (_, layer) = self.image_coverage.next().unwrap();
-                self.current_image = layer;
-            }
-            NextLayerType::Both(_) => {
-                let (_, image_layer) = self.image_coverage.next().unwrap();
-                let (_, delta_layer) = self.delta_coverage.next().unwrap();
-
-                self.current_image = image_layer;
-                self.current_delta = delta_layer;
-            }
-        }
-    }
-
-    /// Pick the next coverage change: the one at the lesser key or both if they're alligned.
-    fn choose_next_layer_type(&mut self) -> Option<NextLayerType> {
-        let next_delta_at = self.delta_coverage.peek().map(|(key, _)| key);
-        let next_image_at = self.image_coverage.peek().map(|(key, _)| key);
-
-        match (next_delta_at, next_image_at) {
-            (None, None) => None,
-            (Some(next_delta_at), None) => Some(NextLayerType::Delta(*next_delta_at)),
-            (None, Some(next_image_at)) => Some(NextLayerType::Image(*next_image_at)),
-            (Some(next_delta_at), Some(next_image_at)) if next_image_at < next_delta_at => {
-                Some(NextLayerType::Image(*next_image_at))
-            }
-            (Some(next_delta_at), Some(next_image_at)) if next_delta_at < next_image_at => {
-                Some(NextLayerType::Delta(*next_delta_at))
-            }
-            (Some(next_delta_at), Some(_)) => Some(NextLayerType::Both(*next_delta_at)),
-        }
-    }
-}
-
 impl LayerMap {
     ///
     /// Find the latest layer (by lsn.end) that covers the given
@@ -399,18 +186,7 @@ impl LayerMap {
         let latest_delta = version.delta_coverage.query(key.to_i128());
         let latest_image = version.image_coverage.query(key.to_i128());
 
-        Self::select_layer(latest_delta, latest_image, end_lsn)
-    }
-
-    fn select_layer(
-        delta_layer: Option<Arc<PersistentLayerDesc>>,
-        image_layer: Option<Arc<PersistentLayerDesc>>,
-        end_lsn: Lsn,
-    ) -> Option<SearchResult> {
-        assert!(delta_layer.as_ref().map_or(true, |l| l.is_delta()));
-        assert!(image_layer.as_ref().map_or(true, |l| !l.is_delta()));
-
-        match (delta_layer, image_layer) {
+        match (latest_delta, latest_image) {
             (None, None) => None,
             (None, Some(image)) => {
                 let lsn_floor = image.get_lsn_range().start;
@@ -447,17 +223,6 @@ impl LayerMap {
         }
     }
 
-    pub fn range_search(&self, key_range: Range<Key>, end_lsn: Lsn) -> Option<RangeSearchResult> {
-        let version = self.historic.get().unwrap().get_version(end_lsn.0 - 1)?;
-
-        let raw_range = key_range.start.to_i128()..key_range.end.to_i128();
-        let delta_changes = version.delta_coverage.range_overlaps(&raw_range);
-        let image_changes = version.image_coverage.range_overlaps(&raw_range);
-
-        let collector = RangeSearchCollector::new(key_range, end_lsn, delta_changes, image_changes);
-        Some(collector.collect())
-    }
-
     /// Start a batch of updates, applied on drop
     pub fn batch_update(&mut self) -> BatchedUpdates<'_> {
         BatchedUpdates { layer_map: self }
@@ -518,15 +283,15 @@ impl LayerMap {
     ///
     /// This is used for garbage collection, to determine if an old layer can
     /// be deleted.
-    pub fn image_layer_exists(&self, key: &Range<Key>, lsn: &Range<Lsn>) -> bool {
+    pub fn image_layer_exists(&self, key: &Range<Key>, lsn: &Range<Lsn>) -> Result<bool> {
         if key.is_empty() {
             // Vacuously true. There's a newer image for all 0 of the kerys in the range.
-            return true;
+            return Ok(true);
         }
 
         let version = match self.historic.get().unwrap().get_version(lsn.end.0 - 1) {
             Some(v) => v,
-            None => return false,
+            None => return Ok(false),
         };
 
         let start = key.start.to_i128();
@@ -539,17 +304,17 @@ impl LayerMap {
 
         // Check the start is covered
         if !layer_covers(version.image_coverage.query(start)) {
-            return false;
+            return Ok(false);
         }
 
         // Check after all changes of coverage
         for (_, change_val) in version.image_coverage.range(start..end) {
             if !layer_covers(change_val) {
-                return false;
+                return Ok(false);
             }
         }
 
-        true
+        Ok(true)
     }
 
     pub fn iter_historic_layers(&self) -> impl '_ + Iterator<Item = Arc<PersistentLayerDesc>> {
@@ -560,14 +325,18 @@ impl LayerMap {
     /// Divide the whole given range of keys into sub-ranges based on the latest
     /// image layer that covers each range at the specified lsn (inclusive).
     /// This is used when creating  new image layers.
+    ///
+    // FIXME: clippy complains that the result type is very complex. She's probably
+    // right...
+    #[allow(clippy::type_complexity)]
     pub fn image_coverage(
         &self,
         key_range: &Range<Key>,
         lsn: Lsn,
-    ) -> Vec<(Range<Key>, Option<Arc<PersistentLayerDesc>>)> {
+    ) -> Result<Vec<(Range<Key>, Option<Arc<PersistentLayerDesc>>)>> {
         let version = match self.historic.get().unwrap().get_version(lsn.0) {
             Some(v) => v,
-            None => return vec![],
+            None => return Ok(vec![]),
         };
 
         let start = key_range.start.to_i128();
@@ -590,7 +359,7 @@ impl LayerMap {
         let kr = Key::from_i128(current_key)..Key::from_i128(end);
         coverage.push((kr, current_val.take()));
 
-        coverage
+        Ok(coverage)
     }
 
     pub fn is_l0(layer: &PersistentLayerDesc) -> bool {
@@ -641,19 +410,24 @@ impl LayerMap {
     /// This number is used to compute the largest number of deltas that
     /// we'll need to visit for any page reconstruction in this region.
     /// We use this heuristic to decide whether to create an image layer.
-    pub fn count_deltas(&self, key: &Range<Key>, lsn: &Range<Lsn>, limit: Option<usize>) -> usize {
+    pub fn count_deltas(
+        &self,
+        key: &Range<Key>,
+        lsn: &Range<Lsn>,
+        limit: Option<usize>,
+    ) -> Result<usize> {
         // We get the delta coverage of the region, and for each part of the coverage
         // we recurse right underneath the delta. The recursion depth is limited by
         // the largest result this function could return, which is in practice between
         // 3 and 10 (since we usually try to create an image when the number gets larger).
 
         if lsn.is_empty() || key.is_empty() || limit == Some(0) {
-            return 0;
+            return Ok(0);
         }
 
         let version = match self.historic.get().unwrap().get_version(lsn.end.0 - 1) {
             Some(v) => v,
-            None => return 0,
+            None => return Ok(0),
         };
 
         let start = key.start.to_i128();
@@ -674,7 +448,8 @@ impl LayerMap {
                     if !kr.is_empty() {
                         let base_count = Self::is_reimage_worthy(&val, key) as usize;
                         let new_limit = limit.map(|l| l - base_count);
-                        let max_stacked_deltas_underneath = self.count_deltas(&kr, &lr, new_limit);
+                        let max_stacked_deltas_underneath =
+                            self.count_deltas(&kr, &lr, new_limit)?;
                         max_stacked_deltas = std::cmp::max(
                             max_stacked_deltas,
                             base_count + max_stacked_deltas_underneath,
@@ -696,7 +471,7 @@ impl LayerMap {
                 if !kr.is_empty() {
                     let base_count = Self::is_reimage_worthy(&val, key) as usize;
                     let new_limit = limit.map(|l| l - base_count);
-                    let max_stacked_deltas_underneath = self.count_deltas(&kr, &lr, new_limit);
+                    let max_stacked_deltas_underneath = self.count_deltas(&kr, &lr, new_limit)?;
                     max_stacked_deltas = std::cmp::max(
                         max_stacked_deltas,
                         base_count + max_stacked_deltas_underneath,
@@ -705,7 +480,7 @@ impl LayerMap {
             }
         }
 
-        max_stacked_deltas
+        Ok(max_stacked_deltas)
     }
 
     /// Count how many reimage-worthy layers we need to visit for given key-lsn pair.
@@ -817,7 +592,10 @@ impl LayerMap {
                     if limit == Some(difficulty) {
                         break;
                     }
-                    for (img_range, last_img) in self.image_coverage(range, lsn) {
+                    for (img_range, last_img) in self
+                        .image_coverage(range, lsn)
+                        .expect("why would this err?")
+                    {
                         if limit == Some(difficulty) {
                             break;
                         }
@@ -828,7 +606,9 @@ impl LayerMap {
                         };
 
                         if img_lsn < lsn {
-                            let num_deltas = self.count_deltas(&img_range, &(img_lsn..lsn), limit);
+                            let num_deltas = self
+                                .count_deltas(&img_range, &(img_lsn..lsn), limit)
+                                .expect("why would this err lol?");
                             difficulty = std::cmp::max(difficulty, num_deltas);
                         }
                     }
@@ -866,126 +646,3 @@ impl LayerMap {
         Ok(())
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[derive(Clone)]
-    struct LayerDesc {
-        key_range: Range<Key>,
-        lsn_range: Range<Lsn>,
-        is_delta: bool,
-    }
-
-    fn create_layer_map(layers: Vec<LayerDesc>) -> LayerMap {
-        let mut layer_map = LayerMap::default();
-
-        for layer in layers {
-            layer_map.insert_historic_noflush(PersistentLayerDesc::new_test(
-                layer.key_range,
-                layer.lsn_range,
-                layer.is_delta,
-            ));
-        }
-
-        layer_map.flush_updates();
-        layer_map
-    }
-
-    fn assert_range_search_result_eq(lhs: RangeSearchResult, rhs: RangeSearchResult) {
-        assert_eq!(lhs.not_found.to_keyspace(), rhs.not_found.to_keyspace());
-        let lhs: Vec<_> = lhs
-            .found
-            .into_iter()
-            .map(|(search_result, accum)| (search_result.0, accum.to_keyspace()))
-            .collect();
-        let rhs: Vec<_> = rhs
-            .found
-            .into_iter()
-            .map(|(search_result, accum)| (search_result.0, accum.to_keyspace()))
-            .collect();
-
-        assert_eq!(lhs, rhs);
-    }
-
-    fn brute_force_range_search(
-        layer_map: &LayerMap,
-        key_range: Range<Key>,
-        end_lsn: Lsn,
-    ) -> RangeSearchResult {
-        let mut range_search_result = RangeSearchResult::new();
-
-        let mut key = key_range.start;
-        while key != key_range.end {
-            let res = layer_map.search(key, end_lsn);
-            match res {
-                Some(res) => {
-                    range_search_result
-                        .found
-                        .entry(OrderedSearchResult(res))
-                        .or_default()
-                        .add_key(key);
-                }
-                None => {
-                    range_search_result.not_found.add_key(key);
-                }
-            }
-
-            key = key.next();
-        }
-
-        range_search_result
-    }
-
-    #[test]
-    fn ranged_search_on_empty_layer_map() {
-        let layer_map = LayerMap::default();
-        let range = Key::from_i128(100)..Key::from_i128(200);
-
-        let res = layer_map.range_search(range, Lsn(100));
-        assert!(res.is_none());
-    }
-
-    #[test]
-    fn ranged_search() {
-        let layers = vec![
-            LayerDesc {
-                key_range: Key::from_i128(15)..Key::from_i128(50),
-                lsn_range: Lsn(0)..Lsn(5),
-                is_delta: false,
-            },
-            LayerDesc {
-                key_range: Key::from_i128(10)..Key::from_i128(20),
-                lsn_range: Lsn(5)..Lsn(20),
-                is_delta: true,
-            },
-            LayerDesc {
-                key_range: Key::from_i128(15)..Key::from_i128(25),
-                lsn_range: Lsn(20)..Lsn(30),
-                is_delta: true,
-            },
-            LayerDesc {
-                key_range: Key::from_i128(35)..Key::from_i128(40),
-                lsn_range: Lsn(25)..Lsn(35),
-                is_delta: true,
-            },
-            LayerDesc {
-                key_range: Key::from_i128(35)..Key::from_i128(40),
-                lsn_range: Lsn(35)..Lsn(40),
-                is_delta: false,
-            },
-        ];
-
-        let layer_map = create_layer_map(layers.clone());
-        for start in 0..60 {
-            for end in (start + 1)..60 {
-                let range = Key::from_i128(start)..Key::from_i128(end);
-                let result = layer_map.range_search(range.clone(), Lsn(100)).unwrap();
-                let expected = brute_force_range_search(&layer_map, range, Lsn(100));
-
-                assert_range_search_result_eq(result, expected);
-            }
-        }
-    }
-}

pageserver/src/tenant/layer_map/layer_coverage.rs

@@ -129,42 +129,6 @@ impl<Value: Clone> LayerCoverage<Value> {
             .map(|(k, v)| (*k, v.as_ref().map(|x| x.1.clone())))
     }
 
-    /// Returns an iterator which includes all coverage changes for layers that intersect
-    /// with the provided range.
-    pub fn range_overlaps(
-        &self,
-        key_range: &Range<i128>,
-    ) -> impl Iterator<Item = (i128, Option<Value>)> + '_
-    where
-        Value: Eq,
-    {
-        let first_change = self.query(key_range.start);
-        match first_change {
-            Some(change) => {
-                // If the start of the range is covered, we have to deal with two cases:
-                // 1. Start of the range is aligned with the start of a layer.
-                // In this case the return of `self.range` will contain the layer which aligns with the start of the key range.
-                // We advance said iterator to avoid duplicating the first change.
-                // 2. Start of the range is not aligned with the start of a layer.
-                let range = key_range.start..key_range.end;
-                let mut range_coverage = self.range(range).peekable();
-                if range_coverage
-                    .peek()
-                    .is_some_and(|c| c.1.as_ref() == Some(&change))
-                {
-                    range_coverage.next();
-                }
-                itertools::Either::Left(
-                    std::iter::once((key_range.start, Some(change))).chain(range_coverage),
-                )
-            }
-            None => {
-                let range = key_range.start..key_range.end;
-                let coverage = self.range(range);
-                itertools::Either::Right(coverage)
-            }
-        }
-    }
     /// O(1) clone
     pub fn clone(&self) -> Self {
         Self {

pageserver/src/tenant/mgr.rs

@@ -7,7 +7,6 @@ use pageserver_api::models::ShardParameters;
 use pageserver_api::shard::{ShardCount, ShardIdentity, ShardNumber, TenantShardId};
 use rand::{distributions::Alphanumeric, Rng};
 use std::borrow::Cow;
-use std::cmp::Ordering;
 use std::collections::{BTreeMap, HashMap};
 use std::ops::Deref;
 use std::sync::Arc;
@@ -33,8 +32,7 @@ use crate::deletion_queue::DeletionQueueClient;
 use crate::metrics::{TENANT, TENANT_MANAGER as METRICS};
 use crate::task_mgr::{self, TaskKind};
 use crate::tenant::config::{
-    AttachedLocationConfig, AttachmentMode, LocationConf, LocationMode, SecondaryLocationConfig,
-    TenantConfOpt,
+    AttachedLocationConfig, AttachmentMode, LocationConf, LocationMode, TenantConfOpt,
 };
 use crate::tenant::delete::DeleteTenantFlow;
 use crate::tenant::span::debug_assert_current_span_has_tenant_id;
@@ -468,26 +466,6 @@ pub async fn init_tenant_mgr(
             // We have a generation map: treat it as the authority for whether
             // this tenant is really attached.
             if let Some(gen) = generations.get(&tenant_shard_id) {
-                if let LocationMode::Attached(attached) = &location_conf.mode {
-                    if attached.generation > *gen {
-                        tracing::error!(tenant_id=%tenant_shard_id.tenant_id, shard_id=%tenant_shard_id.shard_slug(),
-                            "Control plane gave decreasing generation ({gen:?}) in re-attach response for tenant that was attached in generation {:?}, demoting to secondary",
-                            attached.generation
-                        );
-
-                        // We cannot safely attach this tenant given a bogus generation number, but let's avoid throwing away
-                        // local disk content: demote to secondary rather than detaching.
-                        tenants.insert(
-                            tenant_shard_id,
-                            TenantSlot::Secondary(SecondaryTenant::new(
-                                tenant_shard_id,
-                                location_conf.shard,
-                                location_conf.tenant_conf,
-                                &SecondaryLocationConfig { warm: false },
-                            )),
-                        );
-                    }
-                }
                 *gen
             } else {
                 match &location_conf.mode {
@@ -743,7 +721,7 @@ async fn shutdown_all_tenants0(tenants: &std::sync::RwLock<TenantsMap>) {
         tokio::select! {
             Some(joined) = join_set.join_next() => {
                 match joined {
-                    Ok(()) => {},
+                    Ok(()) => {}
                     Err(join_error) if join_error.is_cancelled() => {
                         unreachable!("we are not cancelling any of the tasks");
                     }
@@ -904,7 +882,7 @@ impl TenantManager {
         tenant_shard_id: TenantShardId,
         new_location_config: LocationConf,
         flush: Option<Duration>,
-        mut spawn_mode: SpawnMode,
+        spawn_mode: SpawnMode,
         ctx: &RequestContext,
     ) -> Result<Option<Arc<Tenant>>, UpsertLocationError> {
         debug_assert_current_span_has_tenant_id();
@@ -924,29 +902,19 @@ impl TenantManager {
                 tenant_map_peek_slot(&locked, &tenant_shard_id, TenantSlotPeekMode::Write)?;
             match (&new_location_config.mode, peek_slot) {
                 (LocationMode::Attached(attach_conf), Some(TenantSlot::Attached(tenant))) => {
-                    match attach_conf.generation.cmp(&tenant.generation) {
-                        Ordering::Equal => {
-                            // A transition from Attached to Attached in the same generation, we may
-                            // take our fast path and just provide the updated configuration
-                            // to the tenant.
-                            tenant.set_new_location_config(
-                                AttachedTenantConf::try_from(new_location_config.clone())
-                                    .map_err(UpsertLocationError::BadRequest)?,
-                            );
+                    if attach_conf.generation == tenant.generation {
+                        // A transition from Attached to Attached in the same generation, we may
+                        // take our fast path and just provide the updated configuration
+                        // to the tenant.
+                        tenant.set_new_location_config(
+                            AttachedTenantConf::try_from(new_location_config.clone())
+                                .map_err(UpsertLocationError::BadRequest)?,
+                        );
 
-                            Some(FastPathModified::Attached(tenant.clone()))
-                        }
-                        Ordering::Less => {
-                            return Err(UpsertLocationError::BadRequest(anyhow::anyhow!(
-                                "Generation {:?} is less than existing {:?}",
-                                attach_conf.generation,
-                                tenant.generation
-                            )));
-                        }
-                        Ordering::Greater => {
-                            // Generation advanced, fall through to general case of replacing `Tenant` object
-                            None
-                        }
+                        Some(FastPathModified::Attached(tenant.clone()))
+                    } else {
+                        // Different generations, fall through to general case
+                        None
                     }
                 }
                 (
@@ -1051,12 +1019,6 @@ impl TenantManager {
                     }
                 }
                 slot_guard.drop_old_value().expect("We just shut it down");
-
-                // Edge case: if we were called with SpawnMode::Create, but a Tenant already existed, then
-                // the caller thinks they're creating but the tenant already existed.  We must switch to
-                // Normal mode so that when starting this Tenant we properly probe remote storage for timelines,
-                // rather than assuming it to be empty.
-                spawn_mode = SpawnMode::Normal;
             }
             Some(TenantSlot::Secondary(state)) => {
                 info!("Shutting down secondary tenant");
@@ -1140,46 +1102,14 @@ impl TenantManager {
             None
         };
 
-        match slot_guard.upsert(new_slot) {
-            Err(TenantSlotUpsertError::InternalError(e)) => {
-                Err(UpsertLocationError::Other(anyhow::anyhow!(e)))
+        slot_guard.upsert(new_slot).map_err(|e| match e {
+            TenantSlotUpsertError::InternalError(e) => {
+                UpsertLocationError::Other(anyhow::anyhow!(e))
             }
-            Err(TenantSlotUpsertError::MapState(e)) => Err(UpsertLocationError::Unavailable(e)),
-            Err(TenantSlotUpsertError::ShuttingDown((new_slot, _completion))) => {
-                // If we just called tenant_spawn() on a new tenant, and can't insert it into our map, then
-                // we must not leak it: this would violate the invariant that after shutdown_all_tenants, all tenants
-                // are shutdown.
-                //
-                // We must shut it down inline here.
-                match new_slot {
-                    TenantSlot::InProgress(_) => {
-                        // Unreachable because we never insert an InProgress
-                        unreachable!()
-                    }
-                    TenantSlot::Attached(tenant) => {
-                        let (_guard, progress) = utils::completion::channel();
-                        info!("Shutting down just-spawned tenant, because tenant manager is shut down");
-                        match tenant.shutdown(progress, false).await {
-                            Ok(()) => {
-                                info!("Finished shutting down just-spawned tenant");
-                            }
-                            Err(barrier) => {
-                                info!("Shutdown already in progress, waiting for it to complete");
-                                barrier.wait().await;
-                            }
-                        }
-                    }
-                    TenantSlot::Secondary(secondary_tenant) => {
-                        secondary_tenant.shutdown().await;
-                    }
-                }
+            TenantSlotUpsertError::MapState(e) => UpsertLocationError::Unavailable(e),
+        })?;
 
-                Err(UpsertLocationError::Unavailable(
-                    TenantMapError::ShuttingDown,
-                ))
-            }
-            Ok(()) => Ok(attached_tenant),
-        }
+        Ok(attached_tenant)
     }
 
     /// Resetting a tenant is equivalent to detaching it, then attaching it again with the same
@@ -1311,7 +1241,6 @@ impl TenantManager {
         tenant_shard_id: TenantShardId,
         activation_timeout: Duration,
     ) -> Result<(), DeleteTenantError> {
-        super::span::debug_assert_current_span_has_tenant_id();
         // We acquire a SlotGuard during this function to protect against concurrent
         // changes while the ::prepare phase of DeleteTenantFlow executes, but then
         // have to return the Tenant to the map while the background deletion runs.
@@ -1799,31 +1728,14 @@ pub(crate) enum TenantSlotError {
 
 /// Superset of TenantMapError: issues that can occur when using a SlotGuard
 /// to insert a new value.
-#[derive(thiserror::Error)]
-pub(crate) enum TenantSlotUpsertError {
+#[derive(Debug, thiserror::Error)]
+pub enum TenantSlotUpsertError {
     /// An error where the slot is in an unexpected state, indicating a code bug
     #[error("Internal error updating Tenant")]
     InternalError(Cow<'static, str>),
 
     #[error(transparent)]
-    MapState(TenantMapError),
-
-    // If we encounter TenantManager shutdown during upsert, we must carry the Completion
-    // from the SlotGuard, so that the caller can hold it while they clean up: otherwise
-    // TenantManager shutdown might race ahead before we're done cleaning up any Tenant that
-    // was protected by the SlotGuard.
-    #[error("Shutting down")]
-    ShuttingDown((TenantSlot, utils::completion::Completion)),
-}
-
-impl std::fmt::Debug for TenantSlotUpsertError {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        match self {
-            Self::InternalError(reason) => write!(f, "Internal Error {reason}"),
-            Self::MapState(map_error) => write!(f, "Tenant map state: {map_error:?}"),
-            Self::ShuttingDown(_completion) => write!(f, "Tenant map shutting down"),
-        }
-    }
+    MapState(#[from] TenantMapError),
 }
 
 #[derive(Debug, thiserror::Error)]
@@ -1872,7 +1784,7 @@ pub struct SlotGuard {
 
     /// [`TenantSlot::InProgress`] carries the corresponding Barrier: it will
     /// release any waiters as soon as this SlotGuard is dropped.
-    completion: utils::completion::Completion,
+    _completion: utils::completion::Completion,
 }
 
 impl SlotGuard {
@@ -1885,7 +1797,7 @@ impl SlotGuard {
             tenant_shard_id,
             old_value,
             upserted: false,
-            completion,
+            _completion: completion,
         }
     }
 
@@ -1918,16 +1830,9 @@ impl SlotGuard {
             }
 
             let m = match &mut *locked {
-                TenantsMap::Initializing => {
-                    return Err(TenantSlotUpsertError::MapState(
-                        TenantMapError::StillInitializing,
-                    ))
-                }
+                TenantsMap::Initializing => return Err(TenantMapError::StillInitializing.into()),
                 TenantsMap::ShuttingDown(_) => {
-                    return Err(TenantSlotUpsertError::ShuttingDown((
-                        new_value,
-                        self.completion.clone(),
-                    )));
+                    return Err(TenantMapError::ShuttingDown.into());
                 }
                 TenantsMap::Open(m) => m,
             };
@@ -1975,9 +1880,7 @@ impl SlotGuard {
                 Err(TenantSlotUpsertError::InternalError(_)) => {
                     // We already logged the error, nothing else we can do.
                 }
-                Err(
-                    TenantSlotUpsertError::MapState(_) | TenantSlotUpsertError::ShuttingDown(_),
-                ) => {
+                Err(TenantSlotUpsertError::MapState(_)) => {
                     // If the map is shutting down, we need not replace anything
                 }
                 Ok(()) => {}
@@ -2075,22 +1978,18 @@ fn tenant_map_peek_slot<'a>(
     tenant_shard_id: &TenantShardId,
     mode: TenantSlotPeekMode,
 ) -> Result<Option<&'a TenantSlot>, TenantMapError> {
-    match tenants.deref() {
-        TenantsMap::Initializing => Err(TenantMapError::StillInitializing),
+    let m = match tenants.deref() {
+        TenantsMap::Initializing => return Err(TenantMapError::StillInitializing),
         TenantsMap::ShuttingDown(m) => match mode {
-            TenantSlotPeekMode::Read => Ok(Some(
-                // When reading in ShuttingDown state, we must translate None results
-                // into a ShuttingDown error, because absence of a tenant shard ID in the map
-                // isn't a reliable indicator of the tenant being gone: it might have been
-                // InProgress when shutdown started, and cleaned up from that state such
-                // that it's now no longer in the map.  Callers will have to wait until
-                // we next start up to get a proper answer.  This avoids incorrect 404 API responses.
-                m.get(tenant_shard_id).ok_or(TenantMapError::ShuttingDown)?,
-            )),
-            TenantSlotPeekMode::Write => Err(TenantMapError::ShuttingDown),
+            TenantSlotPeekMode::Read => m,
+            TenantSlotPeekMode::Write => {
+                return Err(TenantMapError::ShuttingDown);
+            }
         },
-        TenantsMap::Open(m) => Ok(m.get(tenant_shard_id)),
-    }
+        TenantsMap::Open(m) => m,
+    };
+
+    Ok(m.get(tenant_shard_id))
 }
 
 enum TenantSlotAcquireMode {

pageserver/src/tenant/remote_timeline_client.rs

@@ -257,8 +257,6 @@ pub(crate) const FAILED_UPLOAD_WARN_THRESHOLD: u32 = 3;
 
 pub(crate) const INITDB_PATH: &str = "initdb.tar.zst";
 
-pub(crate) const INITDB_PRESERVED_PATH: &str = "initdb-preserved.tar.zst";
-
 /// Default buffer size when interfacing with [`tokio::fs::File`].
 pub(crate) const BUFFER_SIZE: usize = 32 * 1024;
 
@@ -1068,28 +1066,6 @@ impl RemoteTimelineClient {
         Ok(())
     }
 
-    pub(crate) async fn preserve_initdb_archive(
-        self: &Arc<Self>,
-        tenant_id: &TenantId,
-        timeline_id: &TimelineId,
-        cancel: &CancellationToken,
-    ) -> anyhow::Result<()> {
-        backoff::retry(
-            || async {
-                upload::preserve_initdb_archive(&self.storage_impl, tenant_id, timeline_id, cancel)
-                    .await
-            },
-            |_e| false,
-            FAILED_DOWNLOAD_WARN_THRESHOLD,
-            FAILED_REMOTE_OP_RETRIES,
-            "preserve_initdb_tar_zst",
-            backoff::Cancel::new(cancel.clone(), || anyhow::anyhow!("Cancelled!")),
-        )
-        .await
-        .context("backing up initdb archive")?;
-        Ok(())
-    }
-
     /// Prerequisites: UploadQueue should be in stopped state and deleted_at should be successfuly set.
     /// The function deletes layer files one by one, then lists the prefix to see if we leaked something
     /// deletes leaked files if any and proceeds with deletion of index file at the end.
@@ -1125,14 +1101,6 @@ impl RemoteTimelineClient {
         let layer_deletion_count = layers.len();
         self.deletion_queue_client.push_immediate(layers).await?;
 
-        // Delete the initdb.tar.zst, which is not always present, but deletion attempts of
-        // inexistant objects are not considered errors.
-        let initdb_path =
-            remote_initdb_archive_path(&self.tenant_shard_id.tenant_id, &self.timeline_id);
-        self.deletion_queue_client
-            .push_immediate(vec![initdb_path])
-            .await?;
-
         // Do not delete index part yet, it is needed for possible retry. If we remove it first
         // and retry will arrive to different pageserver there wont be any traces of it on remote storage
         let timeline_storage_path = remote_timeline_path(&self.tenant_shard_id, &self.timeline_id);
@@ -1180,8 +1148,10 @@ impl RemoteTimelineClient {
                 if p == &latest_index {
                     return false;
                 }
-                if p.object_name() == Some(INITDB_PRESERVED_PATH) {
-                    return false;
+                if let Some(name) = p.object_name() {
+                    if name == INITDB_PATH {
+                        return false;
+                    }
                 }
                 true
             })
@@ -1754,16 +1724,6 @@ pub fn remote_initdb_archive_path(tenant_id: &TenantId, timeline_id: &TimelineId
     .expect("Failed to construct path")
 }
 
-pub fn remote_initdb_preserved_archive_path(
-    tenant_id: &TenantId,
-    timeline_id: &TimelineId,
-) -> RemotePath {
-    RemotePath::from_string(&format!(
-        "tenants/{tenant_id}/{TIMELINES_SEGMENT_NAME}/{timeline_id}/{INITDB_PRESERVED_PATH}"
-    ))
-    .expect("Failed to construct path")
-}
-
 pub fn remote_index_path(
     tenant_shard_id: &TenantShardId,
     timeline_id: &TimelineId,

pageserver/src/tenant/remote_timeline_client/download.rs

@@ -32,8 +32,7 @@ use utils::id::TimelineId;
 use super::index::{IndexPart, LayerFileMetadata};
 use super::{
     parse_remote_index_path, remote_index_path, remote_initdb_archive_path,
-    remote_initdb_preserved_archive_path, FAILED_DOWNLOAD_WARN_THRESHOLD, FAILED_REMOTE_OP_RETRIES,
-    INITDB_PATH,
+    FAILED_DOWNLOAD_WARN_THRESHOLD, FAILED_REMOTE_OP_RETRIES, INITDB_PATH,
 };
 
 ///
@@ -431,9 +430,6 @@ pub(crate) async fn download_initdb_tar_zst(
 
     let remote_path = remote_initdb_archive_path(&tenant_shard_id.tenant_id, timeline_id);
 
-    let remote_preserved_path =
-        remote_initdb_preserved_archive_path(&tenant_shard_id.tenant_id, timeline_id);
-
     let timeline_path = conf.timelines_path(tenant_shard_id);
 
     if !timeline_path.exists() {
@@ -460,16 +456,8 @@ pub(crate) async fn download_initdb_tar_zst(
                 .with_context(|| format!("tempfile creation {temp_path}"))
                 .map_err(DownloadError::Other)?;
 
-            let download = match download_cancellable(&cancel_inner, storage.download(&remote_path))
-                .await
-            {
-                Ok(dl) => dl,
-                Err(DownloadError::NotFound) => {
-                    download_cancellable(&cancel_inner, storage.download(&remote_preserved_path))
-                        .await?
-                }
-                Err(other) => Err(other)?,
-            };
+            let download =
+                download_cancellable(&cancel_inner, storage.download(&remote_path)).await?;
             let mut download = tokio_util::io::StreamReader::new(download.download_stream);
             let mut writer = tokio::io::BufWriter::with_capacity(8 * 1024, file);
 

pageserver/src/tenant/remote_timeline_client/upload.rs

@@ -13,8 +13,8 @@ use super::Generation;
 use crate::{
     config::PageServerConf,
     tenant::remote_timeline_client::{
-        index::IndexPart, remote_index_path, remote_initdb_archive_path,
-        remote_initdb_preserved_archive_path, remote_path, upload_cancellable,
+        index::IndexPart, remote_index_path, remote_initdb_archive_path, remote_path,
+        upload_cancellable,
     },
 };
 use remote_storage::GenericRemoteStorage;
@@ -144,16 +144,3 @@ pub(crate) async fn upload_initdb_dir(
     .await
     .with_context(|| format!("upload initdb dir for '{tenant_id} / {timeline_id}'"))
 }
-
-pub(crate) async fn preserve_initdb_archive(
-    storage: &GenericRemoteStorage,
-    tenant_id: &TenantId,
-    timeline_id: &TimelineId,
-    cancel: &CancellationToken,
-) -> anyhow::Result<()> {
-    let source_path = remote_initdb_archive_path(tenant_id, timeline_id);
-    let dest_path = remote_initdb_preserved_archive_path(tenant_id, timeline_id);
-    upload_cancellable(cancel, storage.copy_object(&source_path, &dest_path))
-        .await
-        .with_context(|| format!("backing up initdb archive for '{tenant_id} / {timeline_id}'"))
-}

pageserver/src/tenant/secondary.rs

@@ -112,7 +112,7 @@ impl SecondaryTenant {
             // on shutdown we walk the tenants and fire their
             // individual cancellations?
             cancel: CancellationToken::new(),
-            gate: Gate::default(),
+            gate: Gate::new(format!("SecondaryTenant {tenant_shard_id}")),
 
             shard_identity,
             tenant_conf: std::sync::Mutex::new(tenant_conf),

pageserver/src/tenant/storage_layer/delta_layer.rs

@@ -36,7 +36,7 @@ use crate::tenant::block_io::{BlockBuf, BlockCursor, BlockLease, BlockReader, Fi
 use crate::tenant::disk_btree::{DiskBtreeBuilder, DiskBtreeReader, VisitDirection};
 use crate::tenant::storage_layer::{Layer, ValueReconstructResult, ValueReconstructState};
 use crate::tenant::Timeline;
-use crate::virtual_file::{self, VirtualFile};
+use crate::virtual_file::VirtualFile;
 use crate::{walrecord, TEMP_FILE_SUFFIX};
 use crate::{DELTA_FILE_MAGIC, STORAGE_FORMAT_VERSION};
 use anyhow::{bail, ensure, Context, Result};
@@ -649,7 +649,7 @@ impl DeltaLayer {
     {
         let file = VirtualFile::open_with_options(
             path,
-            virtual_file::OpenOptions::new().read(true).write(true),
+            &*std::fs::OpenOptions::new().read(true).write(true),
         )
         .await
         .with_context(|| format!("Failed to open file '{}'", path))?;
@@ -884,7 +884,7 @@ impl DeltaLayerInner {
 
         let keys = self.load_keys(ctx).await?;
 
-        async fn dump_blob(val: &ValueRef<'_>, ctx: &RequestContext) -> anyhow::Result<String> {
+        async fn dump_blob(val: ValueRef<'_>, ctx: &RequestContext) -> anyhow::Result<String> {
             let buf = val.reader.read_blob(val.blob_ref.pos(), ctx).await?;
             let val = Value::des(&buf)?;
             let desc = match val {
@@ -906,32 +906,13 @@ impl DeltaLayerInner {
 
         for entry in keys {
             let DeltaEntry { key, lsn, val, .. } = entry;
-            let desc = match dump_blob(&val, ctx).await {
+            let desc = match dump_blob(val, ctx).await {
                 Ok(desc) => desc,
                 Err(err) => {
                     format!("ERROR: {err}")
                 }
             };
             println!("  key {key} at {lsn}: {desc}");
-
-            // Print more details about CHECKPOINT records. Would be nice to print details
-            // of many other record types too, but these are particularly interesting, as
-            // have a lot of special processing for them in walingest.rs.
-            use pageserver_api::key::CHECKPOINT_KEY;
-            use postgres_ffi::CheckPoint;
-            if key == CHECKPOINT_KEY {
-                let buf = val.reader.read_blob(val.blob_ref.pos(), ctx).await?;
-                let val = Value::des(&buf)?;
-                match val {
-                    Value::Image(img) => {
-                        let checkpoint = CheckPoint::decode(&img)?;
-                        println!("   CHECKPOINT: {:?}", checkpoint);
-                    }
-                    Value::WalRecord(_rec) => {
-                        println!("   unexpected walrecord value for checkpoint key");
-                    }
-                }
-            }
         }
 
         Ok(())

pageserver/src/tenant/storage_layer/image_layer.rs

@@ -34,7 +34,7 @@ use crate::tenant::storage_layer::{
     LayerAccessStats, ValueReconstructResult, ValueReconstructState,
 };
 use crate::tenant::Timeline;
-use crate::virtual_file::{self, VirtualFile};
+use crate::virtual_file::VirtualFile;
 use crate::{IMAGE_FILE_MAGIC, STORAGE_FORMAT_VERSION, TEMP_FILE_SUFFIX};
 use anyhow::{bail, ensure, Context, Result};
 use bytes::Bytes;
@@ -327,7 +327,7 @@ impl ImageLayer {
     {
         let file = VirtualFile::open_with_options(
             path,
-            virtual_file::OpenOptions::new().read(true).write(true),
+            &*std::fs::OpenOptions::new().read(true).write(true),
         )
         .await
         .with_context(|| format!("Failed to open file '{}'", path))?;
@@ -492,15 +492,11 @@ impl ImageLayerWriterInner {
             },
         );
         info!("new image layer {path}");
-        let mut file = {
-            VirtualFile::open_with_options(
-                &path,
-                virtual_file::OpenOptions::new()
-                    .write(true)
-                    .create_new(true),
-            )
-            .await?
-        };
+        let mut file = VirtualFile::open_with_options(
+            &path,
+            std::fs::OpenOptions::new().write(true).create_new(true),
+        )
+        .await?;
         // make room for the header block
         file.seek(SeekFrom::Start(PAGE_SZ as u64)).await?;
         let blob_writer = BlobWriter::new(file, PAGE_SZ as u64);

pageserver/src/tenant/storage_layer/layer_desc.rs

@@ -55,13 +55,13 @@ impl PersistentLayerDesc {
     }
 
     #[cfg(test)]
-    pub fn new_test(key_range: Range<Key>, lsn_range: Range<Lsn>, is_delta: bool) -> Self {
+    pub fn new_test(key_range: Range<Key>) -> Self {
         Self {
             tenant_shard_id: TenantShardId::unsharded(TenantId::generate()),
             timeline_id: TimelineId::generate(),
             key_range,
-            lsn_range,
-            is_delta,
+            lsn_range: Lsn(0)..Lsn(1),
+            is_delta: false,
             file_size: 0,
         }
     }

pageserver/src/tenant/tasks.rs

@@ -9,7 +9,6 @@ use crate::context::{DownloadBehavior, RequestContext};
 use crate::metrics::TENANT_TASK_EVENTS;
 use crate::task_mgr;
 use crate::task_mgr::{TaskKind, BACKGROUND_RUNTIME};
-use crate::tenant::timeline::CompactionError;
 use crate::tenant::{Tenant, TenantState};
 use tokio_util::sync::CancellationToken;
 use tracing::*;
@@ -182,11 +181,8 @@ async fn compaction_loop(tenant: Arc<Tenant>, cancel: CancellationToken) {
                     );
                     error_run_count += 1;
                     let wait_duration = Duration::from_secs_f64(wait_duration);
-                    log_compaction_error(
-                        &e,
-                        error_run_count,
-                        &wait_duration,
-                        cancel.is_cancelled(),
+                    error!(
+                        "Compaction failed {error_run_count} times, retrying in {wait_duration:?}: {e:?}",
                     );
                     wait_duration
                 } else {
@@ -214,58 +210,6 @@ async fn compaction_loop(tenant: Arc<Tenant>, cancel: CancellationToken) {
     TENANT_TASK_EVENTS.with_label_values(&["stop"]).inc();
 }
 
-fn log_compaction_error(
-    e: &CompactionError,
-    error_run_count: u32,
-    sleep_duration: &std::time::Duration,
-    task_cancelled: bool,
-) {
-    use crate::tenant::upload_queue::NotInitialized;
-    use crate::tenant::PageReconstructError;
-    use CompactionError::*;
-
-    enum LooksLike {
-        Info,
-        Error,
-    }
-
-    let decision = match e {
-        ShuttingDown => None,
-        _ if task_cancelled => Some(LooksLike::Info),
-        Other(e) => {
-            let root_cause = e.root_cause();
-
-            let is_stopping = {
-                let upload_queue = root_cause
-                    .downcast_ref::<NotInitialized>()
-                    .is_some_and(|e| e.is_stopping());
-
-                let timeline = root_cause
-                    .downcast_ref::<PageReconstructError>()
-                    .is_some_and(|e| e.is_stopping());
-
-                upload_queue || timeline
-            };
-
-            if is_stopping {
-                Some(LooksLike::Info)
-            } else {
-                Some(LooksLike::Error)
-            }
-        }
-    };
-
-    match decision {
-        Some(LooksLike::Info) => info!(
-            "Compaction failed {error_run_count} times, retrying in {sleep_duration:?}: {e:#}",
-        ),
-        Some(LooksLike::Error) => error!(
-            "Compaction failed {error_run_count} times, retrying in {sleep_duration:?}: {e:?}",
-        ),
-        None => {}
-    }
-}
-
 ///
 /// GC task's main loop
 ///

pageserver/src/tenant/timeline.rs

@@ -14,7 +14,6 @@ use enumset::EnumSet;
 use fail::fail_point;
 use itertools::Itertools;
 use pageserver_api::{
-    keyspace::{key_range_size, KeySpaceAccum},
     models::{
         DownloadRemoteLayersTaskInfo, DownloadRemoteLayersTaskSpawnRequest, EvictionPolicy,
         LayerMapInfo, TimelineState,
@@ -33,7 +32,7 @@ use tokio_util::sync::CancellationToken;
 use tracing::*;
 use utils::sync::gate::Gate;
 
-use std::collections::{BTreeMap, BinaryHeap, HashMap, HashSet};
+use std::collections::{BinaryHeap, HashMap, HashSet};
 use std::ops::{Deref, Range};
 use std::pin::pin;
 use std::sync::atomic::Ordering as AtomicOrdering;
@@ -74,8 +73,8 @@ use crate::metrics::{
     TimelineMetrics, MATERIALIZED_PAGE_CACHE_HIT, MATERIALIZED_PAGE_CACHE_HIT_DIRECT,
 };
 use crate::pgdatadir_mapping::CalculateLogicalSizeError;
+use crate::pgdatadir_mapping::{is_inherited_key, is_rel_fsm_block_key, is_rel_vm_block_key};
 use crate::tenant::config::TenantConfOpt;
-use pageserver_api::key::{is_inherited_key, is_rel_fsm_block_key, is_rel_vm_block_key};
 use pageserver_api::reltag::RelTag;
 use pageserver_api::shard::ShardIndex;
 
@@ -392,7 +391,8 @@ pub(crate) enum PageReconstructError {
     #[error("Ancestor LSN wait error: {0}")]
     AncestorLsnTimeout(#[from] WaitLsnError),
 
-    #[error("timeline shutting down")]
+    /// The operation was cancelled
+    #[error("Cancelled")]
     Cancelled,
 
     /// The ancestor of this is being stopped
@@ -404,34 +404,6 @@ pub(crate) enum PageReconstructError {
     WalRedo(anyhow::Error),
 }
 
-impl PageReconstructError {
-    /// Returns true if this error indicates a tenant/timeline shutdown alike situation
-    pub(crate) fn is_stopping(&self) -> bool {
-        use PageReconstructError::*;
-        match self {
-            Other(_) => false,
-            AncestorLsnTimeout(_) => false,
-            Cancelled | AncestorStopping(_) => true,
-            WalRedo(_) => false,
-        }
-    }
-}
-
-#[derive(thiserror::Error, Debug)]
-enum CreateImageLayersError {
-    #[error("timeline shutting down")]
-    Cancelled,
-
-    #[error(transparent)]
-    GetVectoredError(GetVectoredError),
-
-    #[error(transparent)]
-    PageReconstructError(PageReconstructError),
-
-    #[error(transparent)]
-    Other(#[from] anyhow::Error),
-}
-
 #[derive(thiserror::Error, Debug)]
 enum FlushLayerError {
     /// Timeline cancellation token was cancelled
@@ -439,34 +411,7 @@ enum FlushLayerError {
     Cancelled,
 
     #[error(transparent)]
-    CreateImageLayersError(CreateImageLayersError),
-
-    #[error(transparent)]
-    Other(#[from] anyhow::Error),
-}
-
-#[derive(thiserror::Error, Debug)]
-pub(crate) enum GetVectoredError {
-    #[error("timeline shutting down")]
-    Cancelled,
-
-    #[error("Requested too many keys: {0} > {}", Timeline::MAX_GET_VECTORED_KEYS)]
-    Oversized(u64),
-
-    #[error("Requested at invalid LSN: {0}")]
-    InvalidLsn(Lsn),
-}
-
-#[derive(thiserror::Error, Debug)]
-pub(crate) enum GetReadyAncestorError {
-    #[error("ancestor timeline {0} is being stopped")]
-    AncestorStopping(TimelineId),
-
-    #[error("Ancestor LSN wait error: {0}")]
-    AncestorLsnTimeout(#[from] WaitLsnError),
-
-    #[error("Cancelled")]
-    Cancelled,
+    PageReconstructError(#[from] PageReconstructError),
 
     #[error(transparent)]
     Other(#[from] anyhow::Error),
@@ -511,57 +456,6 @@ pub(crate) enum WaitLsnError {
     Timeout(String),
 }
 
-// The impls below achieve cancellation mapping for errors.
-// Perhaps there's a way of achieving this with less cruft.
-
-impl From<CreateImageLayersError> for CompactionError {
-    fn from(e: CreateImageLayersError) -> Self {
-        match e {
-            CreateImageLayersError::Cancelled => CompactionError::ShuttingDown,
-            _ => CompactionError::Other(e.into()),
-        }
-    }
-}
-
-impl From<CreateImageLayersError> for FlushLayerError {
-    fn from(e: CreateImageLayersError) -> Self {
-        match e {
-            CreateImageLayersError::Cancelled => FlushLayerError::Cancelled,
-            any => FlushLayerError::CreateImageLayersError(any),
-        }
-    }
-}
-
-impl From<PageReconstructError> for CreateImageLayersError {
-    fn from(e: PageReconstructError) -> Self {
-        match e {
-            PageReconstructError::Cancelled => CreateImageLayersError::Cancelled,
-            _ => CreateImageLayersError::PageReconstructError(e),
-        }
-    }
-}
-
-impl From<GetVectoredError> for CreateImageLayersError {
-    fn from(e: GetVectoredError) -> Self {
-        match e {
-            GetVectoredError::Cancelled => CreateImageLayersError::Cancelled,
-            _ => CreateImageLayersError::GetVectoredError(e),
-        }
-    }
-}
-
-impl From<GetReadyAncestorError> for PageReconstructError {
-    fn from(e: GetReadyAncestorError) -> Self {
-        use GetReadyAncestorError::*;
-        match e {
-            AncestorStopping(tid) => PageReconstructError::AncestorStopping(tid),
-            AncestorLsnTimeout(wait_err) => PageReconstructError::AncestorLsnTimeout(wait_err),
-            Cancelled => PageReconstructError::Cancelled,
-            Other(other) => PageReconstructError::Other(other),
-        }
-    }
-}
-
 /// Public interface functions
 impl Timeline {
     /// Get the LSN where this branch was created
@@ -681,57 +575,6 @@ impl Timeline {
         res
     }
 
-    pub(crate) const MAX_GET_VECTORED_KEYS: u64 = 32;
-
-    /// Look up multiple page versions at a given LSN
-    ///
-    /// This naive implementation will be replaced with a more efficient one
-    /// which actually vectorizes the read path.
-    pub(crate) async fn get_vectored(
-        &self,
-        key_ranges: &[Range<Key>],
-        lsn: Lsn,
-        ctx: &RequestContext,
-    ) -> Result<BTreeMap<Key, Result<Bytes, PageReconstructError>>, GetVectoredError> {
-        if !lsn.is_valid() {
-            return Err(GetVectoredError::InvalidLsn(lsn));
-        }
-
-        let key_count = key_ranges
-            .iter()
-            .map(|range| key_range_size(range) as u64)
-            .sum();
-        if key_count > Timeline::MAX_GET_VECTORED_KEYS {
-            return Err(GetVectoredError::Oversized(key_count));
-        }
-
-        let _timer = crate::metrics::GET_VECTORED_LATENCY
-            .for_task_kind(ctx.task_kind())
-            .map(|t| t.start_timer());
-
-        let mut values = BTreeMap::new();
-        for range in key_ranges {
-            let mut key = range.start;
-            while key != range.end {
-                assert!(!self.shard_identity.is_key_disposable(&key));
-
-                let block = self.get(key, lsn, ctx).await;
-
-                if matches!(
-                    block,
-                    Err(PageReconstructError::Cancelled | PageReconstructError::AncestorStopping(_))
-                ) {
-                    return Err(GetVectoredError::Cancelled);
-                }
-
-                values.insert(key, block);
-                key = key.next();
-            }
-        }
-
-        Ok(values)
-    }
-
     /// Get last or prev record separately. Same as get_last_record_rlsn().last/prev.
     pub fn get_last_record_lsn(&self) -> Lsn {
         self.last_record_lsn.load().last
@@ -1087,6 +930,7 @@ impl Timeline {
     /// also to remote storage.  This method can easily take multiple seconds for a busy timeline.
     ///
     /// While we are flushing, we continue to accept read I/O.
+    #[instrument(skip_all, fields(timeline_id=%self.timeline_id))]
     pub(crate) async fn flush_and_shutdown(&self) {
         debug_assert_current_span_has_tenant_and_timeline_id();
 
@@ -1135,8 +979,6 @@ impl Timeline {
     /// Shut down immediately, without waiting for any open layers to flush to disk.  This is a subset of
     /// the graceful [`Timeline::flush_and_shutdown`] function.
     pub(crate) async fn shutdown(&self) {
-        span::debug_assert_current_span_has_tenant_and_timeline_id();
-
         // Signal any subscribers to our cancellation token to drop out
         tracing::debug!("Cancelling CancellationToken");
         self.cancel.cancel();
@@ -1315,13 +1157,6 @@ const REPARTITION_FREQ_IN_CHECKPOINT_DISTANCE: u64 = 10;
 
 // Private functions
 impl Timeline {
-    pub fn get_lazy_slru_download(&self) -> bool {
-        let tenant_conf = self.tenant_conf.read().unwrap().tenant_conf;
-        tenant_conf
-            .lazy_slru_download
-            .unwrap_or(self.conf.default_tenant_conf.lazy_slru_download)
-    }
-
     fn get_checkpoint_distance(&self) -> u64 {
         let tenant_conf = self.tenant_conf.read().unwrap().tenant_conf;
         tenant_conf
@@ -1530,7 +1365,7 @@ impl Timeline {
                 delete_progress: Arc::new(tokio::sync::Mutex::new(DeleteTimelineFlow::default())),
 
                 cancel,
-                gate: Gate::default(),
+                gate: Gate::new(format!("Timeline<{tenant_shard_id}/{timeline_id}>")),
 
                 compaction_lock: tokio::sync::Mutex::default(),
                 gc_lock: tokio::sync::Mutex::default(),
@@ -2427,8 +2262,60 @@ impl Timeline {
                     timeline.ancestor_lsn,
                     cont_lsn
                 );
+                let ancestor = match timeline.get_ancestor_timeline() {
+                    Ok(timeline) => timeline,
+                    Err(e) => return Err(PageReconstructError::from(e)),
+                };
 
-                timeline_owned = timeline.get_ready_ancestor_timeline(ctx).await?;
+                // It's possible that the ancestor timeline isn't active yet, or
+                // is active but hasn't yet caught up to the branch point. Wait
+                // for it.
+                //
+                // This cannot happen while the pageserver is running normally,
+                // because you cannot create a branch from a point that isn't
+                // present in the pageserver yet. However, we don't wait for the
+                // branch point to be uploaded to cloud storage before creating
+                // a branch. I.e., the branch LSN need not be remote consistent
+                // for the branching operation to succeed.
+                //
+                // Hence, if we try to load a tenant in such a state where
+                // 1. the existence of the branch was persisted (in IndexPart and/or locally)
+                // 2. but the ancestor state is behind branch_lsn because it was not yet persisted
+                // then we will need to wait for the ancestor timeline to
+                // re-stream WAL up to branch_lsn before we access it.
+                //
+                // How can a tenant get in such a state?
+                // - ungraceful pageserver process exit
+                // - detach+attach => this is a bug, https://github.com/neondatabase/neon/issues/4219
+                //
+                // NB: this could be avoided by requiring
+                //   branch_lsn >= remote_consistent_lsn
+                // during branch creation.
+                match ancestor.wait_to_become_active(ctx).await {
+                    Ok(()) => {}
+                    Err(TimelineState::Stopping) => {
+                        return Err(PageReconstructError::AncestorStopping(ancestor.timeline_id));
+                    }
+                    Err(state) => {
+                        return Err(PageReconstructError::Other(anyhow::anyhow!(
+                            "Timeline {} will not become active. Current state: {:?}",
+                            ancestor.timeline_id,
+                            &state,
+                        )));
+                    }
+                }
+                ancestor
+                    .wait_lsn(timeline.ancestor_lsn, ctx)
+                    .await
+                    .map_err(|e| match e {
+                        e @ WaitLsnError::Timeout(_) => PageReconstructError::AncestorLsnTimeout(e),
+                        WaitLsnError::Shutdown => PageReconstructError::Cancelled,
+                        e @ WaitLsnError::BadState => {
+                            PageReconstructError::Other(anyhow::anyhow!(e))
+                        }
+                    })?;
+
+                timeline_owned = ancestor;
                 timeline = &*timeline_owned;
                 prev_lsn = Lsn(u64::MAX);
                 continue 'outer;
@@ -2558,66 +2445,6 @@ impl Timeline {
         Some((lsn, img))
     }
 
-    async fn get_ready_ancestor_timeline(
-        &self,
-        ctx: &RequestContext,
-    ) -> Result<Arc<Timeline>, GetReadyAncestorError> {
-        let ancestor = match self.get_ancestor_timeline() {
-            Ok(timeline) => timeline,
-            Err(e) => return Err(GetReadyAncestorError::from(e)),
-        };
-
-        // It's possible that the ancestor timeline isn't active yet, or
-        // is active but hasn't yet caught up to the branch point. Wait
-        // for it.
-        //
-        // This cannot happen while the pageserver is running normally,
-        // because you cannot create a branch from a point that isn't
-        // present in the pageserver yet. However, we don't wait for the
-        // branch point to be uploaded to cloud storage before creating
-        // a branch. I.e., the branch LSN need not be remote consistent
-        // for the branching operation to succeed.
-        //
-        // Hence, if we try to load a tenant in such a state where
-        // 1. the existence of the branch was persisted (in IndexPart and/or locally)
-        // 2. but the ancestor state is behind branch_lsn because it was not yet persisted
-        // then we will need to wait for the ancestor timeline to
-        // re-stream WAL up to branch_lsn before we access it.
-        //
-        // How can a tenant get in such a state?
-        // - ungraceful pageserver process exit
-        // - detach+attach => this is a bug, https://github.com/neondatabase/neon/issues/4219
-        //
-        // NB: this could be avoided by requiring
-        //   branch_lsn >= remote_consistent_lsn
-        // during branch creation.
-        match ancestor.wait_to_become_active(ctx).await {
-            Ok(()) => {}
-            Err(TimelineState::Stopping) => {
-                return Err(GetReadyAncestorError::AncestorStopping(
-                    ancestor.timeline_id,
-                ));
-            }
-            Err(state) => {
-                return Err(GetReadyAncestorError::Other(anyhow::anyhow!(
-                    "Timeline {} will not become active. Current state: {:?}",
-                    ancestor.timeline_id,
-                    &state,
-                )));
-            }
-        }
-        ancestor
-            .wait_lsn(self.ancestor_lsn, ctx)
-            .await
-            .map_err(|e| match e {
-                e @ WaitLsnError::Timeout(_) => GetReadyAncestorError::AncestorLsnTimeout(e),
-                WaitLsnError::Shutdown => GetReadyAncestorError::Cancelled,
-                e @ WaitLsnError::BadState => GetReadyAncestorError::Other(anyhow::anyhow!(e)),
-            })?;
-
-        Ok(ancestor)
-    }
-
     fn get_ancestor_timeline(&self) -> anyhow::Result<Arc<Timeline>> {
         let ancestor = self.ancestor_timeline.as_ref().with_context(|| {
             format!(
@@ -2755,7 +2582,7 @@ impl Timeline {
                         return;
                     }
                     err @ Err(
-                        FlushLayerError::Other(_) | FlushLayerError::CreateImageLayersError(_),
+                        FlushLayerError::Other(_) | FlushLayerError::PageReconstructError(_),
                     ) => {
                         error!("could not flush frozen layer: {err:?}");
                         break err;
@@ -2828,12 +2655,12 @@ impl Timeline {
     }
 
     /// Flush one frozen in-memory layer to disk, as a new delta layer.
+    #[instrument(skip_all, fields(tenant_id=%self.tenant_shard_id.tenant_id, shard_id = %self.tenant_shard_id.shard_slug(), timeline_id=%self.timeline_id, layer=%frozen_layer))]
     async fn flush_frozen_layer(
         self: &Arc<Self>,
         frozen_layer: Arc<InMemoryLayer>,
         ctx: &RequestContext,
     ) -> Result<(), FlushLayerError> {
-        span::debug_assert_current_span_has_tenant_and_timeline_id();
         // As a special case, when we have just imported an image into the repository,
         // instead of writing out a L0 delta layer, we directly write out image layer
         // files instead. This is possible as long as *all* the data imported into the
@@ -3032,21 +2859,6 @@ impl Timeline {
         Ok(())
     }
 
-    pub(crate) async fn preserve_initdb_archive(&self) -> anyhow::Result<()> {
-        if let Some(remote_client) = &self.remote_client {
-            remote_client
-                .preserve_initdb_archive(
-                    &self.tenant_shard_id.tenant_id,
-                    &self.timeline_id,
-                    &self.cancel,
-                )
-                .await?;
-        } else {
-            bail!("No remote storage configured, but was asked to backup the initdb archive for {} / {}", self.tenant_shard_id.tenant_id, self.timeline_id);
-        }
-        Ok(())
-    }
-
     // Write out the given frozen in-memory layer as a new L0 delta file. This L0 file will not be tracked
     // in layer map immediately. The caller is responsible to put it into the layer map.
     async fn create_delta_layer(
@@ -3138,7 +2950,11 @@ impl Timeline {
     }
 
     // Is it time to create a new image layer for the given partition?
-    async fn time_for_new_image_layer(&self, partition: &KeySpace, lsn: Lsn) -> bool {
+    async fn time_for_new_image_layer(
+        &self,
+        partition: &KeySpace,
+        lsn: Lsn,
+    ) -> anyhow::Result<bool> {
         let threshold = self.get_image_creation_threshold();
 
         let guard = self.layers.read().await;
@@ -3158,20 +2974,20 @@ impl Timeline {
                     // but the range is already covered by image layers at more recent LSNs. Before we
                     // create a new image layer, check if the range is already covered at more recent LSNs.
                     if !layers
-                        .image_layer_exists(&img_range, &(Lsn::min(lsn, *cutoff_lsn)..lsn + 1))
+                        .image_layer_exists(&img_range, &(Lsn::min(lsn, *cutoff_lsn)..lsn + 1))?
                     {
                         debug!(
                             "Force generation of layer {}-{} wanted by GC, cutoff={}, lsn={})",
                             img_range.start, img_range.end, cutoff_lsn, lsn
                         );
-                        return true;
+                        return Ok(true);
                     }
                 }
             }
         }
 
         for part_range in &partition.ranges {
-            let image_coverage = layers.image_coverage(part_range, lsn);
+            let image_coverage = layers.image_coverage(part_range, lsn)?;
             for (img_range, last_img) in image_coverage {
                 let img_lsn = if let Some(last_img) = last_img {
                     last_img.get_lsn_range().end
@@ -3192,7 +3008,7 @@ impl Timeline {
                 // after we read last_record_lsn, which is passed here in the 'lsn' argument.
                 if img_lsn < lsn {
                     let num_deltas =
-                        layers.count_deltas(&img_range, &(img_lsn..lsn), Some(threshold));
+                        layers.count_deltas(&img_range, &(img_lsn..lsn), Some(threshold))?;
 
                     max_deltas = max_deltas.max(num_deltas);
                     if num_deltas >= threshold {
@@ -3200,7 +3016,7 @@ impl Timeline {
                             "key range {}-{}, has {} deltas on this timeline in LSN range {}..{}",
                             img_range.start, img_range.end, num_deltas, img_lsn, lsn
                         );
-                        return true;
+                        return Ok(true);
                     }
                 }
             }
@@ -3210,7 +3026,7 @@ impl Timeline {
             max_deltas,
             "none of the partitioned ranges had >= {threshold} deltas"
         );
-        false
+        Ok(false)
     }
 
     #[tracing::instrument(skip_all, fields(%lsn, %force))]
@@ -3220,7 +3036,7 @@ impl Timeline {
         lsn: Lsn,
         force: bool,
         ctx: &RequestContext,
-    ) -> Result<Vec<ResidentLayer>, CreateImageLayersError> {
+    ) -> Result<Vec<ResidentLayer>, PageReconstructError> {
         let timer = self.metrics.create_images_time_histo.start_timer();
         let mut image_layers = Vec::new();
 
@@ -3238,7 +3054,7 @@ impl Timeline {
         for partition in partitioning.parts.iter() {
             let img_range = start..partition.ranges.last().unwrap().end;
             start = img_range.end;
-            if force || self.time_for_new_image_layer(partition, lsn).await {
+            if force || self.time_for_new_image_layer(partition, lsn).await? {
                 let mut image_layer_writer = ImageLayerWriter::new(
                     self.conf,
                     self.timeline_id,
@@ -3249,12 +3065,10 @@ impl Timeline {
                 .await?;
 
                 fail_point!("image-layer-writer-fail-before-finish", |_| {
-                    Err(CreateImageLayersError::Other(anyhow::anyhow!(
+                    Err(PageReconstructError::Other(anyhow::anyhow!(
                         "failpoint image-layer-writer-fail-before-finish"
                     )))
                 });
-
-                let mut key_request_accum = KeySpaceAccum::new();
                 for range in &partition.ranges {
                     let mut key = range.start;
                     while key < range.end {
@@ -3267,55 +3081,34 @@ impl Timeline {
                             key = key.next();
                             continue;
                         }
-
-                        key_request_accum.add_key(key);
-                        if key_request_accum.size() >= Timeline::MAX_GET_VECTORED_KEYS
-                            || key.next() == range.end
-                        {
-                            let results = self
-                                .get_vectored(
-                                    &key_request_accum.consume_keyspace().ranges,
-                                    lsn,
-                                    ctx,
-                                )
-                                .await?;
-
-                            for (img_key, img) in results {
-                                let img = match img {
-                                    Ok(img) => img,
-                                    Err(err) => {
-                                        // If we fail to reconstruct a VM or FSM page, we can zero the
-                                        // page without losing any actual user data. That seems better
-                                        // than failing repeatedly and getting stuck.
-                                        //
-                                        // We had a bug at one point, where we truncated the FSM and VM
-                                        // in the pageserver, but the Postgres didn't know about that
-                                        // and continued to generate incremental WAL records for pages
-                                        // that didn't exist in the pageserver. Trying to replay those
-                                        // WAL records failed to find the previous image of the page.
-                                        // This special case allows us to recover from that situation.
-                                        // See https://github.com/neondatabase/neon/issues/2601.
-                                        //
-                                        // Unfortunately we cannot do this for the main fork, or for
-                                        // any metadata keys, keys, as that would lead to actual data
-                                        // loss.
-                                        if is_rel_fsm_block_key(img_key)
-                                            || is_rel_vm_block_key(img_key)
-                                        {
-                                            warn!("could not reconstruct FSM or VM key {img_key}, filling with zeros: {err:?}");
-                                            ZERO_PAGE.clone()
-                                        } else {
-                                            return Err(
-                                                CreateImageLayersError::PageReconstructError(err),
-                                            );
-                                        }
-                                    }
-                                };
-
-                                image_layer_writer.put_image(img_key, &img).await?;
+                        let img = match self.get(key, lsn, ctx).await {
+                            Ok(img) => img,
+                            Err(err) => {
+                                // If we fail to reconstruct a VM or FSM page, we can zero the
+                                // page without losing any actual user data. That seems better
+                                // than failing repeatedly and getting stuck.
+                                //
+                                // We had a bug at one point, where we truncated the FSM and VM
+                                // in the pageserver, but the Postgres didn't know about that
+                                // and continued to generate incremental WAL records for pages
+                                // that didn't exist in the pageserver. Trying to replay those
+                                // WAL records failed to find the previous image of the page.
+                                // This special case allows us to recover from that situation.
+                                // See https://github.com/neondatabase/neon/issues/2601.
+                                //
+                                // Unfortunately we cannot do this for the main fork, or for
+                                // any metadata keys, keys, as that would lead to actual data
+                                // loss.
+                                if is_rel_fsm_block_key(key) || is_rel_vm_block_key(key) {
+                                    warn!("could not reconstruct FSM or VM key {key}, filling with zeros: {err:?}");
+                                    ZERO_PAGE.clone()
+                                } else {
+                                    return Err(err);
+                                }
                             }
-                        }
+                        };
 
+                        image_layer_writer.put_image(key, &img).await?;
                         key = key.next();
                     }
                 }
@@ -3691,7 +3484,7 @@ impl Timeline {
                     // has not so much sense, because largest holes will corresponds field1/field2 changes.
                     // But we are mostly interested to eliminate holes which cause generation of excessive image layers.
                     // That is why it is better to measure size of hole as number of covering image layers.
-                    let coverage_size = layers.image_coverage(&key_range, last_record_lsn).len();
+                    let coverage_size = layers.image_coverage(&key_range, last_record_lsn)?.len();
                     if coverage_size >= min_hole_coverage_size {
                         heap.push(Hole {
                             key_range,
@@ -4317,7 +4110,7 @@ impl Timeline {
             // we cannot remove C, even though it's older than 2500, because
             // the delta layer 2000-3000 depends on it.
             if !layers
-                .image_layer_exists(&l.get_key_range(), &(l.get_lsn_range().end..new_gc_cutoff))
+                .image_layer_exists(&l.get_key_range(), &(l.get_lsn_range().end..new_gc_cutoff))?
             {
                 debug!("keeping {} because it is the latest layer", l.filename());
                 // Collect delta key ranges that need image layers to allow garbage
@@ -4447,7 +4240,7 @@ impl Timeline {
                     .walredo_mgr
                     .request_redo(key, request_lsn, data.img, data.records, self.pg_version)
                     .await
-                    .context("reconstruct a page image")
+                    .context("Failed to reconstruct a page image:")
                 {
                     Ok(img) => img,
                     Err(e) => return Err(PageReconstructError::WalRedo(e)),

pageserver/src/tenant/timeline/delete.rs

@@ -356,14 +356,12 @@ impl DeleteTimelineFlow {
     // NB: If this fails half-way through, and is retried, the retry will go through
     // all the same steps again. Make sure the code here is idempotent, and don't
     // error out if some of the shutdown tasks have already been completed!
-    #[instrument(skip_all, fields(%inplace))]
+    #[instrument(skip(tenant), fields(tenant_id=%tenant.tenant_shard_id.tenant_id, shard_id=%tenant.tenant_shard_id.shard_slug()))]
     pub async fn run(
         tenant: &Arc<Tenant>,
         timeline_id: TimelineId,
         inplace: bool,
     ) -> Result<(), DeleteTimelineError> {
-        super::debug_assert_current_span_has_tenant_and_timeline_id();
-
         let (timeline, mut guard) = Self::prepare(tenant, timeline_id)?;
 
         guard.mark_in_progress()?;

pageserver/src/tenant/upload_queue.rs

@@ -126,27 +126,6 @@ pub(super) struct UploadQueueStopped {
     pub(super) deleted_at: SetDeletedFlagProgress,
 }
 
-#[derive(thiserror::Error, Debug)]
-pub(crate) enum NotInitialized {
-    #[error("queue is in state Uninitialized")]
-    Uninitialized,
-    #[error("queue is in state Stopping")]
-    Stopped,
-    #[error("queue is shutting down")]
-    ShuttingDown,
-}
-
-impl NotInitialized {
-    pub(crate) fn is_stopping(&self) -> bool {
-        use NotInitialized::*;
-        match self {
-            Uninitialized => false,
-            Stopped => true,
-            ShuttingDown => true,
-        }
-    }
-}
-
 impl UploadQueue {
     pub(crate) fn initialize_empty_remote(
         &mut self,
@@ -235,17 +214,17 @@ impl UploadQueue {
     }
 
     pub(crate) fn initialized_mut(&mut self) -> anyhow::Result<&mut UploadQueueInitialized> {
-        use UploadQueue::*;
         match self {
-            Uninitialized => Err(NotInitialized::Uninitialized.into()),
-            Initialized(x) => {
-                if x.shutting_down {
-                    Err(NotInitialized::ShuttingDown.into())
-                } else {
+            UploadQueue::Uninitialized | UploadQueue::Stopped(_) => {
+                anyhow::bail!("queue is in state {}", self.as_str())
+            }
+            UploadQueue::Initialized(x) => {
+                if !x.shutting_down {
                     Ok(x)
+                } else {
+                    anyhow::bail!("queue is shutting down")
                 }
             }
-            Stopped(_) => Err(NotInitialized::Stopped.into()),
         }
     }
 

pageserver/src/virtual_file.rs

@@ -11,28 +11,18 @@
 //! src/backend/storage/file/fd.c
 //!
 use crate::metrics::{StorageIoOperation, STORAGE_IO_SIZE, STORAGE_IO_TIME_METRIC};
-
-use crate::page_cache::PageWriteGuard;
 use crate::tenant::TENANTS_SEGMENT_NAME;
 use camino::{Utf8Path, Utf8PathBuf};
 use once_cell::sync::OnceCell;
 use pageserver_api::shard::TenantShardId;
-use std::fs::{self, File};
+use std::fs::{self, File, OpenOptions};
 use std::io::{Error, ErrorKind, Seek, SeekFrom};
-use tokio_epoll_uring::IoBufMut;
-
-use std::os::fd::{AsRawFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
 use std::os::unix::fs::FileExt;
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use tokio::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard};
 use tokio::time::Instant;
 use utils::fs_ext;
 
-mod io_engine;
-mod open_options;
-pub use io_engine::IoEngineKind;
-pub(crate) use open_options::*;
-
 ///
 /// A virtual file descriptor. You can use this just like std::fs::File, but internally
 /// the underlying file is closed if the system is low on file descriptors,
@@ -116,38 +106,7 @@ struct SlotInner {
     tag: u64,
 
     /// the underlying file
-    file: Option<OwnedFd>,
-}
-
-/// Impl of [`tokio_epoll_uring::IoBuf`] and [`tokio_epoll_uring::IoBufMut`] for [`PageWriteGuard`].
-struct PageWriteGuardBuf {
-    page: PageWriteGuard<'static>,
-    init_up_to: usize,
-}
-// Safety: the [`PageWriteGuard`] gives us exclusive ownership of the page cache slot,
-// and the location remains stable even if [`Self`] or the [`PageWriteGuard`] is moved.
-unsafe impl tokio_epoll_uring::IoBuf for PageWriteGuardBuf {
-    fn stable_ptr(&self) -> *const u8 {
-        self.page.as_ptr()
-    }
-    fn bytes_init(&self) -> usize {
-        self.init_up_to
-    }
-    fn bytes_total(&self) -> usize {
-        self.page.len()
-    }
-}
-// Safety: see above, plus: the ownership of [`PageWriteGuard`] means exclusive access,
-// hence it's safe to hand out the `stable_mut_ptr()`.
-unsafe impl tokio_epoll_uring::IoBufMut for PageWriteGuardBuf {
-    fn stable_mut_ptr(&mut self) -> *mut u8 {
-        self.page.as_mut_ptr()
-    }
-
-    unsafe fn set_init(&mut self, pos: usize) {
-        assert!(pos <= self.page.len());
-        self.init_up_to = pos;
-    }
+    file: Option<File>,
 }
 
 impl OpenFiles {
@@ -315,10 +274,6 @@ macro_rules! with_file {
         let $ident = $this.lock_file().await?;
         observe_duration!($op, $($body)*)
     }};
-    ($this:expr, $op:expr, | mut $ident:ident | $($body:tt)*) => {{
-        let mut $ident = $this.lock_file().await?;
-        observe_duration!($op, $($body)*)
-    }};
 }
 
 impl VirtualFile {
@@ -371,9 +326,7 @@ impl VirtualFile {
         // NB: there is also StorageIoOperation::OpenAfterReplace which is for the case
         // where our caller doesn't get to use the returned VirtualFile before its
         // slot gets re-used by someone else.
-        let file = observe_duration!(StorageIoOperation::Open, {
-            open_options.open(path.as_std_path()).await?
-        });
+        let file = observe_duration!(StorageIoOperation::Open, open_options.open(path))?;
 
         // Strip all options other than read and write.
         //
@@ -447,13 +400,15 @@ impl VirtualFile {
 
     /// Call File::sync_all() on the underlying File.
     pub async fn sync_all(&self) -> Result<(), Error> {
-        with_file!(self, StorageIoOperation::Fsync, |file_guard| file_guard
-            .with_std_file(|std_file| std_file.sync_all()))
+        with_file!(self, StorageIoOperation::Fsync, |file| file
+            .as_ref()
+            .sync_all())
     }
 
     pub async fn metadata(&self) -> Result<fs::Metadata, Error> {
-        with_file!(self, StorageIoOperation::Metadata, |file_guard| file_guard
-            .with_std_file(|std_file| std_file.metadata()))
+        with_file!(self, StorageIoOperation::Metadata, |file| file
+            .as_ref()
+            .metadata())
     }
 
     /// Helper function internal to `VirtualFile` that looks up the underlying File,
@@ -462,7 +417,7 @@ impl VirtualFile {
     ///
     /// We are doing it via a macro as Rust doesn't support async closures that
     /// take on parameters with lifetimes.
-    async fn lock_file(&self) -> Result<FileGuard, Error> {
+    async fn lock_file(&self) -> Result<FileGuard<'_>, Error> {
         let open_files = get_open_files();
 
         let mut handle_guard = {
@@ -508,9 +463,10 @@ impl VirtualFile {
         // NB: we use StorageIoOperation::OpenAferReplace for this to distinguish this
         // case from StorageIoOperation::Open. This helps with identifying thrashing
         // of the virtual file descriptor cache.
-        let file = observe_duration!(StorageIoOperation::OpenAfterReplace, {
-            self.open_options.open(self.path.as_std_path()).await?
-        });
+        let file = observe_duration!(
+            StorageIoOperation::OpenAfterReplace,
+            self.open_options.open(&self.path)
+        )?;
 
         // Store the File in the slot and update the handle in the VirtualFile
         // to point to it.
@@ -535,8 +491,9 @@ impl VirtualFile {
                 self.pos = offset;
             }
             SeekFrom::End(offset) => {
-                self.pos = with_file!(self, StorageIoOperation::Seek, |mut file_guard| file_guard
-                    .with_std_file_mut(|std_file| std_file.seek(SeekFrom::End(offset))))?
+                self.pos = with_file!(self, StorageIoOperation::Seek, |file| file
+                    .as_ref()
+                    .seek(SeekFrom::End(offset)))?
             }
             SeekFrom::Current(offset) => {
                 let pos = self.pos as i128 + offset as i128;
@@ -555,28 +512,25 @@ impl VirtualFile {
         Ok(self.pos)
     }
 
-    pub async fn read_exact_at<B>(&self, buf: B, offset: u64) -> Result<B, Error>
-    where
-        B: IoBufMut + Send,
-    {
-        let (buf, res) =
-            read_exact_at_impl(buf, offset, |buf, offset| self.read_at(buf, offset)).await;
-        res.map(|()| buf)
-    }
-
-    /// Like [`Self::read_exact_at`] but for [`PageWriteGuard`].
-    pub async fn read_exact_at_page(
-        &self,
-        page: PageWriteGuard<'static>,
-        offset: u64,
-    ) -> Result<PageWriteGuard<'static>, Error> {
-        let buf = PageWriteGuardBuf {
-            page,
-            init_up_to: 0,
-        };
-        let res = self.read_exact_at(buf, offset).await;
-        res.map(|PageWriteGuardBuf { page, .. }| page)
-            .map_err(|e| Error::new(ErrorKind::Other, e))
+    // Copied from https://doc.rust-lang.org/1.72.0/src/std/os/unix/fs.rs.html#117-135
+    pub async fn read_exact_at(&self, mut buf: &mut [u8], mut offset: u64) -> Result<(), Error> {
+        while !buf.is_empty() {
+            match self.read_at(buf, offset).await {
+                Ok(0) => {
+                    return Err(Error::new(
+                        std::io::ErrorKind::UnexpectedEof,
+                        "failed to fill whole buffer",
+                    ))
+                }
+                Ok(n) => {
+                    buf = &mut buf[n..];
+                    offset += n as u64;
+                }
+                Err(ref e) if e.kind() == std::io::ErrorKind::Interrupted => {}
+                Err(e) => return Err(e),
+            }
+        }
+        Ok(())
     }
 
     // Copied from https://doc.rust-lang.org/1.72.0/src/std/os/unix/fs.rs.html#219-235
@@ -626,35 +580,22 @@ impl VirtualFile {
         Ok(n)
     }
 
-    pub(crate) async fn read_at<B>(&self, buf: B, offset: u64) -> (B, Result<usize, Error>)
-    where
-        B: tokio_epoll_uring::BoundedBufMut + Send,
-    {
-        let file_guard = match self.lock_file().await {
-            Ok(file_guard) => file_guard,
-            Err(e) => return (buf, Err(e)),
-        };
-
-        observe_duration!(StorageIoOperation::Read, {
-            let ((_file_guard, buf), res) = io_engine::get().read_at(file_guard, offset, buf).await;
-            if let Ok(size) = res {
-                STORAGE_IO_SIZE
-                    .with_label_values(&[
-                        "read",
-                        &self.tenant_id,
-                        &self.shard_id,
-                        &self.timeline_id,
-                    ])
-                    .add(size as i64);
-            }
-            (buf, res)
-        })
+    pub async fn read_at(&self, buf: &mut [u8], offset: u64) -> Result<usize, Error> {
+        let result = with_file!(self, StorageIoOperation::Read, |file| file
+            .as_ref()
+            .read_at(buf, offset));
+        if let Ok(size) = result {
+            STORAGE_IO_SIZE
+                .with_label_values(&["read", &self.tenant_id, &self.shard_id, &self.timeline_id])
+                .add(size as i64);
+        }
+        result
     }
 
     async fn write_at(&self, buf: &[u8], offset: u64) -> Result<usize, Error> {
-        let result = with_file!(self, StorageIoOperation::Write, |file_guard| {
-            file_guard.with_std_file(|std_file| std_file.write_at(buf, offset))
-        });
+        let result = with_file!(self, StorageIoOperation::Write, |file| file
+            .as_ref()
+            .write_at(buf, offset));
         if let Ok(size) = result {
             STORAGE_IO_SIZE
                 .with_label_values(&["write", &self.tenant_id, &self.shard_id, &self.timeline_id])
@@ -664,241 +605,18 @@ impl VirtualFile {
     }
 }
 
-// Adapted from https://doc.rust-lang.org/1.72.0/src/std/os/unix/fs.rs.html#117-135
-pub async fn read_exact_at_impl<B, F, Fut>(
-    buf: B,
-    mut offset: u64,
-    mut read_at: F,
-) -> (B, std::io::Result<()>)
-where
-    B: IoBufMut + Send,
-    F: FnMut(tokio_epoll_uring::Slice<B>, u64) -> Fut,
-    Fut: std::future::Future<Output = (tokio_epoll_uring::Slice<B>, std::io::Result<usize>)>,
-{
-    use tokio_epoll_uring::BoundedBuf;
-    let mut buf: tokio_epoll_uring::Slice<B> = buf.slice_full(); // includes all the uninitialized memory
-    while buf.bytes_total() != 0 {
-        let res;
-        (buf, res) = read_at(buf, offset).await;
-        match res {
-            Ok(0) => break,
-            Ok(n) => {
-                buf = buf.slice(n..);
-                offset += n as u64;
-            }
-            Err(ref e) if e.kind() == std::io::ErrorKind::Interrupted => {}
-            Err(e) => return (buf.into_inner(), Err(e)),
-        }
-    }
-    // NB: don't use `buf.is_empty()` here; it is from the
-    // `impl Deref for Slice { Target = [u8] }`; the the &[u8]
-    // returned by it only covers the initialized portion of `buf`.
-    // Whereas we're interested in ensuring that we filled the entire
-    // buffer that the user passed in.
-    if buf.bytes_total() != 0 {
-        (
-            buf.into_inner(),
-            Err(std::io::Error::new(
-                std::io::ErrorKind::UnexpectedEof,
-                "failed to fill whole buffer",
-            )),
-        )
-    } else {
-        assert_eq!(buf.len(), buf.bytes_total());
-        (buf.into_inner(), Ok(()))
-    }
+struct FileGuard<'a> {
+    slot_guard: RwLockReadGuard<'a, SlotInner>,
 }
 
-#[cfg(test)]
-mod test_read_exact_at_impl {
-
-    use std::{collections::VecDeque, sync::Arc};
-
-    use tokio_epoll_uring::{BoundedBuf, BoundedBufMut};
-
-    use super::read_exact_at_impl;
-
-    struct Expectation {
-        offset: u64,
-        bytes_total: usize,
-        result: std::io::Result<Vec<u8>>,
-    }
-    struct MockReadAt {
-        expectations: VecDeque<Expectation>,
-    }
-
-    impl MockReadAt {
-        async fn read_at(
-            &mut self,
-            mut buf: tokio_epoll_uring::Slice<Vec<u8>>,
-            offset: u64,
-        ) -> (tokio_epoll_uring::Slice<Vec<u8>>, std::io::Result<usize>) {
-            let exp = self
-                .expectations
-                .pop_front()
-                .expect("read_at called but we have no expectations left");
-            assert_eq!(exp.offset, offset);
-            assert_eq!(exp.bytes_total, buf.bytes_total());
-            match exp.result {
-                Ok(bytes) => {
-                    assert!(bytes.len() <= buf.bytes_total());
-                    buf.put_slice(&bytes);
-                    (buf, Ok(bytes.len()))
-                }
-                Err(e) => (buf, Err(e)),
-            }
-        }
-    }
-
-    impl Drop for MockReadAt {
-        fn drop(&mut self) {
-            assert_eq!(self.expectations.len(), 0);
-        }
-    }
-
-    #[tokio::test]
-    async fn test_basic() {
-        let buf = Vec::with_capacity(5);
-        let mock_read_at = Arc::new(tokio::sync::Mutex::new(MockReadAt {
-            expectations: VecDeque::from(vec![Expectation {
-                offset: 0,
-                bytes_total: 5,
-                result: Ok(vec![b'a', b'b', b'c', b'd', b'e']),
-            }]),
-        }));
-        let (buf, res) = read_exact_at_impl(buf, 0, |buf, offset| {
-            let mock_read_at = Arc::clone(&mock_read_at);
-            async move { mock_read_at.lock().await.read_at(buf, offset).await }
-        })
-        .await;
-        assert!(res.is_ok());
-        assert_eq!(buf, vec![b'a', b'b', b'c', b'd', b'e']);
-    }
-
-    #[tokio::test]
-    async fn test_empty_buf_issues_no_syscall() {
-        let buf = Vec::new();
-        let mock_read_at = Arc::new(tokio::sync::Mutex::new(MockReadAt {
-            expectations: VecDeque::new(),
-        }));
-        let (_buf, res) = read_exact_at_impl(buf, 0, |buf, offset| {
-            let mock_read_at = Arc::clone(&mock_read_at);
-            async move { mock_read_at.lock().await.read_at(buf, offset).await }
-        })
-        .await;
-        assert!(res.is_ok());
-    }
-
-    #[tokio::test]
-    async fn test_two_read_at_calls_needed_until_buf_filled() {
-        let buf = Vec::with_capacity(4);
-        let mock_read_at = Arc::new(tokio::sync::Mutex::new(MockReadAt {
-            expectations: VecDeque::from(vec![
-                Expectation {
-                    offset: 0,
-                    bytes_total: 4,
-                    result: Ok(vec![b'a', b'b']),
-                },
-                Expectation {
-                    offset: 2,
-                    bytes_total: 2,
-                    result: Ok(vec![b'c', b'd']),
-                },
-            ]),
-        }));
-        let (buf, res) = read_exact_at_impl(buf, 0, |buf, offset| {
-            let mock_read_at = Arc::clone(&mock_read_at);
-            async move { mock_read_at.lock().await.read_at(buf, offset).await }
-        })
-        .await;
-        assert!(res.is_ok());
-        assert_eq!(buf, vec![b'a', b'b', b'c', b'd']);
-    }
-
-    #[tokio::test]
-    async fn test_eof_before_buffer_full() {
-        let buf = Vec::with_capacity(3);
-        let mock_read_at = Arc::new(tokio::sync::Mutex::new(MockReadAt {
-            expectations: VecDeque::from(vec![
-                Expectation {
-                    offset: 0,
-                    bytes_total: 3,
-                    result: Ok(vec![b'a']),
-                },
-                Expectation {
-                    offset: 1,
-                    bytes_total: 2,
-                    result: Ok(vec![b'b']),
-                },
-                Expectation {
-                    offset: 2,
-                    bytes_total: 1,
-                    result: Ok(vec![]),
-                },
-            ]),
-        }));
-        let (_buf, res) = read_exact_at_impl(buf, 0, |buf, offset| {
-            let mock_read_at = Arc::clone(&mock_read_at);
-            async move { mock_read_at.lock().await.read_at(buf, offset).await }
-        })
-        .await;
-        let Err(err) = res else {
-            panic!("should return an error");
-        };
-        assert_eq!(err.kind(), std::io::ErrorKind::UnexpectedEof);
-        assert_eq!(format!("{err}"), "failed to fill whole buffer");
-        // buffer contents on error are unspecified
-    }
-}
-
-struct FileGuard {
-    slot_guard: RwLockReadGuard<'static, SlotInner>,
-}
-
-impl AsRef<OwnedFd> for FileGuard {
-    fn as_ref(&self) -> &OwnedFd {
+impl<'a> AsRef<File> for FileGuard<'a> {
+    fn as_ref(&self) -> &File {
         // This unwrap is safe because we only create `FileGuard`s
         // if we know that the file is Some.
         self.slot_guard.file.as_ref().unwrap()
     }
 }
 
-impl FileGuard {
-    /// Soft deprecation: we'll move VirtualFile to async APIs and remove this function eventually.
-    fn with_std_file<F, R>(&self, with: F) -> R
-    where
-        F: FnOnce(&File) -> R,
-    {
-        // SAFETY:
-        // - lifetime of the fd: `file` doesn't outlive the OwnedFd stored in `self`.
-        // - `&` usage below: `self` is `&`, hence Rust typesystem guarantees there are is no `&mut`
-        let file = unsafe { File::from_raw_fd(self.as_ref().as_raw_fd()) };
-        let res = with(&file);
-        let _ = file.into_raw_fd();
-        res
-    }
-    /// Soft deprecation: we'll move VirtualFile to async APIs and remove this function eventually.
-    fn with_std_file_mut<F, R>(&mut self, with: F) -> R
-    where
-        F: FnOnce(&mut File) -> R,
-    {
-        // SAFETY:
-        // - lifetime of the fd: `file` doesn't outlive the OwnedFd stored in `self`.
-        // - &mut usage below: `self` is `&mut`, hence this call is the only task/thread that has control over the underlying fd
-        let mut file = unsafe { File::from_raw_fd(self.as_ref().as_raw_fd()) };
-        let res = with(&mut file);
-        let _ = file.into_raw_fd();
-        res
-    }
-}
-
-impl tokio_epoll_uring::IoFd for FileGuard {
-    unsafe fn as_fd(&self) -> RawFd {
-        let owned_fd: &OwnedFd = self.as_ref();
-        owned_fd.as_raw_fd()
-    }
-}
-
 #[cfg(test)]
 impl VirtualFile {
     pub(crate) async fn read_blk(
@@ -906,19 +624,16 @@ impl VirtualFile {
         blknum: u32,
     ) -> Result<crate::tenant::block_io::BlockLease<'_>, std::io::Error> {
         use crate::page_cache::PAGE_SZ;
-        let buf = vec![0; PAGE_SZ];
-        let buf = self
-            .read_exact_at(buf, blknum as u64 * (PAGE_SZ as u64))
+        let mut buf = [0; PAGE_SZ];
+        self.read_exact_at(&mut buf, blknum as u64 * (PAGE_SZ as u64))
             .await?;
-        Ok(crate::tenant::block_io::BlockLease::Vec(buf))
+        Ok(std::sync::Arc::new(buf).into())
     }
 
     async fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<(), Error> {
-        let mut tmp = vec![0; 128];
         loop {
-            let res;
-            (tmp, res) = self.read_at(tmp, self.pos).await;
-            match res {
+            let mut tmp = [0; 128];
+            match self.read_at(&mut tmp, self.pos).await {
                 Ok(0) => return Ok(()),
                 Ok(n) => {
                     self.pos += n as u64;
@@ -994,12 +709,10 @@ impl OpenFiles {
 /// Initialize the virtual file module. This must be called once at page
 /// server startup.
 ///
-#[cfg(not(test))]
-pub fn init(num_slots: usize, engine: IoEngineKind) {
+pub fn init(num_slots: usize) {
     if OPEN_FILES.set(OpenFiles::new(num_slots)).is_err() {
         panic!("virtual_file::init called twice");
     }
-    io_engine::init(engine);
     crate::metrics::virtual_file_descriptor_cache::SIZE_MAX.set(num_slots as u64);
 }
 
@@ -1044,10 +757,10 @@ mod tests {
     }
 
     impl MaybeVirtualFile {
-        async fn read_exact_at(&self, mut buf: Vec<u8>, offset: u64) -> Result<Vec<u8>, Error> {
+        async fn read_exact_at(&self, buf: &mut [u8], offset: u64) -> Result<(), Error> {
             match self {
                 MaybeVirtualFile::VirtualFile(file) => file.read_exact_at(buf, offset).await,
-                MaybeVirtualFile::File(file) => file.read_exact_at(&mut buf, offset).map(|()| buf),
+                MaybeVirtualFile::File(file) => file.read_exact_at(buf, offset),
             }
         }
         async fn write_all_at(&self, buf: &[u8], offset: u64) -> Result<(), Error> {
@@ -1089,14 +802,14 @@ mod tests {
 
         // Helper function to slurp a portion of a file into a string
         async fn read_string_at(&mut self, pos: u64, len: usize) -> Result<String, Error> {
-            let buf = vec![0; len];
-            let buf = self.read_exact_at(buf, pos).await?;
+            let mut buf = vec![0; len];
+            self.read_exact_at(&mut buf, pos).await?;
             Ok(String::from_utf8(buf).unwrap())
         }
     }
 
     #[tokio::test]
-    async fn test_virtual_files() -> anyhow::Result<()> {
+    async fn test_virtual_files() -> Result<(), Error> {
         // The real work is done in the test_files() helper function. This
         // allows us to run the same set of tests against a native File, and
         // VirtualFile. We trust the native Files and wouldn't need to test them,
@@ -1112,17 +825,14 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn test_physical_files() -> anyhow::Result<()> {
+    async fn test_physical_files() -> Result<(), Error> {
         test_files("physical_files", |path, open_options| async move {
-            Ok(MaybeVirtualFile::File({
-                let owned_fd = open_options.open(path.as_std_path()).await?;
-                File::from(owned_fd)
-            }))
+            Ok(MaybeVirtualFile::File(open_options.open(path)?))
         })
         .await
     }
 
-    async fn test_files<OF, FT>(testname: &str, openfunc: OF) -> anyhow::Result<()>
+    async fn test_files<OF, FT>(testname: &str, openfunc: OF) -> Result<(), Error>
     where
         OF: Fn(Utf8PathBuf, OpenOptions) -> FT,
         FT: Future<Output = Result<MaybeVirtualFile, std::io::Error>>,
@@ -1266,11 +976,11 @@ mod tests {
         for _threadno in 0..THREADS {
             let files = files.clone();
             let hdl = rt.spawn(async move {
-                let mut buf = vec![0u8; SIZE];
+                let mut buf = [0u8; SIZE];
                 let mut rng = rand::rngs::OsRng;
                 for _ in 1..1000 {
                     let f = &files[rng.gen_range(0..files.len())];
-                    buf = f.read_exact_at(buf, 0).await.unwrap();
+                    f.read_exact_at(&mut buf, 0).await.unwrap();
                     assert!(buf == SAMPLE);
                 }
             });

pageserver/src/virtual_file/io_engine.rs

@@ -1,114 +0,0 @@
-//! [`super::VirtualFile`] supports different IO engines.
-//!
-//! The [`IoEngineKind`] enum identifies them.
-//!
-//! The choice of IO engine is global.
-//! Initialize using [`init`].
-//!
-//! Then use [`get`] and  [`super::OpenOptions`].
-
-#[derive(
-    Copy,
-    Clone,
-    PartialEq,
-    Eq,
-    Hash,
-    strum_macros::EnumString,
-    strum_macros::Display,
-    serde_with::DeserializeFromStr,
-    serde_with::SerializeDisplay,
-    Debug,
-)]
-#[strum(serialize_all = "kebab-case")]
-pub enum IoEngineKind {
-    StdFs,
-    #[cfg(target_os = "linux")]
-    TokioEpollUring,
-}
-
-static IO_ENGINE: once_cell::sync::OnceCell<IoEngineKind> = once_cell::sync::OnceCell::new();
-
-#[cfg(not(test))]
-pub(super) fn init(engine: IoEngineKind) {
-    if IO_ENGINE.set(engine).is_err() {
-        panic!("called twice");
-    }
-    crate::metrics::virtual_file_io_engine::KIND
-        .with_label_values(&[&format!("{engine}")])
-        .set(1);
-}
-
-pub(super) fn get() -> &'static IoEngineKind {
-    #[cfg(test)]
-    {
-        let env_var_name = "NEON_PAGESERVER_UNIT_TEST_VIRTUAL_FILE_IOENGINE";
-        IO_ENGINE.get_or_init(|| match std::env::var(env_var_name) {
-            Ok(v) => match v.parse::<IoEngineKind>() {
-                Ok(engine_kind) => engine_kind,
-                Err(e) => {
-                    panic!("invalid VirtualFile io engine for env var {env_var_name}: {e:#}: {v:?}")
-                }
-            },
-            Err(std::env::VarError::NotPresent) => {
-                crate::config::defaults::DEFAULT_VIRTUAL_FILE_IO_ENGINE
-                    .parse()
-                    .unwrap()
-            }
-            Err(std::env::VarError::NotUnicode(_)) => {
-                panic!("env var {env_var_name} is not unicode");
-            }
-        })
-    }
-    #[cfg(not(test))]
-    IO_ENGINE.get().unwrap()
-}
-
-use std::os::unix::prelude::FileExt;
-
-use super::FileGuard;
-
-impl IoEngineKind {
-    pub(super) async fn read_at<B>(
-        &self,
-        file_guard: FileGuard,
-        offset: u64,
-        mut buf: B,
-    ) -> ((FileGuard, B), std::io::Result<usize>)
-    where
-        B: tokio_epoll_uring::BoundedBufMut + Send,
-    {
-        match self {
-            IoEngineKind::StdFs => {
-                // SAFETY: `dst` only lives at most as long as this match arm, during which buf remains valid memory.
-                let dst = unsafe {
-                    std::slice::from_raw_parts_mut(buf.stable_mut_ptr(), buf.bytes_total())
-                };
-                let res = file_guard.with_std_file(|std_file| std_file.read_at(dst, offset));
-                if let Ok(nbytes) = &res {
-                    assert!(*nbytes <= buf.bytes_total());
-                    // SAFETY: see above assertion
-                    unsafe {
-                        buf.set_init(*nbytes);
-                    }
-                }
-                #[allow(dropping_references)]
-                drop(dst);
-                ((file_guard, buf), res)
-            }
-            #[cfg(target_os = "linux")]
-            IoEngineKind::TokioEpollUring => {
-                let system = tokio_epoll_uring::thread_local_system().await;
-                let (resources, res) = system.read(file_guard, offset, buf).await;
-                (
-                    resources,
-                    res.map_err(|e| match e {
-                        tokio_epoll_uring::Error::Op(e) => e,
-                        tokio_epoll_uring::Error::System(system) => {
-                            std::io::Error::new(std::io::ErrorKind::Other, system)
-                        }
-                    }),
-                )
-            }
-        }
-    }
-}