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ed923b6102
There are tiny modifications in the comments and the tests, and also we did the routes.rs changes in an earlier PR. Otherwise, this is just the changes from that PR. --------- Co-authored-by: Arpad Müller <arpad-m@users.noreply.github.com>
241 lines
9.9 KiB
Python
241 lines
9.9 KiB
Python
import time
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from datetime import datetime, timedelta, timezone
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from fixtures.log_helper import log
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from fixtures.neon_fixtures import NeonEnvBuilder, wait_for_last_flush_lsn
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from fixtures.pageserver.http import PageserverApiException
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from fixtures.types import Lsn
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from fixtures.utils import query_scalar
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#
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# Test pageserver get_lsn_by_timestamp API
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#
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def test_lsn_mapping_old(neon_env_builder: NeonEnvBuilder):
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env = neon_env_builder.init_start()
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new_timeline_id = env.neon_cli.create_branch("test_lsn_mapping")
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endpoint_main = env.endpoints.create_start("test_lsn_mapping")
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log.info("postgres is running on 'test_lsn_mapping' branch")
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cur = endpoint_main.connect().cursor()
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# Create table, and insert rows, each in a separate transaction
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# Disable synchronous_commit to make this initialization go faster.
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#
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# Each row contains current insert LSN and the current timestamp, when
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# the row was inserted.
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cur.execute("SET synchronous_commit=off")
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cur.execute("CREATE TABLE foo (x integer)")
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tbl = []
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for i in range(1000):
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cur.execute("INSERT INTO foo VALUES(%s)", (i,))
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# Get the timestamp at UTC
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after_timestamp = query_scalar(cur, "SELECT clock_timestamp()").replace(tzinfo=None)
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tbl.append([i, after_timestamp])
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# Execute one more transaction with synchronous_commit enabled, to flush
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# all the previous transactions
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cur.execute("SET synchronous_commit=on")
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cur.execute("INSERT INTO foo VALUES (-1)")
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# Wait until WAL is received by pageserver
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wait_for_last_flush_lsn(env, endpoint_main, env.initial_tenant, new_timeline_id)
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with env.pageserver.http_client() as client:
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# Check edge cases: timestamp in the future
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probe_timestamp = tbl[-1][1] + timedelta(hours=1)
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result = client.timeline_get_lsn_by_timestamp(
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env.initial_tenant, new_timeline_id, f"{probe_timestamp.isoformat()}Z", 1
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)
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assert result == "future"
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# timestamp too the far history
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probe_timestamp = tbl[0][1] - timedelta(hours=10)
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result = client.timeline_get_lsn_by_timestamp(
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env.initial_tenant, new_timeline_id, f"{probe_timestamp.isoformat()}Z", 1
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)
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assert result == "past"
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# Probe a bunch of timestamps in the valid range
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for i in range(1, len(tbl), 100):
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probe_timestamp = tbl[i][1]
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lsn = client.timeline_get_lsn_by_timestamp(
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env.initial_tenant, new_timeline_id, f"{probe_timestamp.isoformat()}Z", 1
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)
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# Call get_lsn_by_timestamp to get the LSN
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# Launch a new read-only node at that LSN, and check that only the rows
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# that were supposed to be committed at that point in time are visible.
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endpoint_here = env.endpoints.create_start(
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branch_name="test_lsn_mapping", endpoint_id="ep-lsn_mapping_read", lsn=lsn
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)
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assert endpoint_here.safe_psql("SELECT max(x) FROM foo")[0][0] == i
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endpoint_here.stop_and_destroy()
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#
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# Test pageserver get_lsn_by_timestamp API
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#
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def test_lsn_mapping(neon_env_builder: NeonEnvBuilder):
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env = neon_env_builder.init_start()
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new_timeline_id = env.neon_cli.create_branch("test_lsn_mapping")
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endpoint_main = env.endpoints.create_start("test_lsn_mapping")
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log.info("postgres is running on 'test_lsn_mapping' branch")
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cur = endpoint_main.connect().cursor()
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# Create table, and insert rows, each in a separate transaction
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# Disable `synchronous_commit` to make this initialization go faster.
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# XXX: on my laptop this test takes 7s, and setting `synchronous_commit=off`
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# doesn't change anything.
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#
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# Each row contains current insert LSN and the current timestamp, when
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# the row was inserted.
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cur.execute("SET synchronous_commit=off")
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cur.execute("CREATE TABLE foo (x integer)")
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tbl = []
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for i in range(1000):
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cur.execute("INSERT INTO foo VALUES(%s)", (i,))
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# Get the timestamp at UTC
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after_timestamp = query_scalar(cur, "SELECT clock_timestamp()").replace(tzinfo=None)
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tbl.append([i, after_timestamp])
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# Execute one more transaction with synchronous_commit enabled, to flush
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# all the previous transactions
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cur.execute("SET synchronous_commit=on")
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cur.execute("INSERT INTO foo VALUES (-1)")
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# Wait until WAL is received by pageserver
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wait_for_last_flush_lsn(env, endpoint_main, env.initial_tenant, new_timeline_id)
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with env.pageserver.http_client() as client:
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# Check edge cases
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# Timestamp is in the future
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probe_timestamp = tbl[-1][1] + timedelta(hours=1)
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result = client.timeline_get_lsn_by_timestamp(
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env.initial_tenant, new_timeline_id, f"{probe_timestamp.isoformat()}Z", 2
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)
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assert result["kind"] in ["present", "future"]
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# Timestamp is in the unreachable past
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probe_timestamp = tbl[0][1] - timedelta(hours=10)
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result = client.timeline_get_lsn_by_timestamp(
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env.initial_tenant, new_timeline_id, f"{probe_timestamp.isoformat()}Z", 2
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)
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assert result["kind"] == "past"
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# Probe a bunch of timestamps in the valid range
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for i in range(1, len(tbl), 100):
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probe_timestamp = tbl[i][1]
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result = client.timeline_get_lsn_by_timestamp(
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env.initial_tenant, new_timeline_id, f"{probe_timestamp.isoformat()}Z", 2
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)
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assert result["kind"] not in ["past", "nodata"]
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lsn = result["lsn"]
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# Call get_lsn_by_timestamp to get the LSN
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# Launch a new read-only node at that LSN, and check that only the rows
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# that were supposed to be committed at that point in time are visible.
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endpoint_here = env.endpoints.create_start(
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branch_name="test_lsn_mapping", endpoint_id="ep-lsn_mapping_read", lsn=lsn
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)
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assert endpoint_here.safe_psql("SELECT max(x) FROM foo")[0][0] == i
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endpoint_here.stop_and_destroy()
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# Test pageserver get_timestamp_of_lsn API
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def test_ts_of_lsn_api(neon_env_builder: NeonEnvBuilder):
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env = neon_env_builder.init_start()
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new_timeline_id = env.neon_cli.create_branch("test_ts_of_lsn_api")
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endpoint_main = env.endpoints.create_start("test_ts_of_lsn_api")
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log.info("postgres is running on 'test_ts_of_lsn_api' branch")
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cur = endpoint_main.connect().cursor()
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# Create table, and insert rows, each in a separate transaction
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# Disable synchronous_commit to make this initialization go faster.
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#
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# Each row contains current insert LSN and the current timestamp, when
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# the row was inserted.
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cur.execute("SET synchronous_commit=off")
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cur.execute("CREATE TABLE foo (x integer)")
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tbl = []
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for i in range(1000):
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cur.execute("INSERT INTO foo VALUES(%s)", (i,))
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# Get the timestamp at UTC
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after_timestamp = query_scalar(cur, "SELECT clock_timestamp()").replace(tzinfo=timezone.utc)
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after_lsn = query_scalar(cur, "SELECT pg_current_wal_lsn()")
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tbl.append([i, after_timestamp, after_lsn])
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time.sleep(0.005)
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# Execute one more transaction with synchronous_commit enabled, to flush
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# all the previous transactions
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cur.execute("SET synchronous_commit=on")
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cur.execute("INSERT INTO foo VALUES (-1)")
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# Wait until WAL is received by pageserver
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last_flush_lsn = wait_for_last_flush_lsn(
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env, endpoint_main, env.initial_tenant, new_timeline_id
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)
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with env.pageserver.http_client() as client:
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# Check edge cases: lsn larger than the last flush lsn
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probe_lsn = Lsn(int(last_flush_lsn) * 20 + 80_000)
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result = client.timeline_get_timestamp_of_lsn(
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env.initial_tenant,
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new_timeline_id,
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probe_lsn,
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)
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# lsn of zero
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try:
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probe_lsn = Lsn(0)
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result = client.timeline_get_timestamp_of_lsn(
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env.initial_tenant,
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new_timeline_id,
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probe_lsn,
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)
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# There should always be an error here.
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raise RuntimeError("there should have been an 'Invalid LSN' error")
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except PageserverApiException as error:
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assert error.status_code == 500
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assert str(error) == "Invalid LSN"
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env.pageserver.allowed_errors.append(".*Invalid LSN.*")
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# small lsn before initdb_lsn
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try:
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probe_lsn = Lsn(64)
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result = client.timeline_get_timestamp_of_lsn(
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env.initial_tenant,
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new_timeline_id,
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probe_lsn,
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)
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# There should always be an error here.
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raise RuntimeError("there should have been an 'could not find data for key' error")
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except PageserverApiException as error:
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assert error.status_code == 500
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assert str(error).startswith("could not find data for key")
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env.pageserver.allowed_errors.append(".*could not find data for key.*")
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# Probe a bunch of timestamps in the valid range
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step_size = 100
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for i in range(step_size, len(tbl), step_size):
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after_timestamp = tbl[i][1]
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after_lsn = tbl[i][2]
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result = client.timeline_get_timestamp_of_lsn(
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env.initial_tenant,
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new_timeline_id,
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after_lsn,
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)
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log.info("result: %s, after_ts: %s", result, after_timestamp)
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# TODO use fromisoformat once we have Python 3.11+
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# which has https://github.com/python/cpython/pull/92177
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timestamp = datetime.strptime(result, "%Y-%m-%dT%H:%M:%S.%f000Z").replace(
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tzinfo=timezone.utc
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)
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assert timestamp < after_timestamp, "after_timestamp after timestamp"
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if i > 1:
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before_timestamp = tbl[i - step_size][1]
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assert timestamp >= before_timestamp, "before_timestamp before timestamp"
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