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## Problem Image compaction can starve out L0 compaction if a tenant has several timelines with L0 debt. Touches #10694. Requires #10740. ## Summary of changes * Add an initial L0 compaction pass, in order of L0 count. * Add a tenant option `compaction_l0_first` to control the L0 pass (disabled by default). * Add `CompactFlags::OnlyL0Compaction` to run an L0-only compaction pass. * Clean up the compaction iteration logic. A later PR will use separate semaphores for the L0 and image compaction passes to avoid cross-tenant L0 starvation. That PR will also make image compaction yield if _any_ of the tenant's timelines have pending L0 compaction to further avoid starvation.
Local Development Control Plane (neon_local)
This crate contains tools to start a Neon development environment locally. This utility can be used with the cargo neon command. This is a convenience to invoke
the neon_local binary.
Note: this is a dev/test tool -- a minimal control plane suitable for testing code changes locally, but not suitable for running production systems.
Example: Start with Postgres 16
To create and start a local development environment with Postgres 16, you will need to provide --pg-version flag to 3 of the start-up commands.
cargo neon init --pg-version 16
cargo neon start
cargo neon tenant create --set-default --pg-version 16
cargo neon endpoint create main --pg-version 16
cargo neon endpoint start main
Example: Create Test User and Database
By default, cargo neon starts an endpoint with cloud_admin and postgres database. If you want to have a role and a database similar to what we have on the cloud service, you can do it with the following commands when starting an endpoint.
cargo neon endpoint create main --pg-version 16 --update-catalog true
cargo neon endpoint start main --create-test-user true
The first command creates neon_superuser and necessary roles. The second command creates test user and neondb database. You will see a connection string that connects you to the test user after running the second command.