Files
neon/control_plane
John Spray 7e4280955e control_plane/attachment_service: improve Scheduler (#6633)
## Problem

One of the major shortcuts in the initial version of this code was to
construct a fresh `Scheduler` each time we need it, which is an O(N^2)
cost as the tenant count increases.

## Summary of changes

- Keep `Scheduler` alive through the lifetime of ServiceState
- Use `IntentState` as a reference tracking helper, updating Scheduler
refcounts as nodes are added/removed from the intent.

There is an automated test that checks things don't get pathologically
slow with thousands of shards, but it's not included in this PR because
tests that implicitly test the runner node performance take some thought
to stabilize/land in CI.
2024-02-19 14:12:20 +00:00
..