Files
neon/control_plane
John Spray 4f7704af24 storage controller: fix spurious reconciles after pageserver restarts (#6814)
## Problem

When investigating test failures
(https://github.com/neondatabase/neon/issues/6813) I noticed we were
doing a bunch of Reconciler runs right after splitting a tenant.

It's because the splitting test does a pageserver restart, and there was
a bug in /re-attach handling, where we would update the generation
correctly in the database and intent state, but not observed state,
thereby triggering a reconciliation on the next call to maybe_reconcile.
This didn't break anything profound (underlying rules about generations
were respected), but caused the storage controller to do an un-needed
extra round of bumping the generation and reconciling.

## Summary of changes

- Start adding metrics to the storage controller
- Assert on the number of reconciles done in test_sharding_split_smoke
- Fix /re-attach to update `observed` such that we don't spuriously
re-reconcile tenants.
2024-02-19 17:44:20 +00:00
..