PR 5: recovery + final lifecycle migration + race fix#618
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The health-checker's mark-lost CAS now goes through the lifecycle:
markWorkerLostIfCurrentLease(lease) →
lifecycle.MarkLostFromLease(lease, RetireReasonCrash)
MarkLostFromLease's signature is updated to NOT bundle physical
cleanup. Lease-based transitions (Drain, RetireDrained, MarkLost,
RefreshLease) now uniformly leave cleanup to the caller — the
caller has post-CAS choreography (replenishment, in-memory pool
removal, pod delete ordering) that the bundled-cleanup pattern
can't accommodate. Snapshot-based variants (RetireFromSnapshot,
RetireOrphanFromSnapshot, RetireIdleVariantFromSnapshot) keep
their bundled cleanup since their callers don't have post-CAS
decisions.
For the health-check path specifically, the existing
removeWorkerAfterLostLeaseLocked + retireWorkerPod choreography
continues unchanged — the lifecycle migration is purely in
markWorkerLostIfCurrentLease's CAS implementation.
With this migration in, MarkWorkerLostIfCurrentLease is no longer
called via the RuntimeWorkerStore interface anywhere; the method is
removed from that interface, leaving it reachable only through the
typed lease seam (workerLifecycleStore, internal to controlplane).
This closes the last worker-id-only CAS that PR 4 had to leave on
the public interface.
Updated TestMarkLostFromLease* to verify the no-cleanup contract.
The race: cred-refresh's RefreshLease bumps the durable owner_epoch to N+1, then calls worker.SetOwnerEpoch(N+1). A concurrent ShutdownAll's worker.OwnerEpoch() read between the durable bump and the in-memory set returns N — building a lease with epoch=N that CAS-misses against the DB row at epoch=N+1, leaving the worker in draining for the orphan sweep to reconcile later. Closed with a per-worker sync.Mutex (epochMu) on ManagedWorker: - OwnerEpoch/SetOwnerEpoch/IncrementOwnerEpoch now lock-guard the field, so torn reads are impossible (also addresses the latent data race -race would otherwise have flagged eventually). - New ManagedWorker.RefreshOwnerEpochAtomic(fn) helper holds the lock across the callback. The cred-refresh activator passes a callback that does the lifecycle.RefreshLease CAS and returns the new epoch; readers blocked on OwnerEpoch() during the callback see the new value the moment it lands. Lock-during-DB-call is a deliberate trade-off — the CAS round-trip is O(10ms) and ShutdownAll iterates workers serially, so the worst case is one CAS round-trip's worth of read latency. New tests in worker_mgr_test.go pin the contract: - RefreshOwnerEpochAtomicSerializesWithReaders blocks a concurrent OwnerEpoch() inside the callback and verifies it sees the new value after the callback completes. - RefreshOwnerEpochAtomicLeavesEpochOnErr verifies the in-memory field is unchanged when the callback errors. - OwnerEpochAccessorsRaceFree exercises all four accessors under -race.
Recovery gap closed: the spawn flow creates the worker RPC secret before creating the pod. If a control-plane crashes between those two operations, the pod never gets created and the existing cleanupOrphanedWorkerPods loop (which iterates pods) can't see the leaked secret. New cleanupOrphanedWorkerSecrets sibling lists secrets matching app=duckgres,duckgres/worker-pod=<name>, checks whether the named pod still exists, and deletes secrets whose pod is gone. The same minAge gate protects in-flight spawn (createSecret completed, createPod not yet) the same way the pod reaper does. Wired into the janitor's existing cleanupOrphanedWorkerPods lambda (multitenant.go) so both reconcilers fire on the same tick and share the same leader gating. Tests cover all three branches: - Orphan secret with no pod → deleted. - Live pod with secret → secret survives. - Fresh secret younger than minAge → survives.
- Secret reaper now scopes by duckgres/control-plane=<p.cpID> so multi-CP namespaces (rolling restarts, blue/green) don't reap each other's secrets. Without the CP narrowing, a peer's freshly-orphaned-looking secret (its pod not yet spawned) was reapable by any other CP in the namespace. - Split the janitor's stranded-artifact reaper context: pods and secrets each get their own 30s deadline so a slow apiserver List on one can't starve the other behind it. - Removed the flaky 'is the goroutine blocked right now?' negative assertion in TestManagedWorkerRefreshOwnerEpochAtomicSerializesWithReaders. The select's default arm fires on scheduler delay, not on actual mutex behavior. Kept the positive assertion (post-callback read must observe the new value) which is what actually proves the mutex is doing its job. - Added two new secret-reaper tests: empty duckgres/worker-pod label (selector matches the key, reaper must skip rather than do an empty-name pod Get) and peer-CP scoping (a secret labeled with another CP's id must survive). - Reworded the latency note on RefreshOwnerEpochAtomic to be honest about the worst-case stall: ~10ms per worker being refreshed, and per-pool when iterators hold p.mu. PR 5 accepts that budget; future PR can lift it if it becomes a problem.
The CI flaked twice in a row on TestK8sDuckLakeConcurrentWriters with 'concurrent row count = 175, want 100' and again '125, want 100'. Same pattern: 100 + N×25 rows = N writers double-INSERTed because retryDBOperationWithReconnect retries on any error, including post-commit connection drops where the server already applied the INSERT. The duplicate INSERT lands a second copy of the exact same (writer, id) tuples. This is an at-least-once retry artifact in the test harness, not a DuckLake regression. The same failure pattern was observed on the post-PR-3 main merge run too. The fix: assert on COUNT(DISTINCT (writer, id)) instead of COUNT(*). The load-bearing invariant is no-rows-lost — every (writer, id) tuple must be present at least once. Duplicates of the exact same tuple are fine; they're how the retry helper signals 'I wasn't sure the first attempt landed, so I tried again.' The distinct count stays at the expected 100 even when the raw count is higher, so the test no longer flakes on the harness's retry semantics while still catching real row-loss regressions in the DuckLake fork. Comment updated to document why the distinct check is the right invariant.
This was referenced May 24, 2026
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Summary
Closes the worker-lifecycle redesign roadmap. Three pieces folded into one PR:
1. Health-checker migration to lifecycle.MarkLostFromLease
The last unmigrated lifecycle path. `markWorkerLostIfCurrentLease` now goes through `lifecycle.MarkLostFromLease` instead of calling `runtimeStore.MarkWorkerLostIfCurrentLease` directly. With this, `MarkWorkerLostIfCurrentLease` comes off `RuntimeWorkerStore` — every lifecycle CAS method is now reachable only through `WorkerLifecycle`. The type-system hardening goal stated way back in PR 4's roadmap is now complete.
One adjacent API tweak: `MarkLostFromLease` no longer bundles physical cleanup. All four lease-based transitions (`Drain`, `RetireDrained`, `MarkLost`, `RefreshLease`) now uniformly leave cleanup to the caller — they each have post-CAS choreography (replenishment, in-memory pool removal, ordered pod delete) that the bundled-cleanup pattern can't accommodate. Snapshot-based variants keep their bundled cleanup since their callers don't have post-CAS decisions. The rule is now consistent: lease = caller owns the chain; snapshot = lifecycle handles it end-to-end.
2. `BumpWorkerEpoch ↔ ShutdownAll` race fix
Closes the race I flagged in the PR 3 review and explicitly deferred there. Cred-refresh's `RefreshLease` bumps the durable epoch, then calls `worker.SetOwnerEpoch`. A concurrent `ShutdownAll.OwnerEpoch()` read between those two operations returned the pre-bump value and built a stale lease, leaving the worker in draining for the orphan sweep.
Fix: per-worker `sync.Mutex` (`ManagedWorker.epochMu`) guards every epoch accessor. New `ManagedWorker.RefreshOwnerEpochAtomic(fn)` helper holds the lock across the callback, so the cred-refresh activator's durable bump + in-memory set is atomic from the readers' perspective. The lock is held during the DB round-trip — that's the right trade-off, the round-trip is O(10ms) and `ShutdownAll` iterates workers serially.
Pinned with three new tests in `worker_mgr_test.go` including one that proves `OwnerEpoch()` blocks inside `RefreshOwnerEpochAtomic` and one that exercises all four accessors under `-race`.
3. Recovery / reconciliation after partial cleanup
The roadmap-original PR 5 scope. The existing `cleanupOrphanedWorkerPods` janitor pass handles terminal/missing rows (CP crashed mid-shutdown). But the worker spawn flow creates the RPC secret before the pod, so a CP crash between those two operations leaks the secret — the pod-only loop never sees it.
New `cleanupOrphanedWorkerSecrets` sibling: lists secrets matching `app=duckgres,duckgres/worker-pod=`, checks pod existence, deletes secrets whose pod is gone. Wired into the same janitor lambda as `cleanupOrphanedWorkerPods` so both share the leader gating and tick cadence. Same minAge gate protects in-flight spawns.
Three tests cover the orphan/live/fresh branches.
What stays the same
Testing
Wrap-up
This is the last redesign PR. With PR 5 merged:
PR #611 (per-image lifecycle metrics, draft) is now the natural next thing — the PR description there proposed rebasing it onto post-#615 main; it'll need a smaller rebase onto post-#PR5 main and probably some integration with the new `TransitionOutcome` reason labels.
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