Harden the ring-authority flip and release-gate rehearsal against lost concurrency races - #480
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…ll fails The migrate-first deadline cell failed once in CI (nightly run 33314091717, #434) with the expired compact claim already Retryable at the pre-handoff assert — something rescued it before the current leader existed, and the bare assert_eq destroyed the evidence of which path did. load_job only reports Retryable for a job whose open compact claim is superseded by a deferred_jobs row carrying the same run_lease, so the writer had read the claim ledger; its identity is recoverable from the deferred row's errors and attempt plus any closure outcome. Dump those rows before panicking so the next occurrence is self-diagnosing. No behavior change on the passing path. Claude-Session: https://claude.ai/code/session_019qZh23q9cPPXUtAoPhpfgc
…ock race Reproduced under scripts/repro-rehearsal-contention.sh (1 of 15 full-suite iterations): the binary-first cell's flip_after_released_heartbeats_stale died with SQLSTATE 40P01 — flip_ring_authority's claim_ring_slots update deadlocked against a live claim_ready_runtime call. The cell runs the flip under current traffic on purpose, so losing this race is a designed possibility: PostgreSQL picks a victim, the flip's transaction rolls back whole, and re-running it re-evaluates the refusal gate from scratch. Retry bounded on exactly 40P01 with the same backoff shape migrations::run uses at its atomic boundary (#433); refusals and every other error still fail the cell. Claude-Session: https://claude.ai/code/session_019qZh23q9cPPXUtAoPhpfgc
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📝 WalkthroughWalkthroughThe rolling upgrade rehearsal tests now retry transient deadlocks during authority flips. The deadline-rescue test also reports related job and lease-closure database rows before asserting the claim state. ChangesRolling upgrade rehearsal tests
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The PR only hardens release-gate tests and adds failure diagnostics; production behavior is unchanged. A bounded diagnostics gap remains for one deadline-failure state, so the change is mergeable with explicit owner follow-up. Poem
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In `@awa/tests/rolling_upgrade_rehearsal_test.rs`:
- Line 1053: Update the diagnostic guard around the pending job invariant to
trigger when either pending.state is not JobState::Running or pending.attempt is
not 1, ensuring deferred-row and closure-row diagnostics run for every failed
deadline invariant.
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…ant too The guard fired only on the state mismatch, so a failure of the very next assertion (attempt == 1 while still Running) would panic without the deferred/closure dump. Cover both invariants. Claude-Session: https://claude.ai/code/session_019qZh23q9cPPXUtAoPhpfgc
…race The flip runs while the current fleet keeps claiming — by design — so awa.flip_ring_authority's claim_ring_slots writes can lose a PostgreSQL deadlock cycle (SQLSTATE 40P01) against a concurrent claim_ready_runtime call; the release-gate rehearsal reproduced exactly this under 2-core contention. The server-side function is one atomic transaction, so the detected deadlock rolls back whole and re-running re-evaluates the refusal gate from scratch. storage::flip_ring_authority — behind `awa storage flip-ring-authority` and the maintenance auto-flip — now retries only that error, bounded with the same backoff shape migrations::run uses at its own atomic boundary. Refusals and every other error still return immediately. The signature narrows from a generic executor to &PgPool: every in-repo caller already passed a pool, and the retry needs a re-executable connection source. Claude-Session: https://claude.ai/code/session_019qZh23q9cPPXUtAoPhpfgc
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Validation complete on the widened scope: the 8-iteration full-suite contention soak (all five rehearsal cells, 2-core pinning, released One CI note for the merge decision: the sharded Rust suite runs on PRs only with the Generated by Claude Code |
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Toward a green nightly rehearsal (#434, #427, #383): one production fix at the flip boundary plus two rehearsal-harness changes.
Context
The nightly has been red since Aug 23. Aug 23–29 was the v044 assertion staleness #478 fixed (all five cells,
left: 44, right: 43— confirmed in run 33252304665's logs). The Aug 30 run (33314091717), the first past those assertions, failedtest_migrate_first_deadline_rescue_resumes_with_current_leaderat the pre-handoff assert: the expired compact claim was alreadyRetryable~1s after expiry, before the cell started any current runtime.What this PR does
1.
storage::flip_ring_authorityretries when it loses a deadlock race (production; review feedback).Under
scripts/repro-rehearsal-contention.sh(1 of 15 full-suite iterations), the flip died with SQLSTATE40P01:flip_ring_authority'sclaim_ring_slotswrite deadlocked against a concurrentclaim_ready_runtimecall. The flip runs under live traffic by design; PostgreSQL picks a victim, the flip's single atomic transaction rolls back whole, and re-running re-evaluates the refusal gate from scratch. The wrapper — behindawa storage flip-ring-authorityand the maintenance auto-flip — now retries only40P01, bounded with the same backoff shapemigrations::runadopted at its atomic boundary (#433). Refusals and every other error still return immediately. The signature narrows from a generic executor to&PgPool(every in-repo caller already passed a pool; the retry needs a re-executable connection source). Per review discussion, the test-only 3-arg freshness override stays out of the public API — in operator hands it would flip past a live pre-flip fleet, the exact thing the gate refuses — so the rehearsal's stale-heartbeat helper keeps its raw-SQL variant and applies the same bounded retry around it.2. The rehearsal's stale-heartbeat flip helper retries the same race.
Same policy around the freshness-window variant the tests use; refusals and other errors still fail the cell.
3. Preserve rescue-writer evidence when the deadline cell fails (Aug 30 mode, not yet reproduced).
The failing assert destroyed the evidence of which path rescued the claim. What can be established:
load_jobreportsRetryableover an open compact claim only once adeferred_jobsrow exists for the samerun_lease, so the writer had read the claim ledger — and the released 0.6.3 worker's own sweeps provably cannot (its receipt rescue scans only the row-locallease_claimschildren per the v0.6.3 source; its canonicalUPDATE awa.jobssweep raises0A000under active queue storage). Before failing, the cell now dumps the deferred row (errors/attempt/run_lease), row-local closures, and batch closure outcomes — covering the attempt invariant too, per CodeRabbit — so a recurrence names its writer in the job log. The dump queries were validated against a live schema.Validation
cargo build --workspace,cargo clippy --workspace,cargo fmt --checkclean;test_flip_reconciles_ledgers_and_fences_old_cursor_updatesandtest_flip_gate_blocks_on_fresh_null_version_runtimepass (refusal/force semantics unchanged); a further 8-iteration full-suite contention soak is running and I'll report its result on this PR.awa-pg==0.6.3wheel, matching the release gate's pinned N-1.https://claude.ai/code/session_019qZh23q9cPPXUtAoPhpfgc