84 lines
3.5 KiB
Markdown
84 lines
3.5 KiB
Markdown
---
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id: pg-fix-scheduler-error-classification
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name: Classify run_schedules' renew-failure arms on pg (the sqlite twin, review 004 item 9)
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status: pending
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depends_on: []
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scope: narrow
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risk: low
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impact: component
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level: implementation
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tags: [review-004-fixes, postgres-engine, scheduler]
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---
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## Description
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The pg twin of `sqlite-fix-scheduler-error-classification` (completed),
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recorded in that task's Notes as an unresolved follow-up:
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`alkstore-postgres/src/scheduler.rs:682` carries the identical
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`.unwrap_or(false)` flattening the sqlite task fixed — a mid-run
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`lease.renew(LEADER_TTL_S)` failure (including the closed-store
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`Database` error) is mapped to `false` and misreported as
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`Error::LeadershipLost`, misdirecting the documented respawn recipe at
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a dead store.
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The classification decision of record is already landed and
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engine-neutral — the sqlite task's dated (2026-10-11) ADR-009 §1 /
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core-contract.md §Errors annotation pins the arm set for the family —
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so this task implements pg to match it, not re-decides:
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- `renew` → `Ok(false)` — the genuine loss arm (expired and
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re-acquired elsewhere; exclusion lapses silently at TTL expiry,
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ADR-008 §7) — returns `Err(LeadershipLost)`, unchanged,
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return-before-tick. The respawn recipe matches on this arm only.
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- `renew` → `Err(e)` — the machinery never reached the lock
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semantics; not a loss, never `LeadershipLost`. The `Err` propagates
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unchanged: the closed-store arm arrives pre-classified (pg's
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post-close `renew` fails closed with `Database`, pinned by pg
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lock_tests), and any other storage failure carries the driver's
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source chain.
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No new variant minted — ADR-008 §5's act-differently rule holds
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(`Closed` stays the wake-receiver variant; closed store is `Database`
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engine-wide, the pg posture already).
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**Tests need the harness server** (the reason the sqlite task recorded
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rather than landed this): model the two pins on the sqlite task's —
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a mid-run close exits with the closed `Database` classification, never
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`LeadershipLost`; a mid-run lease loss still returns `LeadershipLost`
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(the respawn arm unchanged).
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## Acceptance Criteria
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- [ ] The pg renew arm implements the landed arm set: `Ok(false)` →
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`LeadershipLost` unchanged; `Err(e)` propagates unchanged (no
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flattening) — no re-deciding; any discrepancy with the sqlite
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task's decisions of record recorded, not deviated around
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- [ ] Both arms pinned by tests against the harness server (the
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closed-store arm and the genuine-loss arm, modeled on the
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sqlite task's two pins)
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- [ ] The ADR-009 §1 / core-contract annotations verified to read
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engine-neutral (they were landed as family-wide; cite them —
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only pg-specific doc text needs touching, e.g.
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engine-postgres.md's scheduler row if it describes the arm)
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- [ ] `cargo test -p alkstore-postgres` (harness server), clippy
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`-D warnings`, fmt clean; workspace gates green server-less
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## References
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- tasks/sqlite-fix-scheduler-error-classification.md (the twin — the
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arm set's decisions of record, the two pin shapes, the recorded
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follow-up this task discharges)
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- docs/reviews/004-pre-release-general-review.md §"Findings recorded,
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not fixed" item 9 (the original finding — recorded the sqlite site
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only; the pg twin surfaced at implementation)
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- docs/architecture/decisions/009-*.md §1 (the dated classification
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annotation of record), core-contract.md §Errors
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- alkstore-postgres/src/scheduler.rs:675-690 (the flattening site)
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## Notes
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> To be filled by implementation agent
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## Summary
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> To be filled on completion |