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feat(ha-commit-engine): per-LSN majority commit engine core (task 1.2)

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commit_on_ack: active-standby (non-catch-up, connected) watermark scan,
descending sort, candidate arr[n_peers/2-1], clamped to appended log,
monotonic single-site committed_lsn store, condvar broadcast, never
blocks beyond engine mutex. RETAIN returns immediately. Self-quorum for
n_peers<=1; zero-fill makes zero-standby commit impossible. 7/7 task-1.1
tests green unmodified; full suite at known 3-failure baseline.
This commit is contained in:
Rongsong Shen 2026-06-11 14:37:01 +00:00
parent d5a0f9c64d
commit eae4767d7d
4 changed files with 203 additions and 23 deletions
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.wolf/anatomy.md
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# anatomy.md
> Auto-maintained by OpenWolf. Last scanned: 2026-06-11T14:16:52.677Z
> Auto-maintained by OpenWolf. Last scanned: 2026-06-11T14:36:56.598Z
> Files: 511 tracked | Anatomy hits: 0 | Misses: 0
## ./
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## src/controller/
- `commit.c` — STUB commit engine (ha-commit-engine task 1.1 RED): init/fini real, commit_submit -ENOSYS, commit_on_ack no-op; real impl in task 1.2 (~474 tok)
- `commit.c` — Commit engine core (ha-commit-engine 1.2): per-LSN majority evaluation (descending watermark median arr[n_peers/2-1], catch-up excluded), monotonic clamped committed_lsn advancement, RETAIN submit immediate; WAIT = -ENOSYS until task 2.2 (~2600 tok)
- `meson.build` (~1094 tok)
## src/controller/include/

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.wolf/memory.md
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| 13:30 | Task 1.1 ha-commit-engine RED: commit.h + stub commit.c + test_commit_engine.c (7 failing tests) | src/controller/{include/commit.h,commit.c,testsuite/test_commit_engine.c,meson.build,testsuite/controller_test.c} | 7/7 RED for right reasons; 3 suite failures proven pre-existing via baseline stash run | ~60k |
| 07:16 | Edited .kiro/specs/ha-commit-engine/tasks.md | inline fix | ~23 |
| 07:16 | Edited .kiro/specs/ha-commit-engine/tasks.md | modified now() | ~344 |
| 07:22 | Created src/controller/commit.c | — | ~2108 |
| 2026-06-11 | ha-commit-engine task 1.2: implemented commit engine core (majority median, monotonic clamped committed_lsn, RETAIN) — 7/7 tests green | src/controller/commit.c | success | ~9k |
| 07:36 | Edited .kiro/specs/ha-commit-engine/tasks.md | inline fix | ~14 |