myxce/.kiro/specs/ha-convergence-recovery
Rongsong Shen 40f510fb14 fix(controller): bug-1433 async-thread fdatasync block + bug-1434 committed_lsn CAS race
bug-1433: raft_cb_become_leader runs synchronously off peer_ctrl_dispatch_to_pool,
which hardcodes VTASK_LIVENESS for every inbound peer-control packet including
vote replies. The bug-1431 round-2 fix (flusher_flush_once force-flush in
persist_promotion_advance_committed) was reachable from that never-blocks task
class -- same bug family as bug-1198. Removed the force-flush; round-3
(durable-capped only) plus the already-shipped bug-1432 immediate-first-heartbeat
fix close the visibility-latency gap non-blockingly. TRACKED RESIDUAL:
persist_apply_pump_run_sync is still reachable on the same VTASK_LIVENESS path
and does bounded pread() -- lower risk (page-cache-hot) but strictly still
blocking I/O; not safe to remove outright (reopens bug-1043-family job loss),
needs its own follow-up (reclassify peer_ctrl_classify's winning-vote-reply case
or dispatch promotion tail onto a fresh VTASK_LIVE_BLOCK vtask).

bug-1434: persist_promotion_advance_committed and ha_standby_advance_committed_and_apply
raced on persist_t.committed_lsn via an unlocked load-then-conditional-store during
the promotion window (before ha->role flips to CTRL_PRIMARY) -- a losing racer could
regress committed_lsn. Added persist_committed_lsn_advance_atomic (CAS retry loop,
lock-free) and routed both call sites through it.

Validated: 19/19 unit test suites, 6-round chaotic soak (0 loss/divergence) + 6-round
sequential+leadership-coverage soak, both PASS. Also folds in raft-apply-decoupling
and raft-ha-core-safety validate-impl phase bumps to "implemented" and clears
config-upgrade-snapshot's now-satisfied entity-bearing-snapshots block.
2026-07-11 12:16:28 +00:00
..
brief.md chore: baseline snapshot — prior-session work + ha-consistency-invariants spec family 2026-06-11 13:21:50 +00:00
design.md chore: baseline snapshot — prior-session work + ha-consistency-invariants spec family 2026-06-11 13:21:50 +00:00
requirements.md fix(controller): bug-1433 async-thread fdatasync block + bug-1434 committed_lsn CAS race 2026-07-11 12:16:28 +00:00
research.md docs(specs): gap re-validation 2026-06-24 (5 HA/raft specs) 2026-06-24 10:04:06 +00:00
spec.json docs: close ha-consistency-invariants umbrella spec 2026-07-03 03:23:53 +00:00
tasks.md test(ha-convergence-recovery): close Task 8 — live /xce-test-ha 8-round PASS 2026-06-24 10:17:11 +00:00