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chore: baseline snapshot — prior-session work + ha-consistency-invariants spec family

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Pre-existing uncommitted work: ha-repl-hardening payload data plane (7.x),
heartbeat liveness fix (Req 1.3), connection-reuse ASAN fixes, doc cleanup.
New: ha-consistency-invariants umbrella (requirements/design/research) and
its four implementation sub-specs (specs generated via batch, cross-spec
review applied), steering roadmap + product.md Raft+CP decision.
This commit is contained in:
Rongsong Shen 2026-06-11 13:21:50 +00:00
parent 084244941b
commit 06135954ff
88 changed files with 25611 additions and 5285 deletions
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9
src/controller/persist.c
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@ -1038,7 +1038,14 @@ int persist_wal_sync_append(persist_t* p, uint32_t type,
}
if (sync_rc_out)
*sync_rc_out = sync_err;
/* sync_err < 0 = degraded mode (local-only durability); continue operating. */
/* sync_err < 0 — replication failed.
* -ENODEV: no standbys registered (single-node or degraded).
* -ETIMEDOUT: standbys were registered but didn't ACK in time.
* Only -ENODEV is acceptable for forward progress; timeout means
* the cluster had standbys but couldn't reach quorum — the write
* must be rejected to preserve the majority-consistency invariant. */
if (sync_err == -ETIMEDOUT)
return -ETIMEDOUT;
return 0;
}