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docs(deploy): degraded-rebuild repair + node-side reason write (#601 review)

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Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
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Joseph Doherty
2026-10-08 17:50:27 -04:00
parent 345f40550b
commit af02fce3c4
1 changed files with 6 additions and 1 deletions
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docs/Redundancy.md
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@@ -616,7 +616,12 @@ deployment green fleet-wide. Now:
- **Re-deploying a degraded revision repairs it.** The node's idempotent "already at this revision" short- - **Re-deploying a degraded revision repairs it.** The node's idempotent "already at this revision" short-
circuit is skipped while the current revision's apply is degraded or its outcome is still pending — the circuit is skipped while the current revision's apply is degraded or its outcome is still pending — the
dispatch re-applies instead, the publish actor re-diffs the un-advanced composition and re-ensures the dispatch re-applies instead, the publish actor re-diffs the un-advanced composition and re-ensures the
missing nodes, and the ack reports the new outcome. missing nodes, and the ack reports the new outcome. A degraded **rebuild** is the other shape: it DOES
advance `_lastApplied`, so the identical re-deploy diffs to an empty plan — the publish actor remembers
that the last advance was degraded and, on that empty plan, re-ensures the whole composition (idempotent,
no second rebuild), reporting clean only if that pass is clean.
- **A node with a ConfigDb also writes the reason on its own row** (`ApplyAck.DegradedReasonPrefix`), because
central only records it when it *accepts* the ack — a timed-out deployment's late ack is discarded.
- **Mixed-version fleets.** An old node never sets the flag, so its acks are treated exactly as before - **Mixed-version fleets.** An old node never sets the flag, so its acks are treated exactly as before
(clean). A new node acking an old central: the old coordinator ignores the unknown field and seals as it (clean). A new node acking an old central: the old coordinator ignores the unknown field and seals as it
always did — no worse than today. always did — no worse than today.