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seaweedfs/weed
Ping QiuandClaude Opus 4.6 8d6379f841 feat: replica state machine + barrier eligibility gating (CP13-4)
Replaces binary degraded flag with ReplicaState type:
Disconnected, Connecting, CatchingUp, InSync, Degraded, NeedsRebuild.

Ship() allowed from Disconnected (bootstrap: data must flow before
first barrier) and InSync (steady state). Ship does NOT change state.

Barrier() gating:
- InSync: proceed normally
- Disconnected: bootstrap path (connect + barrier)
- Degraded: reconnect both data+ctrl connections, then barrier
- Connecting/CatchingUp/NeedsRebuild: rejected immediately

Only barrier success grants InSync. Reconnect alone does not.

IsDegraded() now means "not sync-eligible" (any non-InSync state).
InSyncCount() added to ShipperGroup.

dist_group_commit.go: removed AllDegraded short-circuit that
prevented bootstrap. Barrier attempts always run — individual
shippers handle their own state-based gating.

8 CP13-4 tests + TestBarrier_RejectsReplicaNotInSync flips FAIL→PASS.
All previously-passing baseline tests remain green.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-25 02:39:32 -07:00
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