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Ping QiuandClaude Opus 4.6
548e47e482
Adds the sync_all reconnect protocol: when a degraded shipper reconnects, it performs a handshake (ResumeShipReq/Resp) to determine the replica's durable progress, then streams missed WAL entries to close the gap before resuming live shipping. New wire messages: - MsgResumeShipReq (0x03): primary sends epoch, headLSN, retainStart - MsgResumeShipResp (0x04): replica returns status + flushedLSN - MsgCatchupDone (0x05): marks end of catch-up stream Decision matrix after handshake: - R == H: already caught up → InSync - S <= R+1 <= H: recoverable gap → CatchingUp → stream → InSync - R+1 < S: gap exceeds retained WAL → NeedsRebuild - R > H: impossible progress → NeedsRebuild WALAccess interface: narrow abstraction (RetainedRange + StreamEntries) avoids coupling shipper to raw WAL internals. Bootstrap vs reconnect split: fresh shippers (HasFlushedProgress=false) use CP13-4 bootstrap path. Previously-synced shippers use handshake. Catch-up retry budget: maxCatchupRetries=3 before NeedsRebuild. ReplicaReceiver now initializes receivedLSN/flushedLSN from volume's nextLSN on construction (handles receiver restart on existing volume). TestBug2_SyncAll_SyncCache_AfterDegradedShipperRecovers flips FAIL→PASS. All previously-passing baseline tests remain green. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>