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Ping QiuandClaude Opus 4.6
499e244b8e
Barrier response extended from 1-byte status to 9-byte payload carrying the replica's durable WAL progress (FlushedLSN). Updated only after successful fd.Sync(), never on receive/append/send. Replica side: new flushedLSN field on ReplicaReceiver, advanced only in handleBarrier after proven contiguous receipt + sync. max() guard prevents regression. Shipper side: new replicaFlushedLSN (authoritative) replacing ShippedLSN (diagnostic only). Monotonic CAS update from barrier response. hasFlushedProgress flag tracks whether replica supports the extended protocol. ShipperGroup: MinReplicaFlushedLSN() returns (uint64, bool) — minimum across shippers with known progress. (0, false) for empty groups or legacy replicas. Backward compat: 1-byte legacy responses decoded as FlushedLSN=0. Legacy replicas explicitly excluded from sync_all correctness. 7 new tests: roundtrip, backward compat, flush-only-after-sync, not-on-receive, shipper update, monotonicity, group minimum. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>