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Ping QiuandClaude Opus 4.6
47f0111cae
Flusher now holds WAL entries needed by recoverable replicas. Both AdvanceTail (physical space) and checkpointLSN (scan gate) are gated by the minimum flushed LSN across catch-up-eligible replicas. New methods on ShipperGroup: - MinRecoverableFlushedLSN() (uint64, bool): pure read, returns min flushed LSN across InSync/Degraded/Disconnected/CatchingUp replicas with known progress. Excludes NeedsRebuild. - EvaluateRetentionBudgets(timeout): separate mutation step, escalates replicas that exceed walRetentionTimeout (5m default) to NeedsRebuild, releasing their WAL hold. Flusher integration: evaluates budgets then queries floor on each flush cycle. If floor < maxLSN, holds both checkpoint and tail. Extent writes proceed normally (reads work), only WAL reclaim is deferred. LastContactTime on WALShipper: updated on barrier success, handshake success, and catch-up completion. Not on Ship (TCP write only). Avoids misclassifying idle-but-healthy replicas. CP13-6 ships with timeout budget only. walRetentionMaxBytes is deferred (documented as partial slice). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>