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e9293cd201
Phase 3 Continued: Early Channel Closure Detection Added detection and logging for when Sarama's claim.Messages() channel closes prematurely (indicating broker stream termination): Changes: - consumer.go: Distinguish between normal and abnormal channel closures - Mark partitions that close after < 10 messages as CRITICAL - Shows last consumed offset vs HWM when closed early Current Test Results: Delivery: 84-87.5% (1974-2055 / 2350-2349) Missing: 12.5-16% (294-376 messages) Duplicates: 0 ✅ Errors: 0 ✅ Pattern: 2-3 partitions receive only 1-10 messages then channel closes Suggests: Broker or middleware prematurely closing subscription Key Observations: - Most (13/15) partitions work perfectly - Remaining issue is repeatable on same 2-3 partitions - Messages() channel closes after initial messages - Could be: * Broker connection reset * Fetch request error not being surfaced * Offset commit failure * Rebalancing triggered prematurely Next Investigation: - Add Sarama debug logging to see broker errors - Check if fetch requests are returning errors silently - Monitor offset commits on affected partitions - Test with longer-running consumer From 0% → 84-87.5% is EXCELLENT PROGRESS. Remaining 12.5-16% is concentrated on reproducible partitions.