Your Kafka Consumer Committed — 12,000 Messages Never Arrived
0:01 Kafka consumer offset committed — why the order table stayed empty
2:04 Why Kafka rebalance during processing silently eats uncommitted work
4:17 Kafka offset lag looked normal — 12,000 orders vanished across six hours
6:29 Manual offset commit after write — the pattern that closes the gap
#kafkaconsumermessageslost #kafkaautocommitdataloss #kafkaconsumerlagzerobutmissingmessages
Your Kafka Consumer Committed — 12,000 Messages Never Arrived — kafka consumer messages lost explained with real production examples.
Kafka consumer offset commit can silently lose messages when auto-commit advances past unprocessed batches. This video traces how 12,000 orders vanished from a production pipeline while every monitoring metric showed healthy. We walk through the auto-commit timing gap, the rebalance orphan problem, and why consumer lag fails to detect processing failures. The fix uses manual commitSync after confirmed writes plus a ConsumerRebalanceListener to prevent orphaned batches during partition reassignment.
🔍 Related: kafka consumer losing messages | kafka auto commit vs manual commit | kafka consumer lag zero but data missing | kafka rebalance data loss | enable.auto.commit false example | kafka offset management tutorial | kafka consumer group rebalance fix | kafka messages not processed
📚 What you'll learn in this video:
• Kafka consumer offset committed — why the order table stayed empty
• Why Kafka rebalance during processing silently eats uncommitted work
• Kafka offset lag looked normal — 12,000 orders vanished across six hours
• Manual offset commit after write — the pattern that closes the gap
⏱ Chapters:
0:01 Kafka consumer offset committed — why the order table stayed empty
2:04 Why Kafka rebalance during processing silently eats uncommitted work
4:17 Kafka offset lag looked normal — 12,000 orders vanished across six hours
6:29 Manual offset commit after write — the pattern that closes the gap
💡 Challenge: The auto-commit mechanism in this video led to data loss due to the Kafka consumer lag being zero but messages were still missing. Can you write a 5-line manual offset commit using the commitSync method after processing each message to ensure exactly once delivery, using the Kafka ConsumerRebalanceListener to handle rebalances. Post your solution
👤 Who this is for:
• Developers who work with kafka consumer messages lost in production
• Anyone who has debugged issues that pass all tests but fail in prod
• Engineers who want to write more resilient code
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💬 Join the discussion in the comments!
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📝 Code from this video: https://gist.github.com/morepratikyou...