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				dev
			
				helm-3.65.1
			
				v0.69
			
				v0.70beta
			
				v3.33
			
		${ noResults }
		seaweedfs/test/kafka/kafka-client-loadtest/cmd/loadtest
			
			
			| Phase 12: ROOT CAUSE FOUND - Duplicates due to Topic Persistence Bug
Duplicate Analysis:
  - 8104 duplicates (66.5%), ALL read exactly 2 times
  - Suggests single rebalance/restart event
  - Duplicates start at offset 0, go to ~800 (50% of data)
Investigation Results:
  1. Offset commits ARE working (logging shows commits every 20 msgs)
  2. NO rebalance during normal operation (only 10 OFFSET_FETCH at start)
  3. Consumer error logs show REPEATED failures:
     'Request was for a topic or partition that does not exist'
  4. Broker logs show: 'no entry is found in filer store' for topic-2
Root Cause:
  Auto-created topics are NOT being reliably persisted to filer!
  - Producer auto-creates topic-2
  - Topic config NOT saved to filer
  - Consumer tries to fetch metadata → broker says 'doesn't exist'
  - Consumer group errors → Sarama triggers rebalance
  - During rebalance, OffsetFetch returns -1 (no offset found)
  - Consumer starts from offset 0 again → DUPLICATES!
The Flow:
  1. Consumers start, read 0-800, commit offsets
  2. Consumer tries to fetch metadata for topic-2
  3. Broker can't find topic config in filer
  4. Consumer group crashes/rebalances
  5. OffsetFetch during rebalance returns -1
  6. Consumers restart from offset 0 → re-read 0-800
  7. Then continue from 800-1600 → 66% duplicates
Next Fix:
  Ensure topic auto-creation RELIABLY persists config to filer
  before returning success to producers. | 2 weeks ago | |
|---|---|---|
| .. | ||
| main.go | fix Node ID Mismatch, and clean up log messages | 2 weeks ago |