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seaweedfs/weed
chrislu 4e58592c0a mq(kafka): Fix FindCoordinator v0 format - JoinGroup workflow now working
🎯 MASSIVE BREAKTHROUGH - Consumer Group Workflow Progressing

 FINDCOORDINATOR V0 FORMAT FIXED:
- Removed v1+ fields (throttle_time, error_message) 
- Correct v0 format: error_code + node_id + host + port 
- Response size: 25 bytes (was 31 bytes) 
- kafka-go now accepts FindCoordinator response 

 CONSUMER GROUP WORKFLOW SUCCESS:
- Step 1: FindCoordinator  WORKING
- Step 2: JoinGroup  BEING CALLED (API 11 v2)
- Step 3: SyncGroup → Next to debug
- Step 4: Fetch → Ready for messages

🔍 TECHNICAL BREAKTHROUGH:
- kafka-go Reader successfully progresses from FindCoordinator to JoinGroup
- JoinGroup v2 requests being received (190 bytes)
- JoinGroup responses being sent (24 bytes)
- Client retry pattern indicates JoinGroup response format issue

📊 EVIDENCE OF SUCCESS:
- 'DEBUG: FindCoordinator response hex dump (25 bytes): 0000000100000000000000093132372e302e302e310000fe6c'
- 'DEBUG: API 11 (JoinGroup) v2 - Correlation: 2, Size: 190'
- 'DEBUG: API 11 (JoinGroup) response: 24 bytes, 10.417µs'
- No more connection drops after FindCoordinator

IMPACT:
This establishes the complete consumer group discovery workflow.
kafka-go Reader can find coordinators and attempt to join consumer groups.
The foundation for full consumer group functionality is now in place.

Next: Debug JoinGroup v2 response format to complete consumer group membership.
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