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chrislu
f66960e445
Phase 4: Server-Side Debugging Infrastructure
Added detailed logging for every fetch request lifecycle on server:
- FETCH_START: Logs request details (offset, maxBytes, correlationID)
- FETCH_END: Logs result (empty/data), HWM, duration
- ERROR tracking: Marks critical errors (HWM failure, double fallback failure)
- Timeout detection: Warns when result channel times out (client disconnect?)
- Fallback logging: Tracks when multi-batch fails and single-batch succeeds
Changes:
- fetch_partition_reader.go: Added FETCH_START/END logging
- Detailed error logging for both multi-batch and fallback paths
- Enhanced timeout detection with client disconnect warning
Test Results - BREAKTHROUGH:
BEFORE: 87.5% delivery (1974-2055/2350-2349)
AFTER: 92% delivery (2163/2350) 🚀
IMPROVEMENT: +4.5 percentage points!
Remaining missing: 187 messages (8%)
Down from: 12.5% in previous session!
Pattern Evolution:
0% → 45% → 71% → 87.5% → 92% (!)
Key Observation:
- Just adding server-side logging improved delivery by 4.5%!
- This further confirms presence of timing/race condition
- Server-side logs will help identify why stream closes
Next: Examine server logs to find why 8% of partitions don't consume all messages