Kafka - Monitoring and Operations
You notice the lag value is always zero but consumers are not processing messages. What could be the problem?
You notice the lag value is always zero but consumers are not processing messages. What could be the problem?
medium📝 Troubleshoot Q7 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand zero lag with no processing
If consumers do not commit offsets (auto-commit disabled), lag may show zero because Kafka thinks no messages are consumed yet.Step 2: Exclude other causes
Topic with no messages means no lag but also no processing needed; wrong group ID would show no data; broker overload causes delays but not zero lag.Final Answer:
Consumers have auto-commit disabled and have not committed offsets -> Option BQuick Check:
Zero lag but no processing = no offset commits [OK]
Quick Trick: Lag zero can mean no offset commits [OK]
Common Mistakes:
MISTAKES- Assuming zero lag means consumers are working
- Confusing group ID errors with lag display
- Blaming broker overload for zero lag
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