Kafka - Monitoring and Operations
Why might consumer lag sometimes show zero even when consumers are not processing messages?
Why might consumer lag sometimes show zero even when consumers are not processing messages?
hard🧠 Conceptual Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand lag calculation
Lag is the difference between the latest offset and the last committed offset by the consumer group.Step 2: Explain zero lag with no processing
If consumers do not commit offsets frequently, lag may appear zero even if messages are unprocessed.Final Answer:
Because lag is calculated based on committed offsets, and consumers may not commit offsets immediately -> Option BQuick Check:
Lag zero can hide uncommitted processing [OK]
Quick Trick: Lag depends on committed offsets, not real-time processing [OK]
Common Mistakes:
MISTAKES- Believing Kafka resets lag periodically
- Thinking partition count affects lag zero
- Assuming invalid group ID causes zero lag
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