Kafka - Consumer Groups
You have a Kafka consumer group using cooperative rebalancing but notice long pauses during rebalances. What is a likely cause?
You have a Kafka consumer group using cooperative rebalancing but notice long pauses during rebalances. What is a likely cause?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Check the assignor configuration
If long pauses occur despite expecting cooperative rebalancing, the consumers might be using the eager assignor by mistake.Step 2: Understand the impact of eager assignor
Eager assignor causes all partitions to reassign at once, leading to longer pauses.Final Answer:
Consumers are using the eager assignor instead of cooperative assignor. -> Option CQuick Check:
Long pauses + cooperative expected = eager assignor used [OK]
Quick Trick: Long pauses mean eager assignor, not cooperative [OK]
Common Mistakes:
- Assuming gradual reassignment causes long pauses
- Ignoring assignor configuration
- Blaming rebalance timeout without checking assignor
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