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How can you programmatically trigger a rebalance in a Kafka consumer group to test partition assignment changes?

hard📝 Application Q9 of 15
Kafka - Consumer Groups

How can you programmatically trigger a rebalance in a Kafka consumer group to test partition assignment changes?

ABy restarting the Kafka broker
BBy adding or removing a consumer from the group
CBy changing the topic's replication factor
DBy producing more messages to the topic
Step-by-Step Solution
Solution:

  1. Step 1: Identify actions causing rebalance

    Adding or removing consumers triggers group membership change, causing rebalance.

  2. Step 2: Eliminate other options

    Restarting broker or changing replication factor does not trigger consumer group rebalance; producing messages affects data but not assignment.

  3. Final Answer:

    By adding or removing a consumer from the group -> Option B

  4. Quick Check:

    Trigger rebalance = change consumer group membership [OK]
Quick Trick: Change consumer count to trigger rebalance [OK]
Common Mistakes:
  • Restarting broker triggers rebalance
  • Changing replication factor triggers rebalance
  • Producing messages triggers rebalance

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