In a Kafka consumer group using cooperative rebalancing, what is the expected behavior when a consumer leaves?

medium📝 Predict Output Q5 of 15

Kafka - Consumer Groups

AOnly partitions assigned to the leaving consumer are revoked and reassigned.

BAll partitions in the group are revoked and reassigned to remaining consumers.

CThe group pauses consumption until a manual restart.

DPartitions assigned to the leaving consumer remain unassigned.

Step-by-Step Solution

Solution:

Step 1: Analyze cooperative rebalancing on consumer leave
Cooperative rebalancing revokes only the partitions of the leaving consumer and reassigns them incrementally.
Step 2: Eliminate other options
Full revocation is eager behavior; pausing or leaving partitions unassigned is incorrect.
Final Answer:
Only partitions assigned to the leaving consumer are revoked and reassigned. -> Option A
Quick Check:
Cooperative rebalance on leave = C [OK]

Quick Trick: Cooperative rebalance revokes only leaving consumer's partitions [OK]

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