[jira] [Created] (KAFKA-20909) Consider bumping the consumer group epoch when a member's rack ID changes

["sanghyeok An (Jira)" <ji...@apache.org>]

sanghyeok An created KAFKA-20909:
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             Summary: Consider bumping the consumer group epoch when a member's rack ID changes
                 Key: KAFKA-20909
                 URL: https://issues.apache.org/jira/browse/KAFKA-20909
             Project: Kafka
          Issue Type: Improvement
            Reporter: sanghyeok An
            Assignee: sanghyeok An


In KIP-848 consumer groups, a member's changed rack ID is persisted, but it does not currently bump the group epoch. Therefore, the target assignment is not recomputed until another event triggers a rebalance.

This is relevant to static members as well. A member rejoining with the same group.instance.id retains its logical identity, but its previous assignment may no longer be appropriate if its rack has changed.

Rack ID is also included in the member metadata passed to the assignor. A custom or future rack-aware assignor may produce a different assignment based on it.

Consider treating an effective rack ID change as an assignment-relevant metadata change and bumping the group epoch. An omitted or unchanged rack ID should not trigger a bump.



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