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Posted to dev@kafka.apache.org by "Sean Quah (Jira)" <ji...@apache.org> on 2026/10/20 09:55:00 UTC

[jira] [Created] (KAFKA-21318) invertedTargetAssignment invalid for share groups

Sean Quah created KAFKA-21318:
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             Summary: invertedTargetAssignment invalid for share groups
                 Key: KAFKA-21318
                 URL: https://issues.apache.org/jira/browse/KAFKA-21318
             Project: Kafka
          Issue Type: Improvement
          Components: group-coordinator
            Reporter: Sean Quah
            Assignee: Sean Quah


In the group coordinator, we maintain `invertedTargetAssignment` for each group as a map of partitions to owning member ids. Then in the assignor `GroupSpec`, we use it to answer `isPartitionAssigned` queries.

Share groups can assign the same partition to multiple members, which breaks tracking of `invertedTargetAssignment`. eg. When a share group member leaves, its assigned partitions can be cleared in `invertedTargetAssignment` and then `isPartitionAssigned` will return `false` for those partitions even when other members still have them assigned.



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