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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