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https://issues.apache.org/jira/browse/KAFKA-21318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Quah resolved KAFKA-21318.
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Resolution: Fixed
> invertedTargetAssignment invalid for share groups
> -------------------------------------------------
>
> Key: KAFKA-21318
> URL: https://issues.apache.org/jira/browse/KAFKA-21318
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Sean Quah
> Assignee: Sean Quah
> Priority: Minor
>
> 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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