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https://issues.apache.org/jira/browse/KAFKA-19449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-19449.
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Fix Version/s: 4.2.0
4.0.2
4.1.2
Resolution: Fixed
> Unexpected UNREVOKED_PARTITIONS to UNRELEASED_PARTITIONS transition in
> consumer member reconciliation
> -----------------------------------------------------------------------------------------------------
>
> Key: KAFKA-19449
> URL: https://issues.apache.org/jira/browse/KAFKA-19449
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Sean Quah
> Assignee: Sean Quah
> Priority: Minor
> Fix For: 4.2.0, 4.0.2, 4.1.2
>
>
> We transition to `UNRELEASED_PARTITIONS` when advancing to a new target
> assignment and partitions in the assignment are "owned" by another member.
> Partitions are considered "owned" by another member if they are in a member's
> assignment or partitions pending revocation. Ownership is only updated after
> reconciliation has finished.
> When the latest target assignment includes partitions from the partitions
> pending revocation list, we mistakenly think the partitions are owned by
> another member and can transition from `UNREVOKED_PARTITIONS` to
> `UNRELEASED_PARTITIONS` instead.
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