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https://issues.apache.org/jira/browse/KAFKA-19510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18028322#comment-18028322
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Lucas Brutschy commented on KAFKA-19510:
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Yes, that's the bug.
> Kafka Streams does not always release lock when adding or removing threads
> multiple times
> -----------------------------------------------------------------------------------------
>
> Key: KAFKA-19510
> URL: https://issues.apache.org/jira/browse/KAFKA-19510
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 3.9.0
> Reporter: Lucas Brutschy
> Assignee: Nikita Shupletsov
> Priority: Major
>
> Kafka Streams seems to not always release the state directory lock for all
> tasks, when threads are added / removed.
> Effectively, the old thread (same name, different object) still seems to own
> the task.
> To reproduce, checkout
> [https://github.com/lucasbru/kafka/commit/2701dd39fe7df23a123939a1c9e140c849904b5f]
> and run `AdjustStreamThreadCountTest >
> shouldAddAndRemoveThreadsMultipleTimes` ... multiple times.
>
> The test was changed to use a stateful topology.
>
> I reproduced this on 3.9, 4.0, 4.1, trunk
>
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