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https://issues.apache.org/jira/browse/KAFKA-19510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-19510.
-------------------------------------
Fix Version/s: 3.9.2
4.2.0
4.0.2
4.1.1
Resolution: Fixed
> 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
> Fix For: 3.9.2, 4.2.0, 4.0.2, 4.1.1
>
>
> 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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