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Posted to jira@kafka.apache.org by "Matthias J. Sax (Jira)" <ji...@apache.org> on 2026/08/03 19:29:00 UTC

[jira] [Assigned] (KAFKA-20869) KafkaStreams#addStreamsThread crashed global-task-only client

     [ https://issues.apache.org/jira/browse/KAFKA-20869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax reassigned KAFKA-20869:
---------------------------------------

    Assignee: Yunseop Eom

> KafkaStreams#addStreamsThread crashed global-task-only client
> -------------------------------------------------------------
>
>                 Key: KAFKA-20869
>                 URL: https://issues.apache.org/jira/browse/KAFKA-20869
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Matthias J. Sax
>            Assignee: Yunseop Eom
>            Priority: Minor
>
> KafkaStreams allows to run a "global only" topology. For this case, `KafkaStreams#start()` won't spin up any StreamsThreads (independent of `num.stream.threads` config) and only run the global-thread.
> However, addStreamsThread() has not guard for this case, and if called would create a new StreamThread which immediately crashes, taking down the whole client (with the default uncaught exception handler).
> It's even worse if the exception handler returns replace-thread, and we end up in an infinite error-loop...



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