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https://issues.apache.org/jira/browse/KAFKA-4431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15749174#comment-15749174
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David Judd commented on KAFKA-4431:
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Awesome, thanks!
> HeartbeatThread should be a daemon thread
> -----------------------------------------
>
> Key: KAFKA-4431
> URL: https://issues.apache.org/jira/browse/KAFKA-4431
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.10.1.0
> Reporter: David Judd
> Assignee: Rajini Sivaram
> Fix For: 0.10.1.1, 0.10.2.0
>
>
> We're seeing an issue where an exception inside the main processing loop of a
> consumer doesn't cause the JVM to exit, as expected (and, in our case,
> desired). From the thread dump, it appears that what's blocking exit is the
> "kafka-coordinator-heartbeat-thread", which is not currently a daemon thread.
> Per the mailing list, it sounds like this is a bug.
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