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https://issues.apache.org/jira/browse/KAFKA-8831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16916005#comment-16916005
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Vinoth Chandar commented on KAFKA-8831:
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With this log statement _log.info("Active : " + active.allTasksRunning());_,
can confirm that active tasks are not deemed running. it's continuously false.
> Joining a new instance sometimes does not cause rebalancing
> -----------------------------------------------------------
>
> Key: KAFKA-8831
> URL: https://issues.apache.org/jira/browse/KAFKA-8831
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Chris Pettitt
> Assignee: Chris Pettitt
> Priority: Major
> Attachments: StandbyTaskTest.java, fail.log
>
>
> See attached log. The application is in a REBALANCING state. The second
> instance joins a bit after the first instance (~250ms). The group coordinator
> says it is going to rebalance but nothing happens. The first instance gets
> all partitions (2). The application transitions to RUNNING.
> See attached test, which starts one client and then starts another about
> 250ms later. This seems to consistently repro the issue for me.
> This is blocking my work on KAFKA-8755, so I'm inclined to pick it up
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