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https://issues.apache.org/jira/browse/HBASE-27810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajeshbabu Chintaguntla resolved HBASE-27810.
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Resolution: Fixed
Pushed to branch-2.4+
Thanks [~andor] for the patch.
> HBCK throws RejectedExecutionException when closing ZooKeeper resources
> -----------------------------------------------------------------------
>
> Key: HBASE-27810
> URL: https://issues.apache.org/jira/browse/HBASE-27810
> Project: HBase
> Issue Type: Bug
> Components: hbck
> Affects Versions: 2.6.0, 3.0.0-alpha-3, 2.4.17, 2.5.4
> Reporter: Andor Molnar
> Assignee: Andor Molnar
> Priority: Major
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.5.5, 2.4.18
>
>
> HBCK throws RejectedExecutionException at the end of run, because the order
> of closing ZooKeeper resources has been swapped in HBASE-27426.
> In ZKWatcher.java close() method first it shuts down the zkEventProcessor and
> when it fully shut down, it closes the RecoverableZooKeeper (the ZK client).
> The watcher receives the close event which cannot be submitted to the event
> processor and throws exception.
> I think we need to check whether the executor is able to receive jobs before
> submitting.
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