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https://issues.apache.org/jira/browse/SPARK-27021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16996571#comment-16996571
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Attila Zsolt Piros commented on SPARK-27021:
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[~roncenzhao] it seems to me you bumped into
https://issues.apache.org/jira/browse/SPARK-26418
> Leaking Netty event loop group for shuffle chunk fetch requests
> ---------------------------------------------------------------
>
> Key: SPARK-27021
> URL: https://issues.apache.org/jira/browse/SPARK-27021
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.4.0, 2.4.1, 3.0.0
> Reporter: Attila Zsolt Piros
> Assignee: Attila Zsolt Piros
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: image-2019-12-14-23-23-50-384.png
>
>
> The extra event loop group created for handling shuffle chunk fetch requests
> are never closed.
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