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https://issues.apache.org/jira/browse/SPARK-28239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-28239:
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Assignee: Apache Spark
> Allow TCP connections created by shuffle service auto close on YARN
> NodeManagers
> --------------------------------------------------------------------------------
>
> Key: SPARK-28239
> URL: https://issues.apache.org/jira/browse/SPARK-28239
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle, YARN
> Affects Versions: 2.4.0
> Environment: Hadoop2.6.0-CDH5.8.3(netty3)
> Spark2.4.0(netty4)
> Configs:
> spark.shuffle.service.enabled=true
> Reporter: Deegue
> Assignee: Apache Spark
> Priority: Minor
> Attachments: screenshot-1.png, screenshot-2.png
>
>
> When executing shuffle tasks, TCP connections(on port 7337 by default) will
> be established by shuffle service.
> It will like:
> !screenshot-1.png!
> However, some of the TCP connections are still busy when the task is actually
> finished. These connections won't close automatically until we restart the
> NodeManager process.
> Connections pile up and NodeManagers are getting slower and slower.
> !screenshot-2.png!
> These unclosed TCP connections stay busy and it seem doesn't take effect when
> I set ChannelOption.SO_KEEPALIVE to true according to
> [SPARK-23182|https://github.com/apache/spark/pull/20512].
> So the solution is setting ChannelOption.AUTO_CLOSE to true, and after which
> our cluster(running 10000+ jobs / day) is processing normally.
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