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https://issues.apache.org/jira/browse/SPARK-32738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17407167#comment-17407167
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Apache Spark commented on SPARK-32738:
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User 'sleep1661' has created a pull request for this issue:
https://github.com/apache/spark/pull/33872
> thread safe endpoints may hang due to fatal error
> -------------------------------------------------
>
> Key: SPARK-32738
> URL: https://issues.apache.org/jira/browse/SPARK-32738
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.3.4, 2.4.6, 3.0.0
> Reporter: Zhenhua Wang
> Assignee: Zhenhua Wang
> Priority: Major
> Fix For: 2.4.8, 3.0.2, 3.1.0
>
>
> Processing for `ThreadSafeRpcEndpoint` is controlled by 'numActiveThreads' in
> `Inbox`. Now if any fatal error happens during `Inbox.process`,
> 'numActiveThreads' is not reduced. Then other threads can not process
> messages in that inbox, which causes the endpoint to "hang".
> This problem is more serious in previous Spark 2.x versions since the driver,
> executor and block manager endpoints are all thread safe endpoints.
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