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https://issues.apache.org/jira/browse/SPARK-3632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14367863#comment-14367863
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Thomas Graves commented on SPARK-3632:
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[~andrewor14] At this point doesn't seem like we need to port back to branch1,
you ok if we close this?
> ConnectionManager can run out of receive threads with authentication on
> -----------------------------------------------------------------------
>
> Key: SPARK-3632
> URL: https://issues.apache.org/jira/browse/SPARK-3632
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.1.0
> Reporter: Thomas Graves
> Assignee: Thomas Graves
> Priority: Critical
> Labels: backport-needed
> Fix For: 1.2.0
>
>
> If you turn authentication on and you are using a lot of executors. There is
> a chance that all the of the threads in the handleMessageExecutor could be
> waiting to send a message because they are blocked waiting on authentication
> to happen. This can cause a temporary deadlock until the connection times out.
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