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https://issues.apache.org/jira/browse/YARN-8451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16526655#comment-16526655
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Botong Huang commented on YARN-8451:
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Good point, fixed in v2 patch!
> Multiple NM heartbeat thread created when a slow NM resync with RM
> ------------------------------------------------------------------
>
> Key: YARN-8451
> URL: https://issues.apache.org/jira/browse/YARN-8451
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Botong Huang
> Assignee: Botong Huang
> Priority: Major
> Attachments: YARN-8451.v1.patch, YARN-8451.v2.patch
>
>
> During a NM resync with RM (say RM did a master slave switch), if NM is
> running slow, more than one RESYNC event may be put into the NM dispatcher by
> the existing heartbeat thread before they are processed. As a result,
> multiple new heartbeat thread are later created and start to hb to RM
> concurrently with their own responseId. If at some point of time, one thread
> becomes more than one step behind others, RM will send back a resync signal
> in this heartbeat response, killing all containers in this NM.
> See comments below for details on how this can happen.
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