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https://issues.apache.org/jira/browse/YARN-7720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17572705#comment-17572705
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fanshilun commented on YARN-7720:
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I will continue to follow up on this pr.
> Race condition between second app attempt and UAM timeout when first attempt
> node is down
> -----------------------------------------------------------------------------------------
>
> Key: YARN-7720
> URL: https://issues.apache.org/jira/browse/YARN-7720
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Botong Huang
> Assignee: Botong Huang
> Priority: Major
> Attachments: YARN-7720.v1.patch, YARN-7720.v2.patch
>
>
> In Federation, multiple attempts of an application share the same UAM in each
> secondary sub-cluster. When first attempt fails, we reply on the fact that
> secondary RM won't kill the existing UAM before the AM heartbeat timeout
> (default at 10 min). When second attempt comes up in the home sub-cluster, it
> will pick up the UAM token from Yarn Registry and resume the UAM heartbeat to
> secondary RMs.
> The default heartbeat timeout for NM and AM are both 10 mins. The problem is
> that when the first attempt node goes down or out of connection, only after
> 10 mins will the home RM mark the first attempt as failed, and then schedule
> the 2nd attempt in some other node. By then the UAMs in secondaries are
> already timing out, and they might not survive until the second attempt comes
> up.
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