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https://issues.apache.org/jira/browse/YARN-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13995326#comment-13995326
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Tsuyoshi OZAWA commented on YARN-2001:
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[~adhoot], you're correct basically. I meant that if epoch gap between RM and
NM is too large to handle for RM, it can be killed. It saves memory usage of RM.
> Threshold for RM to accept requests from AM after failover
> ----------------------------------------------------------
>
> Key: YARN-2001
> URL: https://issues.apache.org/jira/browse/YARN-2001
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Jian He
> Assignee: Jian He
>
> After failover, RM may require a certain threshold to determine whether it’s
> safe to make scheduling decisions and start accepting new container requests
> from AMs. The threshold could be a certain amount of nodes. i.e. RM waits
> until a certain amount of nodes joining before accepting new container
> requests. Or it could simply be a timeout, only after the timeout RM accepts
> new requests.
> NMs joined after the threshold can be treated as new NMs and instructed to
> kill all its containers.
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