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https://issues.apache.org/jira/browse/YARN-3417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033244#comment-15033244
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Varun Saxena commented on YARN-3417:
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Steve, when is this required ? In 2.9.0 or we are targetting it for trunk ?
Most of my bandwidth will be taken up by ATSv2 work. So if it is required 
immediately then probably Kuhu can take it up. I would not want to block it 
because of lack of bandwidth.
Let me know.

> AM to be able to exit with a request saying "restart me with these (possibly 
> updated) resource requirements"
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3417
>                 URL: https://issues.apache.org/jira/browse/YARN-3417
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Steve Loughran
>            Assignee: Varun Saxena
>            Priority: Minor
>
> If an AM wants to reconfigure itself or restart with new resources, there's 
> no way to do this without the active participation of a client.
> It can call System.exit and rely on YARN to restart it -but that counts as a 
> failure and may lose the entire app. furthermore, that doesn't allow the AM 
> to resize itself.
> A simple exit-code to be interpreted as restart-without-failure could handle 
> the first case; an explicit call to indicate restart, including potentially 
> new resource/label requirements, could be more reliabile, and certainly more 
> flexible.



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