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https://issues.apache.org/jira/browse/YARN-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14631671#comment-14631671
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Wangda Tan commented on YARN-3784:
----------------------------------

Hi [~sunilg],
Thanks for your comments, I will post cancel-preemption event related comments 
to YARN-3937 soon.

> Indicate preemption timout along with the list of containers to AM 
> (preemption message)
> ---------------------------------------------------------------------------------------
>
>                 Key: YARN-3784
>                 URL: https://issues.apache.org/jira/browse/YARN-3784
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: 0001-YARN-3784.patch, 0002-YARN-3784.patch
>
>
> Currently during preemption, AM is notified with a list of containers which 
> are marked for preemption. Introducing a timeout duration also along with 
> this container list so that AM can know how much time it will get to do a 
> graceful shutdown to its containers (assuming one of preemption policy is 
> loaded in AM).
> This will help in decommissioning NM scenarios, where NM will be 
> decommissioned after a timeout (also killing containers on it). This timeout 
> will be helpful to indicate AM that those containers can be killed by RM 
> forcefully after the timeout.



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