Sunil G updated YARN-3224:
    Attachment: 0001-YARN-3224.patch

Attaching a work in progress patch. As this patch is directly dependent on 
YARN-3212, I will rebase the same as it gets committed.

Also current preemption framework doesnt have support to inform AM about 
timeout of to-be-preempted container. As YARN-3784 gets in, we can leverage the 
same here. 

> Notify AM with containers (on decommissioning node) could be preempted after 
> timeout.
> -------------------------------------------------------------------------------------
>                 Key: YARN-3224
>                 URL: https://issues.apache.org/jira/browse/YARN-3224
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Junping Du
>            Assignee: Sunil G
>         Attachments: 0001-YARN-3224.patch
> We should leverage YARN preemption framework to notify AM that some 
> containers will be preempted after a timeout.

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