Sunil G updated YARN-3937:
    Attachment: 0002-YARN-3937.patch

Rebasing the patch against latest trunk.

> Introducing REMOVE_CONTAINER_FROM_PREEMPTION event to notify Scheduler and AM 
> when a container is no longer to be preempted
> ---------------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-3937
>                 URL: https://issues.apache.org/jira/browse/YARN-3937
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>    Affects Versions: 2.7.1
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: 0001-YARN-3937.patch, 0002-YARN-3937.patch
> As discussed in YARN-3784, there are scenarios like few other applications 
> released containers or same application has revoked its resource requests. In 
> these cases, we may not have to preempt a container which would have been 
> marked for preemption earlier. 
> Introduce a new event to remove such containers if present in the 
> to-be-preempted list of scheduler or inform AM about such a scenario.

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