Sunil G created YARN-3937:

             Summary: Introducing REMOVE_CONTAINER_FROM_PREEMPTION event to 
notify Scheduler and AM when a container is no longer to be preempted
                 Key: YARN-3937
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
    Affects Versions: 2.7.1
            Reporter: Sunil G
            Assignee: Sunil G

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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