Sunil G created YARN-5731:

             Summary: Preemption does not work in few corner cases where 
reservations are placed
                 Key: YARN-5731
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacity scheduler
    Affects Versions: 2.7.3
            Reporter: Sunil G
            Assignee: Sunil G

Preemption doesnt kick in under below scenario.

Two queues A and B each with 50% capacity and 100% maximum capacity and user 
limit factor 2. Job which is submitted to queueA has taken 95% of resources in 
cluster. Remaining 5% was also reserved by same job as demand was still higher.
Now submit a small job with AM container size is lesser to above mentioned 5%. 
Job waits and no preemption is happening.

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