Peng Zhang created YARN-3405:

             Summary: FairScheduler's preemption cannot happen between sibling 
in some case
                 Key: YARN-3405
             Project: Hadoop YARN
          Issue Type: Bug
          Components: fairscheduler
    Affects Versions: 2.7.0
            Reporter: Peng Zhang
            Priority: Critical

Queue hierarchy described as below:
          /         \
queue-1-1    queue-1-2

1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not 
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.

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