Wangda Tan created YARN-2925:

             Summary: Internal fields in LeafQueue access should be protected 
when accessed from FiCaSchedulerApp to calculate Headroom
                 Key: YARN-2925
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
            Reporter: Wangda Tan
            Assignee: Wangda Tan
            Priority: Critical

Upon YARN-2644, FiCaScheduler will calculation up-to-date headroom before 
sending back Allocation response to AM.

Headroom calculation is happened in LeafQueue side, uses fields like used 
resource, etc. But it is not protected by any lock of LeafQueue, so it might be 
corrupted is someone else is editing it.

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