sandflee created YARN-4519:
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             Summary: potential deadlock of CapacityScheduler between decrease 
container and assign containers
                 Key: YARN-4519
                 URL: https://issues.apache.org/jira/browse/YARN-4519
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
            Reporter: sandflee


In CapacityScheduler.allocate() , first get FiCaSchedulerApp sync lock, and may 
be get CapacityScheduler's sync lock in decreaseContainer()
In scheduler thread,  first get CapacityScheduler's sync lock in 
allocateContainersToNode, and may get FiCaSchedulerApp sync lock in 
FicaSchedulerApp.assignContainers. 



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