Wangda Tan created YARN-3139:

             Summary: Improve locks in 
                 Key: YARN-3139
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: resourcemanager, scheduler
            Reporter: Wangda Tan
            Assignee: Li Lu

Enhance locks in AbstractYarnScheduler/CapacityScheduler/FairScheduler, as 
mentioned in YARN-3091, a possible solution is using read/write lock. Other 
fine-graind locks for specific purposes / bugs should be addressed in separated 

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