Anubhav Dhoot created YARN-3008:

             Summary: FairScheduler: Use lock for queuemanager instead of 
synchronized on FairScheduler
                 Key: YARN-3008
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: fairscheduler
            Reporter: Anubhav Dhoot

Instead of a big monolithic lock on FairScheduler, we can have an explicit lock 
on queuemanager and revisit all synchronized methods in FairScheduler

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