Karthik Kambatla created YARN-2328:

             Summary: FairScheduler: Update and Continuous-Scheduling threads 
should be singletons
                 Key: YARN-2328
                 URL: https://issues.apache.org/jira/browse/YARN-2328
             Project: Hadoop YARN
          Issue Type: Improvement
    Affects Versions: 2.4.1
            Reporter: Karthik Kambatla
            Assignee: Karthik Kambatla
            Priority: Minor

FairScheduler threads can use a little cleanup and tests. To begin with, the 
update and continuous-scheduling threads should extend Thread and be 
singletons. We should have tests for starting and stopping them as well. 

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