Karthik Kambatla created YARN-4526:

             Summary: Make SystemClock singleton so AppSchedulingInfo could use 
                 Key: YARN-4526
                 URL: https://issues.apache.org/jira/browse/YARN-4526
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: scheduler
    Affects Versions: 2.8.0
            Reporter: Karthik Kambatla
            Assignee: Karthik Kambatla

To track the time a request is received, we need to get current system time. 
For better testability of this, we are likely better off using a Clock instance 
that uses SystemClock by default. Instead of creating umpteen instances of 
SystemClock, we should just reuse the same instance. 

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