Xianyin Xin created YARN-4177:

             Summary: yarn.util.Clock should not be used to time a duration or 
time interval
                 Key: YARN-4177
                 URL: https://issues.apache.org/jira/browse/YARN-4177
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Xianyin Xin

There're many places uses Clock to time intervals, which is dangerous as 
commented by [~ste...@apache.org] in HADOOP-12409. Instead, we should use 
hadoop.util.Timer#monotonicNow() to get monotonic time. Or we could provide a 
MonotonicClock in yarn.util considering the consistency of code.

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