Xianyin Xin commented on YARN-4177:

In a following steps I would try to fix several important places where clock is 

> 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
>         Attachments: YARN-4177.001.patch
> 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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