Colin Patrick McCabe moved HADOOP-10794 to YARN-2327:

        Key: YARN-2327  (was: HADOOP-10794)
    Project: Hadoop YARN  (was: Hadoop Common)

> A hadoop cluster needs clock synchronization
> --------------------------------------------
>                 Key: YARN-2327
>                 URL: https://issues.apache.org/jira/browse/YARN-2327
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Zhijie Shen
> As a distributed system, a hadoop cluster wants the clock on all the 
> participating hosts synchronized. Otherwise, some problems might happen. For 
> example, in YARN-2251, due to the clock on the host for the task container 
> falls behind that on the host of the AM container, the computed elapsed time 
> (the diff between the timestamps produced on two hosts) becomes negative.
> In YARN-2251, we tried to mask the negative elapsed time. However, we should 
> seek for a decent long term solution, such as providing mechanism to do and 
> check clock synchronization.

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