[jira] [Updated] (YARN-2327) YARN should warn about nodes with poor clock synchronization

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-2327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated YARN-2327:
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    Summary: YARN should warn about nodes with poor clock synchronization  (was: A hadoop cluster needs clock synchronization)

> YARN should warn about nodes with poor 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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