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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-2327) YARN should warn about nodes with poor clock synchronization
Date Mon, 21 Jul 2014 18:12:41 GMT

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

Colin Patrick McCabe updated YARN-2327:
---------------------------------------

    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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