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https://issues.apache.org/jira/browse/YARN-2327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated YARN-2327:
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Description:
YARN should warn about nodes with poor clock synchronization.
YARN statistics rely on approximate clock synchronization in a few cases (see
YARN-2251), but we currently don't warn if this assumption is violated.
was:
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.
> 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
>
> YARN should warn about nodes with poor clock synchronization.
> YARN statistics rely on approximate clock synchronization in a few cases (see
> YARN-2251), but we currently don't warn if this assumption is violated.
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