Colin Patrick McCabe commented on YARN-2327:

Thanks, Vinod, that's pretty interesting.  It sounds like this should be 
documented somewhere in our upstream docs.

It would be interesting to think of a way to avoid this clock dependency in the 
RM tokens, but I'm not sure if I have any good ideas there.  If we could limit 
it to assuming that the clocks proceeded at similar rates as you suggested, 
that would be good... I read a presentation once about attacking NTP servers 
and clients, so that could be a weak point if we rely on it for security.

> 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 relies on approximate clock synchronization to report certain elapsed 
> time statistics (see YARN-2251), but we currently don't warn if this 
> assumption is violated.

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