Vinod Kumar Vavilapalli commented on YARN-2327:

Delegation Tokens are only verified on the servers (NN or RM), so this issue 
doesn't happen there. The right analogy is block-tokens, which have the same 

> 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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