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https://issues.apache.org/jira/browse/MAPREDUCE-4568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475993#comment-13475993
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Arun C Murthy commented on MAPREDUCE-4568:
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Clients can already query contents of DC...
> Throw "early" exception when duplicate files or archives are found in
> distributed cache
> ---------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4568
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4568
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Mohammad Kamrul Islam
> Assignee: Arun C Murthy
>
> According to #MAPREDUCE-4549, Hadoop 2.x throws exception if duplicates found
> in cacheFiles or cacheArchives. The exception throws during job submission.
> This JIRA is to throw the exception ==early== when it is first added to the
> Distributed Cache through addCacheFile or addFileToClassPath.
> It will help the client to decide whether to fail-fast or continue w/o the
> duplicated entries.
> Alternatively, Hadoop could provide a knob where user will choose whether to
> throw error( coming behavior) or silently ignore (old behavior).
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