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https://issues.apache.org/jira/browse/MAPREDUCE-4234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Joseph Evans updated MAPREDUCE-4234:
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    Attachment: MR-4234.txt

The failure looks spurious to me. I have not been able to reproduce it.  I have 
upmerged and am posting the updated patch.
                
> SortValidator.java is incompatible with multi-user or parallel use (due to a 
> /tmp file with static name)
> --------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4234
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4234
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: examples
>    Affects Versions: 0.23.3, trunk
>            Reporter: Randy Clayton
>            Assignee: Robert Joseph Evans
>            Priority: Minor
>         Attachments: MAPREDUCE-4234.patch, MR-4234.txt, MR-4234.txt
>
>
> The SortValidator.java file checkRecords method creates a file in the 
> /tmp/sortvalidator directory using a static filename. This can result in 
> failures due to name collisions when the 
> hadoop-mapreduce-client-jobclient-*-tests jar is used by more than one task 
> or one user simultaneously. We use this jar when testing compression codecs 
> and after we started running tests in parallel (four at a time to reduce 
> overall test time) we started experiencing random test failures due to name 
> collisions. Creating a random or unique per thread filename may resolve this 
> issue. We have developed a change to introduce per use unique file names. 

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