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https://issues.apache.org/jira/browse/MAPREDUCE-5367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699463#comment-13699463
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Ben Podgursky commented on MAPREDUCE-5367:
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Yeah, the problem is if the jobs are running in different JVMs, the job
numbering starts at over at 0001, so there are still conflicts (for example if
our build server starts two tests concurrently.)
> Local jobs all use same local working directory
> -----------------------------------------------
>
> Key: MAPREDUCE-5367
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5367
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 1.2.0
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
>
> This means that local jobs, even in different JVMs, can't run concurrently
> because they might delete each other's files during work directory setup.
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