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https://issues.apache.org/jira/browse/MAPREDUCE-5367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13699456#comment-13699456
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Sandy Ryza commented on MAPREDUCE-5367:
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My patch was going to just add the job ID in. Is there a reason that the
random UUID is needed on top of that?
> 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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