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https://issues.apache.org/jira/browse/MAPREDUCE-5367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713112#comment-13713112
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Sandy Ryza commented on MAPREDUCE-5367:
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Uploading a patch that adds the job ID to the local job dir. As with
MAPREDUCE-4278, it's difficult to write a test for this, because it requires
two separate LocalJobRunner processes to reproduce the issue. I've run the
existing LocalJobRunner tests as well as run concurrent jobs locally and
verified that they use different directories.
> 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
> Attachments: MAPREDUCE-5367-b1.patch
>
>
> 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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