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https://issues.apache.org/jira/browse/MAPREDUCE-5367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724508#comment-13724508
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Sandy Ryza commented on MAPREDUCE-5367:
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Uploading patches for both MR1 and MR2. For both, the job directory will be
localRunner/user/job_id and the task directories will be
localRunner/user/job_id/task_id.
> 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-b1-1.patch, 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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