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https://issues.apache.org/jira/browse/MAPREDUCE-5367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13719649#comment-13719649
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Tom White commented on MAPREDUCE-5367:
--------------------------------------
I noticed that {{jobDir}} is being assigned to {{LocalJobRunner.SUBDIR}}, i.e.
"localRunner/" with no job ID, so {{getLocalTaskDir()}} will return a path that
is not unique for the job. The fix here is to make {{getLocalTaskDir()}}
non-static. If {{jobDir}} were renamed to {{JOB_BASE_DIR}} then this problem
would be less likely to be re-introduced in the future.
Also, {{jobDir}} ends in "/", so there is no need to add another path
separator. It's probably better to use the {{new Path(parent, child)}}
constructor anyway.
> 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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