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https://issues.apache.org/jira/browse/MAPREDUCE-3982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225294#comment-13225294
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Robert Joseph Evans commented on MAPREDUCE-3982:
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That would not really work. The directory structure is the following.
<OUTPUT>/_temporary/<ATTEMPT_ID>/...
The problem was that the code assumed that <OUTPUT>/_temporary/<ATTEMPT_ID>/
was being created by the individual map/reduce tasks. If it was not then other
code would blowup, so instead of just creating <OUTPUT>/_temporary in the setup
from before we are now creating <OUTPUT>/_temporary/<ATTEMPT_ID>/
When we clean up from a job we still want to completely remove the _temporary
directory, not just <OUTPUT>/_temporary/<ATTEMPT_ID>/ or there will be an extra
directory sitting around in the <OUTPUT> directory that will cause other
problems.
> TestEmptyJob fails with FileNotFound
> ------------------------------------
>
> Key: MAPREDUCE-3982
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3982
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.24.0, 0.23.2
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Critical
> Attachments: MR-3982.txt
>
>
> TestEmptyJob fails because teh FileOutputCommitter expects a directory to be
> created that is not created. The FileOutputCommitter should either ignore
> the error or create the directory itself.
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