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https://issues.apache.org/jira/browse/MAPREDUCE-2757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091298#comment-13091298
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Siddharth Seth commented on MAPREDUCE-2757:
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For now, we should probably just have a utility function to figure out how to
interpret paths specified by the user - this can take care of converting them
to the correct format or spewing out warnings (ref: DataNode.getStorageDirs).
Having a consistent format for specifying local dirs between MR and HDFS would
be nice.
The LocalDirAllocator could be changed to work with and without schemes
(accepting only file:) while still working with absolute and relative paths.
That would be a hadoop common jira.
> [MR-279] Redundant "file:" directory created in appcache
> ---------------------------------------------------------
>
> Key: MAPREDUCE-2757
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2757
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Ramya Sunil
> Assignee: Jonathan Eagles
> Priority: Minor
> Fix For: 0.23.0
>
> Attachments: MAPREDUCE-2757-trunk-v1.patch
>
>
> A redundant directory called "file:" is being created under
> ${yarn.server.nodemanager.local-dir}/usercache/${username}/appcache/appID
> which further has a directory structure
> ${yarn.server.nodemanager.local-dir}/usercache/${username}/(appcache|filecache)/appID/filecache
> which is empty.
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