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https://issues.apache.org/jira/browse/MAPREDUCE-2757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13073019#comment-13073019
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Jonathan Eagles commented on MAPREDUCE-2757:
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It looks like the "file:" directory is generated in ContainerLocalizer.initDirs.
> [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
> Priority: Minor
> Fix For: 0.23.0
>
>
> 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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