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https://issues.apache.org/jira/browse/MAPREDUCE-2757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090460#comment-13090460
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Jonathan Eagles commented on MAPREDUCE-2757:
--------------------------------------------
Further analysis
ContainerLocalizer.initDirs qualifies (e.g. file:///tmp instead of just /tmp)
all paths and then serializes the qualified path as strings into the
Configuration. Qualified paths are not part of the supported interface as part
of the fs LocalDirAllocator. It in turn tries to deserializes the qualified
path strings directly into a java.io.File. Thus instead of testing to see
whether the path is user writable, it instead recursively creates a dir name
file: containing a dir named tmp in the current working directory of the local
file system.
> [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
>
>
> 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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