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https://issues.apache.org/jira/browse/MAPREDUCE-1744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877354#action_12877354
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Arun C Murthy commented on MAPREDUCE-1744:
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I take it back, Amareshwari's comment seems reasonable and looks like we are
stuck with URI anyway for the 'symlink' feature. Sigh.
> DistributedCache creates its own FileSytem instance when adding a
> file/archive to the path
> ------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1744
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1744
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Dick King
> Assignee: Krishna Ramachandran
> Attachments: BZ-3503564--2010-05-06.patch, h1744.patch,
> mapred-1744-1.patch, mapred-1744-2.patch, mapred-1744.patch,
> MAPREDUCE-1744.patch
>
>
> According to the contract of {{UserGroupInformation.doAs()}} the only
> required operations within the {{doAs()}} block are the
> creation of a {{JobClient}} or getting a {{FileSystem}} .
> The {{DistributedCache.add(File/Archive)ToClasspath()}} methods create a
> {{FileSystem}} instance outside of the {{doAs()}} block,
> this {{FileSystem}} instance is not in the scope of the proxy user but of the
> superuser and permissions may make the method
> fail.
> One option is to overload the methods above to receive a filesystem.
> Another option is to do obtain the {{FileSystem}} within a {{doAs()}} block,
> for this it would be required to have the proxy
> user set in the passed configuration.
> The second option seems nicer, but I don't know if the proxy user is as a
> property in the jobconf.
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