[jira] Work stopped: (MAPREDUCE-1744) DistributedCache creates its own FileSytem instance when adding a file/archive to the path

["Krishna Ramachandran (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on MAPREDUCE-1744 stopped by Krishna Ramachandran.

> 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.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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