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

["Dick King (JIRA)" <ji...@apache.org>]

DistributedCache creates its own FileSytem instance when adding a file/archive to the path
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                 Key: MAPREDUCE-1744
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1744
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Dick King


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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