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From "Dick King (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1744) DistributedCache creates its own FileSytem instance when adding a file/archive to the path
Date Wed, 19 May 2010 16:59:56 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869206#action_12869206
] 

Dick King commented on MAPREDUCE-1744:
--------------------------------------

On the patch {{h1744.patch}} of 2010-05-15 04:36 PM , can we avoid broadening the exception
signature of {{Job.add*ToClassPath(Path)}} by using {{FileSystem.get(conf)}} instead of {{cluster.getFileSystem()}}
?

-dk


> 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
>         Attachments: BZ-3503564--2010-05-06.patch, h1744.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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