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From "Krishna Ramachandran (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1744) DistributedCache creates its own FileSytem instance when adding a file/archive to the path
Date Tue, 08 Jun 2010 03:01:13 GMT

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

Krishna Ramachandran updated MAPREDUCE-1744:
--------------------------------------------

    Attachment: mapred-1744-1.patch

Changes since Chris's last review 

Removed deprecated string and restored correct Strings (bad copy paste from an earlier release
caused this)

TestCommandLineJobSubmission failure is not probably related to this patch - it has random
failures with or without this patch

Though it passed with patch 

    [junit] Running org.apache.hadoop.mapred.TestCommandLineJobSubmission
    [junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 56.406 sec

I get this error on a fresh checkout from trunk

testshell/ExternalMapReduce
java.lang.NoClassDefFoundError: testshell/ExternalMapReduce
        at org.apache.hadoop.mapred.TestCommandLineJobSubmission.testJobShell(TestCommandLineJobSubmission.java:122)
Caused by: java.lang.ClassNotFoundException: testshell.ExternalMapReduce
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)


> 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.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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