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Date: Tue, 25 Oct 2011 12:34:32 +0000 (UTC)
From: "Kihwal Lee (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-2915) LinuxTaskController does not
 work when JniBasedUnixGroupsNetgroupMapping or JniBasedUnixGroupsMapping is
 enabled
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-2915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134978#comment-13134978 ] 

Kihwal Lee commented on MAPREDUCE-2915:
---------------------------------------

Sorry, I misread the code in trunk/0.23. They do have a similar problem. MAPREDUCE-3259 has been filed.
                
> LinuxTaskController does not work when JniBasedUnixGroupsNetgroupMapping or JniBasedUnixGroupsMapping is enabled
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2915
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2915
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task-controller
>    Affects Versions: 0.20.205.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 0.20.205.0
>
>         Attachments: linux_tc_fix.patch.txt, mr-2915.patch.txt
>
>
> When a job is submitted, LinuxTaskController launches the native task-controller binary for job initialization. The native program does a series of prep work and call execv() to run JobLocalizer.  It was observed that JobLocalizer does fails to run when JniBasedUnixGroupsNetgroupMapping or JniBasedUnixGroupsMapping is enabled, resulting in 100% job failures.
> JobLocalizer normally does not need the native library (libhadoop) for its functioning, but enabling a JNI user-to-group mapping function cause it to load the library. However, JobLocalizer cannot locate the library since "java.library.path" is not set.
> The proposed solution is to pass the java.library.path property through task-controller. LinuxTaskController already does it when launching the task log truncater.

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