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https://issues.apache.org/jira/browse/HADOOP-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sreekanth Ramakrishnan updated HADOOP-4490:
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    Attachment: HADOOP-4490-3.patch

Attaching a patch which resolves the NullPointerException raised when TT is 
re-inted. The problem was with race condition in which JVMRunner was issued 
kill before it launched the task. The patch now checks if the inital context is 
set. i.e task is launched if not, it merely updates the data structures.

> Map and Reduce tasks should run as the user who submitted the job
> -----------------------------------------------------------------
>
>                 Key: HADOOP-4490
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4490
>             Project: Hadoop Core
>          Issue Type: Sub-task
>          Components: mapred, security
>            Reporter: Arun C Murthy
>            Assignee: Hemanth Yamijala
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-4490-1.patch, HADOOP-4490-1.patch, 
> HADOOP-4490-2.patch, HADOOP-4490-3.patch, hadoop-4490-design.pdf, 
> HADOOP-4490.patch, HADOOP-4490.patch, HADOOP-4490.patch, HADOOP-4490.patch, 
> HADOOP-4490.patch, HADOOP-4490.patch, HADOOP-4490.patch, 
> HADOOP-4490_streaming.patch
>
>
> Currently the TaskTracker spawns the map/reduce tasks, resulting in them 
> running as the user who started the TaskTracker.
> For security and accounting purposes the tasks should be run as the job-owner.

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