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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:
-------------------------------------------

    Attachment: HADOOP-4490-1.patch

Attaching patch incorporating Comments from Hemanth and Arun. The only change 
which has been done which move away from the above are:

* No seperate permissions being set for pid directories, as they are not being 
used in the current trunk.
* Assumption that path to jobcache directory, log directory the user who runs 
task would have read and execute permission along the path.



> 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-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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