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From "Hemanth Yamijala (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4490) Map and Reduce tasks should run as the user who submitted the job
Date Tue, 13 Jan 2009 07:52:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12663257#action_12663257
] 

Hemanth Yamijala commented on HADOOP-4490:
------------------------------------------

The latest patch also adds correct permissions to files localized as part of the distributed
cache. In order to do this, I introduced a new API in distributed cache to indicate whether
the files were localized freshly (i.e. as part of the current task's localization), or whether
they are already existing in cache. I use this API to avoid setting permissions on the same
cache files repeatedly for each task. If there's a better way to do this, I would be glad
to know that.

All changes made in the previous patch still hold good, except for minor refactoring.

This patch is now complete to the best of my knowledge. Please do offer your comments.

> 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
>         Attachments: hadoop-4490-design.pdf, HADOOP-4490.patch, HADOOP-4490.patch, HADOOP-4490.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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