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