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https://issues.apache.org/jira/browse/HADOOP-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12666220#action_12666220
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Arun C Murthy commented on HADOOP-4490:
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Hemanth, this is look good.
Some comments:
# We should use mapred.local.dir instead of hadoop.tmp.dir in
LinuxTaskController.
# Use Path's methods instead of String manipulation for all path-related
manipulations.
# Pass mode, user/group to DistributedCache rather than rely on the newly
introduced DistributedCache.isFreshlyLoaded which is then unnecessary.
# Move setting up of JVM-specific files e.g. task's log directory to
TaskController.launchJVM.
> 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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