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https://issues.apache.org/jira/browse/MAPREDUCE-2651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13071427#comment-13071427
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Bharath Mundlapudi commented on MAPREDUCE-2651:
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Some more details:
1. This is a port of the same change Chris Douglas made for MR-279.
2. I have unit tested this code using test-task-controller and all tests pass.
3. Also, I have tested on a multiple user cluster with security and linux task
controller configured. And verified all the permissions on the directories.
> Race condition in Linux Task Controller for job log directory creation
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-2651
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2651
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task-controller
> Affects Versions: 0.20.204.0
> Reporter: Bharath Mundlapudi
> Assignee: Bharath Mundlapudi
> Fix For: 0.20.205.0
>
> Attachments: MAPREDUCE-2651-1.patch
>
>
> There is a rare race condition in linux task controller when concurrent task
> processes tries to create job log directory at the same time.
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