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https://issues.apache.org/jira/browse/HADOOP-3578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605834#action_12605834
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Hemanth Yamijala commented on HADOOP-3578:
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Doug, one of the issues in making directories writable is that files could get
deleted right. So, it means one user's job directory created under
mapred.system.dir could be deleted by another user, no ? If there is a concept
like sticky bit in HDFS, then it would help to avoid this problem.
> mapred.system.dir should be accessible only to hadoop daemons
> --------------------------------------------------------------
>
> Key: HADOOP-3578
> URL: https://issues.apache.org/jira/browse/HADOOP-3578
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Amar Kamat
>
> Currently the jobclient accesses the {{mapred.system.dir}} to add job
> details. Hence the {{mapred.system.dir}} has the permissions of
> {{rwx-wx-wx}}. This could be a security loophole where the job files might
> get overwritten/tampered after the job submission.
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