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https://issues.apache.org/jira/browse/HADOOP-3578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12606293#action_12606293
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Hemanth Yamijala commented on HADOOP-3578:
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bq. The names of the job directories start with job_. hadoop dfs -rmr job_*
would remove them, right ? I tried it on my directories, and wild card removal
of directories seems to be working. So, I am assuming it will work even for the
mapred system directories children.
Sorry, I take that back. It probably worked because it is my directories. I
don't think dfs -rmr job_* will delete directories not owned by me, if there
are no execute permissions on the parent.
> 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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