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https://issues.apache.org/jira/browse/TEZ-3894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358845#comment-16358845
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Kuhu Shukla commented on TEZ-3894:
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The patch looks good to me. +1. Committing this shortly.
> Tez intermediate outputs implicitly rely on permissive umask for shuffle
> ------------------------------------------------------------------------
>
> Key: TEZ-3894
> URL: https://issues.apache.org/jira/browse/TEZ-3894
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Major
> Attachments: TEZ-3894.001.patch
>
>
> Tez does not explicitly set the permissions of intermediate output files for
> shuffle. In a secure cluster the shuffle service is running as a different
> user than the task, so the output files require group readability in order to
> serve up the data during the shuffle phase. If the umask is too restrictive
> (e.g.: 077) then the task's file.out and file.out.index permissions can be
> too restrictive to allow the shuffle handler to access them.
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