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https://issues.apache.org/jira/browse/YARN-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14201708#comment-14201708
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Jian He commented on YARN-2803:
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the original response to why this change is made, but I didn't pay further 
attention..
https://issues.apache.org/jira/browse/YARN-2198?focusedCommentId=14158260&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14158260

Thought this might break windows security,  I'm OK to get this patch in and fix 
windows security separately.  thanks Craig and Chris !

> MR distributed cache not working correctly on Windows after NodeManager 
> privileged account changes.
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-2803
>                 URL: https://issues.apache.org/jira/browse/YARN-2803
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>            Reporter: Chris Nauroth
>            Assignee: Craig Welch
>            Priority: Critical
>         Attachments: YARN-2803.0.patch
>
>
> This problem is visible by running {{TestMRJobs#testDistributedCache}} or 
> {{TestUberAM#testDistributedCache}} on Windows.  Both tests fail.  Running 
> git bisect, I traced it to the YARN-2198 patch to remove the need to run 
> NodeManager as a privileged account.  The tests started failing when that 
> patch was committed.



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