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https://issues.apache.org/jira/browse/MAPREDUCE-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830625#action_12830625
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Vinod K V commented on MAPREDUCE-1457:
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Can you please explain the individual changes for the sake for records? 
Couldn't see what this issue is addressing without looking at the patch itself. 
Thanks!

> For secure job execution, couple of more UserGroupInformation.doAs needs to 
> be added
> ------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1457
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1457
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>    Affects Versions: 0.22.0
>            Reporter: Devaraj Das
>            Assignee: Jakob Homan
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-1457-BPY20.patch, MAPREDUCE-1457-BPY20.patch, 
> MAPREDUCE-1457.patch, MAPREDUCE-1457.patch, MAPREDUCE-1457.patch
>
>
> During our testing in a kerberos environment, we had to add 
> UserGroupInformation.doAs blocks in certain places.

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