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https://issues.apache.org/jira/browse/HADOOP-6510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12806740#action_12806740
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Owen O'Malley commented on HADOOP-6510:
---------------------------------------

After off line discussion, I'd propose changing TokenIdentifier from:

{noformat}
public abstract Text getUsername();
{noformat}

to 

{noformat}
public abstract UserGroupInformation getUser();
{noformat}

Tokens that don't have users can return null, while if it is a delegation token 
it can faithfully create the correct UGI.

I'll also change my mind about mixing groups and users in the target list and 
say we should only allow group names.


> doAs for proxy user
> -------------------
>
>                 Key: HADOOP-6510
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6510
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Jitendra Nath Pandey
>            Assignee: Jitendra Nath Pandey
>         Attachments: HADOOP-6510.8.patch
>
>
> This jira will add support for a superuser authenticating on behalf of a 
> proxy user.

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