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https://issues.apache.org/jira/browse/HADOOP-10467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13970074#comment-13970074
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Benoy Antony commented on HADOOP-10467:
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In some cases, it takes a longer time to add users to groups. In those 
situations, the ability to specify usernames in the _proxyuserconfiguration_ 
will enable administrators to quickly unblock users. That's the use case. 
Similar ability is available in yarn queue acls. 

An implementation choice would have been to add a separate property for users 
alone. But to maintain parity with queue acls , I added usergroups which can 
accept users and groups. If maintaining parity with Queue ACL specification is 
not important, I can create a new property - users instead of usergroups.

The syntax is _user1,user2SPACEgroup1,group2_ (Same as in queue acls). Since 
these properties are per user, they are not in core-default.xml. I can specify 
the syntax and new configuration in the release notes. Would that be 
appropriate ?






> Enable proxyuser specification to support list of users in addition to list 
> of groups.
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10467
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10467
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: security
>            Reporter: Benoy Antony
>            Assignee: Benoy Antony
>         Attachments: HADOOP-10467.patch, HADOOP-10467.patch
>
>
> Today , the proxy user specification supports only list of groups. In some 
> cases, it is useful to specify the list of users in addition to list of 
> groups. 



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