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https://issues.apache.org/jira/browse/HADOOP-4656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755111#action_12755111
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Allen Wittenauer commented on HADOOP-4656:
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AFAIK, Hadoop has no concept of uid, as everything in the HDFS, etc, is stored
as a string. So the username is about all the context you can probably get. :)
> Add a user to groups mapping service
> -------------------------------------
>
> Key: HADOOP-4656
> URL: https://issues.apache.org/jira/browse/HADOOP-4656
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Affects Versions: 0.19.0
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Attachments: HADOOP-4656_0_20090108.patch
>
>
> Currently the IPC client sends the UGI which contains the user/group
> information for the Server. However this represents the groups for the user
> on the client-end. The more pertinent mapping from user to groups is actually
> the one seen by the Server. Hence the client should only send the user and we
> should add a 'group mapping service' so that the Server can query it for the
> mapping.
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