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Date: Wed, 2 Dec 2009 02:40:20 +0000 (UTC)
From: "Jakob Homan (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4656) Add a user to groups mapping
 service
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    [ https://issues.apache.org/jira/browse/HADOOP-4656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784594#action_12784594 ] 

Jakob Homan commented on HADOOP-4656:
-------------------------------------

Of note, with the patch applied I'm seeing a time-out for TestIPC and a failure of TestIPCServerResponder:testServerResponder (null value encountered).  I'm not seeing this without the patch applied.  We should investigate why this is happening before submitting an updated patch. 

> 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: Boris Shkolnik
>         Attachments: HADOOP-4656-1.patch, HADOOP-4656-2.patch, HADOOP-4656.patch, 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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