[jira] Commented: (HADOOP-4656) Add a user to groups mapping service

["Arun C Murthy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647677#action_12647677 ] 

Arun C Murthy commented on HADOOP-4656:
---------------------------------------

HADOOP-4348 is switching IPC to use the JAAS Subject rather than UGI (which will become an internal artifact). While we are adding the user-to-group mapping service, I propose we change the IPC Client to send the JAAS Subject in the header rather than UGI, this will also be compatible with the way we will do Kerberos-based authentication via the GSS API.

> Add a user to groups mapping service 
> -------------------------------------
>
>                 Key: HADOOP-4656
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4656
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 0.19.0
>            Reporter: Arun C Murthy
>             Fix For: 0.20.0
>
>
> 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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