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https://issues.apache.org/jira/browse/HADOOP-8943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14041966#comment-14041966
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Kai Zheng commented on HADOOP-8943:
-----------------------------------

Brandon, 

I updated the patch regarding the comment. As I'm a little not comfortable 
about introducing the dependency to fs related package for hadoop security 
facilities by this, I didn't use the CommonConfigurationKeysPublic. Thanks.

> Support multiple group mapping providers
> ----------------------------------------
>
>                 Key: HADOOP-8943
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8943
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>             Fix For: 2.5.0
>
>         Attachments: HADOOP-8943.patch, HADOOP-8943.patch, HADOOP-8943.patch, 
> hadoop-8943-v2.patch, hadoop-8943-v3.patch
>
>   Original Estimate: 504h
>  Remaining Estimate: 504h
>
>   Discussed with Natty about LdapGroupMapping, we need to improve it so that: 
> 1. It's possible to do different group mapping for different 
> users/principals. For example, AD user should go to LdapGroupMapping service 
> for group, but service principals such as hdfs, mapred can still use the 
> default one ShellBasedUnixGroupsMapping; 
> 2. Multiple ADs can be supported to do LdapGroupMapping; 
> 3. It's possible to configure what kind of users/principals (regarding 
> domain/realm is an option) should use which group mapping service/mechanism.
> 4. It's possible to configure and combine multiple existing mapping providers 
> without writing codes implementing new one.



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