Kai Zheng created HADOOP-8943:
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             Summary: Enable to support multiple ADs and different group 
mapping for different user
                 Key: HADOOP-8943
                 URL: https://issues.apache.org/jira/browse/HADOOP-8943
             Project: Hadoop Common
          Issue Type: Improvement
          Components: security
            Reporter: Kai Zheng
             Fix For: 2.0.3-alpha


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.


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