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https://issues.apache.org/jira/browse/HADOOP-12793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15148898#comment-15148898
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Wei-Chiu Chuang commented on HADOOP-12793:
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Hi [~iwasakims] that's a good suggestion. A lot of things mentioned in HDFS 
Permissions Guide is not under hadoop-hdfs-project.

I am actually rewriting this section as a new page. Hadoop in Secure Mode does 
not look to be the best place for this section though. I'll make a revision 
later.


Thanks!

> Introduce undocumented group mapping implementations in HDFS Permissions Guide
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-12793
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12793
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 2.7.2
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>              Labels: ldap, supportability
>         Attachments: HADOOP-12791.001.patch
>
>
> LdapGroupsMapping has lots of configurable properties and is thus fairly 
> complex in nature. _HDFS Permissions Guide_ has a minimal introduction to 
> LdapGroupsMapping, with reference to "More information on configuring the 
> group mapping service is available in the Javadocs."
> However, its Javadoc provides no information about how to configure it. 
> Core-default.xml has descriptions for each property, but still lacks a 
> comprehensive tutorial. Without a tutorial/guide, these configurable 
> properties would be buried under the sea of properties.
> Both Cloudera and HortonWorks has some information regarding LDAP group 
> mapping:
> http://www.cloudera.com/documentation/enterprise/latest/topics/cm_sg_ldap_grp_mappings.html
> http://hortonworks.com/blog/hadoop-groupmapping-ldap-integration/
> But neither cover all configurable features, such as using SSL with LDAP, and 
> POSIX group semantics.



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