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https://issues.apache.org/jira/browse/HADOOP-12793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15146937#comment-15146937
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Masatake Iwasaki commented on HADOOP-12793:
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Thanks for working on this, [~jojochuang]. The updated contents looks good.

Because described modules are under hadoop-common, how about moving contents to 
"Mapping from user to group" section of 
hadoop-common-project/hadoop-common/src/site/markdown/SecureMode.md and 
referring it from HdfsPermissionsGuide.md? (Currently SecureMode.md refers to 
HdfsPermissionGuide.md.)


> 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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