[HADOOP-12947] Update documentation Hadoop Groups Mapping to add static group mapping, negative cache

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7.2
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: documentation, security
• Assignee: Wei-Chiu Chuang
• Reporter: Wei-Chiu Chuang
• Created: 21/Mar/16 16:32
• Updated: 30/Aug/16 01:17
• Resolved: 23/Mar/16 21:57

Description

After Hadoop Group Mapping was written, I subsequently found a number of other things that should be added/updated:

1. static group mapping, statically map users to group names (HADOOP-10142)
2. negative cache, to avoid spamming NameNode with invalid user names (HADOOP-10755)
3. update query pattern for LDAP groups mapping if posix semantics is supported. (HADOOP-9477)