[HADOOP-12838] Add metrics for LDAP-specific group mapping resolution time

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.8.0
• Labels: LDAP metrics supportability
• Assignee: Wei-Chiu Chuang
• Reporter: Wei-Chiu Chuang
• Created: 24/Feb/16 18:58
• Updated: 26/Feb/16 05:10

Description

LDAP group mapping needs to communicate with a LDAP server. Sometime it takes extremely long time to communicate and resolve group mapping. As a result, system performance degrades and it is not obvious why it goes worse without an in-depth investigation.

Let's add a Metrics for LDAP group mapping and log the resolution time to help debugging.

Issue Links

• relates to: HADOOP-12785 [Handling exceptions] LdapGroupsMapping.getGroups() do not provide information about root cause