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https://issues.apache.org/jira/browse/HADOOP-12838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15166365#comment-15166365
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Wei-Chiu Chuang commented on HADOOP-12838:
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Ok. So there's a metrics for group mapping resolution in general. But it seems
we may need a more detailed metrics/ logging to know how many timeouts have
resulted. Also, since a typical LDAP group resolution requires two LDAP
queries, It may need to log the latency of both queries.
> Add metrics for LDAP-specific group mapping resolution time
> -----------------------------------------------------------
>
> Key: HADOOP-12838
> URL: https://issues.apache.org/jira/browse/HADOOP-12838
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.8.0
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Labels: LDAP, metrics, supportability
>
> 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.
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