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https://issues.apache.org/jira/browse/HADOOP-15976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16866297#comment-16866297
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Hadoop QA commented on HADOOP-15976:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 7s{color}
| {color:red} HADOOP-15976 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-15976 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12950661/HADOOP-15976.patch |
| Console output |
https://builds.apache.org/job/PreCommit-HADOOP-Build/16326/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> NameNode Performance degradation When Single LdapServer become a bottleneck
> in Ldap-based mapping module
> ----------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-15976
> URL: https://issues.apache.org/jira/browse/HADOOP-15976
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Affects Versions: 3.1.1
> Reporter: fengyongshe
> Assignee: fengyongshe
> Priority: Major
> Attachments: HADOOP-15976.patch, image003(12-05-1(12-05-10-36-26).jpg
>
>
> 2000+ nodes cluster, We use OpenLdap to manager users and groups . when
> LdapGroupsMapping used , Group look-up cause segment fault include NameNode
> Performance degradation & name node crashes .
> WARN security.Groups: Potential performance problem:
> getGroups(user=xxxx) took 46817 milliseconds.
> INFO namenode.FSNamesysatem(FSNamesystemLoclk.java:writeUnlock(252))-
> FSNameSystem write lock held for 46817 ms via java.lang.thread.getStackTrace
> We Found the Ldap Server become the bottleneck for NN operations， Single Ldap
> Server only support hundred request per seconds
> ps. The Server was running nslcd
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