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Posted to common-issues@hadoop.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2019/06/18 06:36:00 UTC
[jira] [Commented] (HADOOP-15976) NameNode Performance degradation
When Single LdapServer become a bottleneck in Ldap-based mapping module
[ https://issues.apache.org/jira/browse/HADOOP-15976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16866292#comment-16866292 ]
Wei-Chiu Chuang commented on HADOOP-15976:
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This one looks interesting. [~fengyongshe] I added you to the contributor list and assigned the Jira to you.
[~lukmajercak], [~elgoiri] what do you think?
> 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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