fengyongshe created HADOOP-15976:
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             Summary: 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
            Reporter: fengyongshe


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

ps. The Server was running nslcd 

 



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