fengyongshe created HADOOP-15976: ------------------------------------ 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 -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-dev-h...@hadoop.apache.org