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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