[ http://issues.apache.org/jira/browse/HADOOP-751?page=comments#action_12456697 ] dhruba borthakur commented on HADOOP-751: -----------------------------------------
For the records, the namenode been stable after applying Raghu's directio-memory leak fix. > Namenode constantly using up 100% CPU > ------------------------------------- > > Key: HADOOP-751 > URL: http://issues.apache.org/jira/browse/HADOOP-751 > Project: Hadoop > Issue Type: Bug > Components: dfs > Affects Versions: 0.8.0 > Reporter: Koji Noguchi > > Trying to figure out the exact cause, but CPU load of the namenode is > constantly 100% without any file exchanges. > .log file of the namenode showing the following exception about every 20 > seconds. > 2006-11-27 16:02:07,199 INFO org.apache.hadoop.ipc.Server: IPC Server handler > 5 on 8020 call error: java.io.IOException: java.util.NoSuchElementException > java.io.IOException: java.util.NoSuchElementException > at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1029) > at java.util.TreeMap$KeyIterator.next(TreeMap.java:1058) > at java.util.AbstractCollection.toArray(AbstractCollection.java:176) > at > org.apache.hadoop.dfs.DatanodeDescriptor.getBlocks(DatanodeDescriptor.java:96) > at org.apache.hadoop.dfs.FSNamesystem.processReport(FSNamesystem.java:1446) > at org.apache.hadoop.dfs.NameNode.blockReport(NameNode.java:506) > at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:585) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:387) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:518) > On some of the datanodes, .log file is showing > 2006-11-27 16:03:57,542 WARN org.apache.hadoop.dfs.DataNode: > org.apache.hadoop.ipc.RemoteException: java.io.IOException: > java.util.NoSuchElementException > at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1029) > at java.util.TreeMap$KeyIterator.next(TreeMap.java:1058) > at java.util.AbstractCollection.toArray(AbstractCollection.java:176) > at > org.apache.hadoop.dfs.DatanodeDescriptor.getBlocks(DatanodeDescriptor.java:96) > at org.apache.hadoop.dfs.FSNamesystem.processReport(FSNamesystem.java:1446) > at org.apache.hadoop.dfs.NameNode.blockReport(NameNode.java:506) > at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:585) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:387) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:518) > at org.apache.hadoop.ipc.Client$Connection.run(Client.java:248) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
