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https://issues.apache.org/jira/browse/HBASE-599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Kellerman resolved HBASE-599.
---------------------------------
Resolution: Fixed
Committed with patch for HBASE-478
> CME iterating return from ServerManager.getMarkedToClose
> --------------------------------------------------------
>
> Key: HBASE-599
> URL: https://issues.apache.org/jira/browse/HBASE-599
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Assignee: Jim Kellerman
> Priority: Critical
> Fix For: 0.2.0
>
>
> Below is a note from list from David Alves
> {code}
> I'm seeing some CMEs in the logs they occurred while I still had bad
> dfs.replication settings between hadoop and hbase but still thought you
> should know.
> Trace:
> 2008-04-21 13:20:46,443 WARN
> org.apache.hadoop.hbase.regionserver.HRegionServer: Processing message
> (Retry: 0)
> java.io.IOException: java.io.IOException:
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$ValueIterator.next(HashMap.java:822)
> at
> org.apache.hadoop.hbase.master.ServerManager.processMsgs(ServerManager.java:350)
> at
> org.apache.hadoop.hbase.master.ServerManager.processRegionServerAllsWell(ServerManager.java:299)
> at
> org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:217)
> at
> org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:560)
> at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:413)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:82)
> at
> org.apache.hadoop.hbase.RemoteExceptionHandler.checkIOException(RemoteExceptionHandler.java:48)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:388)
> at java.lang.Thread.run(Thread.java:619)
> {code}
> Looking at it, the fix would seem to be cloning the Map we give out but the
> clone needs to be done inside a synchronize of the Map being cloned so some
> more extensive synchronizing needs to be added to the ServerManager class.
> Looking too, it seems like regionsToClose is not protected everywhere (maybe
> I'm not reading it right).
> Bryan, you'd probably be best handlng this issue.
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