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https://issues.apache.org/jira/browse/HBASE-2169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12805840#action_12805840
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Lars George commented on HBASE-2169:
------------------------------------
See http://www.scribd.com/doc/25448092/Racing-Toward-Disaster (Page 79): Use
java.util.concurrent.CopyOnWriteArrayList()?
> CME in master regionsAwaitingAssignment
> ---------------------------------------
>
> Key: HBASE-2169
> URL: https://issues.apache.org/jira/browse/HBASE-2169
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.3
> Reporter: stack
>
> Got this in a regionserver log:
> {code}
> 3970 java.io.IOException: java.io.IOException:
> java.util.ConcurrentModificationException
> 3971 at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
> 3972 at java.util.TreeMap$ValueIterator.next(TreeMap.java:1145)
> 3973 at
> org.apache.hadoop.hbase.master.RegionManager.regionsAwaitingAssignment(RegionManager.java:415)
> 3974 at
> org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:196)
> 3975 at
> org.apache.hadoop.hbase.master.ServerManager.processMsgs(ServerManager.java:482)
> 3976 at
> org.apache.hadoop.hbase.master.ServerManager.processRegionServerAllsWell(ServerManager.java:414)
> 3977 at
> org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:323)
> 3978 at
> org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:724)
> 3979 at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
> 3980 at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 3981 at java.lang.reflect.Method.invoke(Method.java:597)
> 3982 at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:652)
> 3983 at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
> 3984
> 3985 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
> 3986 at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> 3987 at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> 3988 at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> 3989 at
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:94)
> 3990 at
> org.apache.hadoop.hbase.RemoteExceptionHandler.checkThrowable(RemoteExceptionHandler.java:48)
> 3991 at
> org.apache.hadoop.hbase.RemoteExceptionHandler.checkIOException(RemoteExceptionHandler.java:66)
> 3992 at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:574)
> 3993 at java.lang.Thread.run(Thread.java:619)
> {code}
> The regionserver was crashing and burning at the time but still.
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