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Andrei Dragomir commented on HBASE-2169: ---------------------------------------- Probably related; we also have an entry in a log with a CME java.io.IOException: java.io.IOException: java.util.ConcurrentModificationException at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100) at java.util.TreeMap$ValueIterator.next(TreeMap.java:1145) at org.apache.hadoop.hbase.master.RegionManager.isRootServerCandidate(RegionManager.java:834) at org.apache.hadoop.hbase.master.ServerManager.removeServerInfo(ServerManager.java:641) at org.apache.hadoop.hbase.master.ServerManager.processRegionServerExit(ServerManager.java:323) at org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:247) at org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:729) at sun.reflect.GeneratedMethodAccessor10.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$Server.call(HBaseRPC.java:648) at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915) 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:94) at org.apache.hadoop.hbase.RemoteExceptionHandler.checkThrowable(RemoteExceptionHandler.java:48) at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:634) at java.lang.Thread.run(Thread.java:619) > 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.