[hbase] ConcurrentModificationException on regionserver startup
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Key: HADOOP-2263
URL: https://issues.apache.org/jira/browse/HADOOP-2263
Project: Hadoop
Issue Type: Bug
Components: contrib/hbase
Reporter: stack
Priority: Minor
Saw this in aRegionServer log on startup (RegionServer had tens of regions).
{code}
2007-11-22 00:17:33,622 INFO org.apache.hadoop.hbase.HRegionServer:
HRegionServer started at: 208.76.45.216:60020
2007-11-22 00:17:33,622 INFO org.apache.hadoop.ipc.Server: IPC Server handler 9
on 60020: starting
2007-11-22 00:17:33,644 INFO org.apache.hadoop.hbase.HRegionServer:
MSG_REGION_OPEN : regionname: -ROOT-,,0, startKey: <>, tableDesc: {name:
-ROOT-, families: {info:={name: info, max versions: 1, compression: NONE, in
memory: false, max length: 2147483647, bloom filter: none}}}
2007-11-22 00:17:33,712 INFO org.apache.hadoop.hbase.HRegion: region -ROOT-,,0
available
2007-11-22 00:17:42,704 WARN org.apache.hadoop.hbase.HRegionServer: Processing
message (Retry: 0)
java.io.IOException: java.io.IOException:
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
at java.util.HashMap$EntryIterator.next(Unknown Source)
at java.util.HashMap$EntryIterator.next(Unknown Source)
at org.apache.hadoop.hbase.HMaster.getRegionsToAssign(HMaster.java:1739)
at org.apache.hadoop.hbase.HMaster.assignRegions(HMaster.java:1597)
at org.apache.hadoop.hbase.HMaster.processMsgs(HMaster.java:1582)
at org.apache.hadoop.hbase.HMaster.regionServerReport(HMaster.java:1400)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:379)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
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.HRegionServer.run(HRegionServer.java:532)
at java.lang.Thread.run(Unknown Source)
...
{code}
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