[
https://issues.apache.org/jira/browse/HADOOP-2263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544893
]
stack commented on HADOOP-2263:
-------------------------------
Happened again:
{code}
2007-11-22 19:01:35,337 INFO org.apache.hadoop.ipc.Server: IPC Server handler 6
on 60000, call regionServerReport(address: 208.76.45.190:60020, startcode:
6899830976673084046, load: (requests: 0 regions: 17),
[Lorg.apache.hadoop.hbase.HMsg;@6c1989b5) from 208.76.45.190:53517: error:
java.io.IOException: java.util.ConcurrentModificationException
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$EntryIterator.next(Unknown Source)
at org.apache.hadoop.hbase.HMaster.getRegionsToAssign(HMaster.java:1739)
at org.apache.hadoop.hbase.HMaster.assignRegions(HMaster.java:1597)
at org.apache.hadoop.hbase.HMaster.processMsgs(HMaster.java:1582)
at org.apache.hadoop.hbase.HMaster.regionServerReport(HMaster.java:1400)
at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:379)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
2007-11-22 19:01:35,337 INFO org.apache.hadoop.ipc.Server: IPC Server handler 8
on 60000, call regionServerReport(address: 208.76.45.133:60020, startcode:
15832095071232930, load: (requests: 50 regions: 0),
[Lorg.apache.hadoop.hbase.HMsg;@8c3c315) from 208.76.45.133:46925: error:
java.io.IOException: java.util.ConcurrentModificationException
java.io.IOException: java.util.ConcurrentModificationException
at java.util.HashMap$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.GeneratedMethodAccessor19.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)
...
{code}
> [hbase] ConcurrentModificationException on regionserver startup
> ---------------------------------------------------------------
>
> 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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