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https://issues.apache.org/jira/browse/HADOOP-2263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544914
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Jim Kellerman commented on HADOOP-2263:
---------------------------------------
Hadoop-patch build #1143 a similar problem:
{code}
[junit] 2007-11-23 01:23:02,779 FATAL [RegionServer:0.cacheFlusher]
org.apache.hadoop.hbase.HRegionServer$1.uncaughtException(HRegionServer.java:887):
Set stop flag in RegionServer:0.cacheFlusher
[junit] java.util.ConcurrentModificationException
[junit] at
java.util.PriorityQueue$Itr.checkForComodification(PriorityQueue.java:456)
[junit] at java.util.PriorityQueue$Itr.next(PriorityQueue.java:412)
[junit] at java.util.concurrent.DelayQueue$Itr.next(DelayQueue.java:395)
[junit] at
java.util.AbstractCollection.contains(AbstractCollection.java:101)
[junit] at
org.apache.hadoop.hbase.HRegionServer$Flusher.run(HRegionServer.java:487)
[junit] 2007-11-23 01:23:02,780 DEBUG [RegionServer:0.compactor]
org.apache.hadoop.hbase.HStore.completeCompaction(HStore.java:1364): moving
1996951076/info/-1 in /hbase/compaction.dir to
1996951076/info/7827035655061474734 in /hbase
[junit] 2007-11-23 01:23:02,883 DEBUG [main]
org.apache.hadoop.hbase.HTable.commit(HTable.java:739): reloading table servers
because: java.io.IOException: Server not running
[junit] at
org.apache.hadoop.hbase.HRegionServer.checkOpen(HRegionServer.java:1493)
[junit] at
org.apache.hadoop.hbase.HRegionServer.batchUpdate(HRegionServer.java:1310)
[junit] at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
[junit] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[junit] at java.lang.reflect.Method.invoke(Method.java:585)
[junit] at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:379)
[junit] 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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