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Posted to dev@hbase.apache.org by "Lars George (JIRA)" <ji...@apache.org> on 2009/09/02 12:48:33 UTC
[jira] Assigned: (HBASE-1810) ConcurrentModificationException in
region assignment
[ https://issues.apache.org/jira/browse/HBASE-1810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars George reassigned HBASE-1810:
----------------------------------
Assignee: Mathias Herberts
> ConcurrentModificationException in region assignment
> ----------------------------------------------------
>
> Key: HBASE-1810
> URL: https://issues.apache.org/jira/browse/HBASE-1810
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Lars George
> Assignee: Mathias Herberts
> Fix For: 0.20.1
>
> Attachments: HBASE-1810.patch
>
>
> {code}
> 2009-09-01 11:28:24,106 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 16 on 60000, call regionServerReport(address: 192.168.105.39:60020, startcode: 1251828463043, load: (requests=0, regions=21, usedHeap=135, maxHeap=4093), [Lorg.apache.hadoop.hbase.HMsg;@6556c280, [Lorg.apache.hadoop.hbase.HRegionInfo;@22fb957a) from 192.168.105.39:60281: error: java.io.IOException: java.util.ConcurrentModificationException
> 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.isMetaServer(RegionManager.java:837)
> at org.apache.hadoop.hbase.master.RegionManager.regionsAwaitingAssignment(RegionManager.java:405)
> at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:202)
> at org.apache.hadoop.hbase.master.ServerManager.processMsgs(ServerManager.java:481)
> at org.apache.hadoop.hbase.master.ServerManager.processRegionServerAllsWell(ServerManager.java:415)
> at org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:324)
> at org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:722)
> at sun.reflect.GeneratedMethodAccessor4.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$Server.call(HBaseRPC.java:650)
> at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
> {code}
> and
> {code}
> 2009-09-01 11:28:25,713 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 23 on 60000, call regionServerReport(address: 192.168.105.37:60020, startcode: 1251828463132, load: (requests=0, regions=14, usedHeap=141, maxHeap=4093), [Lorg.apache.hadoop.hbase.HMsg;@68345260, [Lorg.apache.hadoop.hbase.HRegionInfo;@430c5212) from 192.168.105.37:35432: error: java.io.IOException: java.util.ConcurrentModificationException
> 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.regionsAwaitingAssignment(RegionManager.java:428)
> at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:202)
> at org.apache.hadoop.hbase.master.ServerManager.processMsgs(ServerManager.java:481)
> at org.apache.hadoop.hbase.master.ServerManager.processRegionServerAllsWell(ServerManager.java:415)
> at org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:324)
> at org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:722)
> at sun.reflect.GeneratedMethodAccessor4.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$Server.call(HBaseRPC.java:650)
> at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
> {code}
> As discussed with Mathias on IRC:
> <hbs> regionsInTransition is a synchronized map so accesses to it are synchronized but not looping over it
> <hbs> as stated in http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collections.html#synchronizedMap%28java.util.Map%29
> <hbs> so there is a missing synchronized(regionsInTransition) wherever regionsInTransition is iterated over.
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