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
Fix For: 0.20.1
{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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