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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2309) [hbase] ConcurrentModificationException doing get of all region start keys
Date Sun, 02 Dec 2007 12:06:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12547615
] 

Hudson commented on HADOOP-2309:
--------------------------------

Integrated in Hadoop-Nightly #320 (See [http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/320/])

> [hbase] ConcurrentModificationException doing get of all region start keys
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-2309
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2309
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.16.0
>            Reporter: stack
>            Assignee: Jim Kellerman
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: patch.txt, patch.txt, patch.txt, patch.txt
>
>
> Reported by Paul Saab:
> {code}
> I'm getting the following exception when getting the start key from every table.  If
I try to grab it again, it will succeed.  Is this a bug or do you need to catch these sort
of exceptions in my code?...
> Looking for key: img529/6013/46da7e3f111daje2.jpg
> Exception in thread "main" java.io.IOException: java.io.IOException: java.util.ConcurrentModificationException
>     at java.util.TreeMap$NavigableSubMap$SubMapIterator.nextEntry (TreeMap.java:1572)
>     at java.util.TreeMap$NavigableSubMap$SubMapEntryIterator.next(TreeMap.java:1620)
>     at java.util.TreeMap$NavigableSubMap$SubMapEntryIterator.next(TreeMap.java:1614)
>     at org.apache.hadoop.hbase.HStore$Memcache.internalGet (HStore.java:223)
>     at org.apache.hadoop.hbase.HStore$Memcache.get(HStore.java:152)
>     at org.apache.hadoop.hbase.HStore.get(HStore.java:1490)
>     at org.apache.hadoop.hbase.HRegion.get(HRegion.java:1002)
>     at org.apache.hadoop.hbase.HRegion.get(HRegion.java:959)
>     at org.apache.hadoop.hbase.HRegionServer.get(HRegionServer.java:1233)
>     at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
>     at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     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(NativeConstructorAccessorImpl.java:39)
>     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance (DelegatingConstructorAccessorImpl.java:27)
>     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>     at org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java
:82)
>     at org.apache.hadoop.hbase.HTable.get(HTable.java:202)
>     at us.imageshack.hbase.ListRegions.run(ListRegions.java:25)
>     at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
>     at us.imageshack.hbase.ListRegions.main (ListRegions.java:38)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>     at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     at org.apache.hadoop.util.RunJar.main(RunJar.java:155)
> {code}

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