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Posted to mapreduce-issues@hadoop.apache.org by "Vinod K V (JIRA)" <ji...@apache.org> on 2009/10/23 05:50:00 UTC
[jira] Commented: (MAPREDUCE-1136) ConcurrentModificationException
when tasktracker updates task status to jobtracker
[ https://issues.apache.org/jira/browse/MAPREDUCE-1136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769047#action_12769047 ]
Vinod K V commented on MAPREDUCE-1136:
--------------------------------------
This can happen on trunk too, albeit for a different reason.
> ConcurrentModificationException when tasktracker updates task status to jobtracker
> ----------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1136
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1136
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Reporter: Qi Liu
>
> In Hadoop 0.18.3, the following exception happened during a job execution. It does not happen often.
> Here is the stack trace of the exception.
> org.apache.hadoop.ipc.RemoteException: 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.mapred.JobTracker.getAllJobs(JobTracker.java:2376)
> at sun.reflect.GeneratedMethodAccessor32.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$Server.call(RPC.java:481)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:890)
> org.apache.hadoop.ipc.Client.call(Client.java:716)
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