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https://issues.apache.org/jira/browse/MAPREDUCE-1136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-1136.
-----------------------------------------
Resolution: Fixed
Likely stale.
> 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
> Affects Versions: 0.20.2, 0.21.0, 0.22.0
> Reporter: Qi Liu
> Attachments: MAPREDUCE-1136.0.18.3.patch, MAPREDUCE-1136.patch
>
>
> 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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