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Date: Wed, 12 May 2010 04:04:43 -0400 (EDT)
From: "Amareshwari Sriramadasu (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1372) ConcurrentModificationException
 in JobInProgress
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866499#action_12866499 ] 

Amareshwari Sriramadasu commented on MAPREDUCE-1372:
----------------------------------------------------

Patch for trunk/0.21 :  	mapreduce-1372--2010-05-08.patch looks good to me.

> ConcurrentModificationException in JobInProgress
> ------------------------------------------------
>
>                 Key: MAPREDUCE-1372
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1372
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.20.1
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Dick King
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: M1372-0.patch, M1372-1.patch, M1372-2.patch, M1372-2.patch, mapreduce-1372--2010-05-08.patch, ReadOnly.java
>
>
> We have seen the following  ConcurrentModificationException in one of our clusters
> {noformat}
> java.io.IOException: java.util.ConcurrentModificationException
>         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
>         at java.util.HashMap$KeyIterator.next(HashMap.java:828)
>         at org.apache.hadoop.mapred.JobInProgress.findNewMapTask(JobInProgress.java:2018)
>         at org.apache.hadoop.mapred.JobInProgress.obtainNewMapTask(JobInProgress.java:1077)
>         at org.apache.hadoop.mapred.CapacityTaskScheduler$MapSchedulingMgr.obtainNewTask(CapacityTaskScheduler.java:796)
>         at org.apache.hadoop.mapred.CapacityTaskScheduler$TaskSchedulingMgr.getTaskFromQueue(CapacityTaskScheduler.java:589)
>         at org.apache.hadoop.mapred.CapacityTaskScheduler$TaskSchedulingMgr.assignTasks(CapacityTaskScheduler.java:677)
>         at org.apache.hadoop.mapred.CapacityTaskScheduler$TaskSchedulingMgr.access$500(CapacityTaskScheduler.java:348)
>         at org.apache.hadoop.mapred.CapacityTaskScheduler.addMapTask(CapacityTaskScheduler.java:1397)
>         at org.apache.hadoop.mapred.CapacityTaskScheduler.assignTasks(CapacityTaskScheduler.java:1349)
>         at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:2976)
>         at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:597)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959)
>         at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953)
> {noformat}

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