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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1372) ConcurrentModificationException in JobInProgress
Date Tue, 12 Jan 2010 08:30:54 GMT
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
            Priority: Critical
             Fix For: 0.21.0


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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