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  1. Hadoop Map/Reduce
  2. MAPREDUCE-1372

ConcurrentModificationException in JobInProgress

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Details

    • Bug
    • Status: Closed
    • Blocker
    • Resolution: Fixed
    • 0.20.1
    • 0.20.3, 0.21.0
    • jobtracker
    • None
    • Reviewed

    Description

      We have seen the following ConcurrentModificationException in one of our clusters

      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)
      

      Attachments

        1. M1372-0.patch
          2 kB
          Christopher Douglas
        2. M1372-1.patch
          0.8 kB
          Christopher Douglas
        3. M1372-2.patch
          3 kB
          Amareshwari Sriramadasu
        4. M1372-2.patch
          3 kB
          Arun Murthy
        5. mapreduce-1372--2010-05-08.patch
          3 kB
          Dick King
        6. ReadOnly.java
          4 kB
          Amar Kamat

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              dking Dick King
              amareshwari Amareshwari Sriramadasu
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              Dates

                Created:
                Updated:
                Resolved: