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From "Alexey Zotov (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3969) ConcurrentModificationException in JobHistory.java
Date Mon, 05 Mar 2012 06:13:04 GMT
ConcurrentModificationException in JobHistory.java
--------------------------------------------------

                 Key: MAPREDUCE-3969
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3969
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.20.2
         Environment: cdh3u1 hadoop distribution, centos 5.5.
            Reporter: Alexey Zotov


<code>
2012-03-01 04:24:47,479 INFO org.apache.hadoop.mapred.JobInProgress: Task 'attempt_201202150320_3709_m_000148_0'
has completed task_201202150320_3709_m_000148 successfully.
2012-03-01 04:24:47,479 INFO org.apache.hadoop.mapred.JobHistory: Logging failed for job job_201202150320_3709removing
PrintWriter from FileManager
2012-03-01 04:24:47,479 INFO org.apache.hadoop.ipc.Server: IPC Server handler 5 on 8021, call
heartbeat(org.apache.hadoop.mapred.TaskTrackerStatus@61069281, false, false, true, -21317)
from <TASKTRACKER-IP>:450
41: error: java.io.IOException: java.util.ConcurrentModificationException
java.io.IOException: java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at org.apache.hadoop.mapred.JobHistory.log(JobHistory.java:591)
        at org.apache.hadoop.mapred.JobHistory$MapAttempt.logFinished(JobHistory.java:1735)
        at org.apache.hadoop.mapred.JobInProgress.completedTask(JobInProgress.java:2515)
        at org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:1200)
        at org.apache.hadoop.mapred.JobTracker.updateTaskStatuses(JobTracker.java:4539)
        at org.apache.hadoop.mapred.JobTracker.processHeartbeat(JobTracker.java:3503)
        at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:3202)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1434)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1430)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1127)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1428)
</code>

Task task_201202150320_3709_m_000148 was being marked as failed (but had not been restarted)
at that moment and job execution was being freezed.

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