Details
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Bug
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Status: Resolved
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Major
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Resolution: Not A Problem
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0.20.203.0
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None
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None
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None
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cdh3u1 hadoop distribution, centos 5.5.
Description
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)
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.