[ https://issues.apache.org/jira/browse/MAPREDUCE-3969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Arun C Murthy resolved MAPREDUCE-3969. -------------------------------------- Resolution: Not A Problem > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira