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https://issues.apache.org/jira/browse/MAPREDUCE-4848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13549100#comment-13549100
]
Jason Lowe commented on MAPREDUCE-4848:
---------------------------------------
+1 lgtm.
> TaskAttemptContext cast error during AM recovery
> ------------------------------------------------
>
> Key: MAPREDUCE-4848
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4848
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mr-am
> Affects Versions: 0.23.4
> Reporter: Jason Lowe
> Assignee: Jerry Chen
> Fix For: trunk
>
> Attachments: MAPREDUCE-4848.patch
>
>
> Recently saw an AM that failed and tried to recover, but the subsequent
> attempt quickly exited with its own failure during recovery:
> {noformat}
> 2012-12-05 02:33:36,752 FATAL [AsyncDispatcher event handler]
> org.apache.hadoop.yarn.event.AsyncDispatcher: Error in dispatcher thread
> java.lang.ClassCastException:
> org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl cannot be cast to
> org.apache.hadoop.mapred.TaskAttemptContext
> at
> org.apache.hadoop.mapred.OutputCommitter.recoverTask(OutputCommitter.java:284)
> at
> org.apache.hadoop.mapreduce.v2.app.recover.RecoveryService$InterceptingEventHandler.handle(RecoveryService.java:361)
> at
> org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl$ContainerAssignedTransition.transition(TaskAttemptImpl.java:1211)
> at
> org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl$ContainerAssignedTransition.transition(TaskAttemptImpl.java:1177)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:357)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:298)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:43)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:443)
> at
> org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl.handle(TaskAttemptImpl.java:958)
> at
> org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl.handle(TaskAttemptImpl.java:135)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$TaskAttemptEventDispatcher.handle(MRAppMaster.java:926)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$TaskAttemptEventDispatcher.handle(MRAppMaster.java:918)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:126)
> at
> org.apache.hadoop.mapreduce.v2.app.recover.RecoveryService$RecoveryDispatcher.realDispatch(RecoveryService.java:285)
> at
> org.apache.hadoop.mapreduce.v2.app.recover.RecoveryService$RecoveryDispatcher.dispatch(RecoveryService.java:281)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:75)
> at java.lang.Thread.run(Thread.java:619)
> 2012-12-05 02:33:36,752 INFO [AsyncDispatcher event handler]
> org.apache.hadoop.yarn.event.AsyncDispatcher: Exiting, bbye..
> {noformat}
> The RM then launched a third AM attempt which succeeded. The third attempt
> saw basically no progress after parsing the history file from the second
> attempt and ran the job again from scratch.
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