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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4848) TaskAttemptContext cast error during AM recovery
Date Tue, 08 Jan 2013 08:30:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546697#comment-13546697
] 

Hadoop QA commented on MAPREDUCE-4848:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12563716/MAPREDUCE-4848.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3208//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3208//console

This message is automatically generated.
                
> 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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