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Date: Wed, 5 Oct 2011 12:59:34 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-2531)
 org.apache.hadoop.mapred.jobcontrol.getAssignedJobID throw class cast
 exception
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-2531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120918#comment-13120918 ] 

Hudson commented on MAPREDUCE-2531:
-----------------------------------

Integrated in Hadoop-Mapreduce-22-branch #80 (See [https://builds.apache.org/job/Hadoop-Mapreduce-22-branch/80/])
    MAPREDUCE-2531. Fixed jobcontrol to downgrade JobID. Contributed by Robert Evans.

shv : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1179063
Files : 
* /hadoop/common/branches/branch-0.22/mapreduce/CHANGES.txt
* /hadoop/common/branches/branch-0.22/mapreduce/src/java/org/apache/hadoop/mapred/jobcontrol/Job.java
* /hadoop/common/branches/branch-0.22/mapreduce/src/test/mapred/org/apache/hadoop/mapred/jobcontrol/TestJobControl.java

                
> org.apache.hadoop.mapred.jobcontrol.getAssignedJobID throw class cast exception 
> --------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2531
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2531
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.22.0
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>            Priority: Blocker
>             Fix For: 0.22.0, 0.23.0
>
>         Attachments: MR-2531-V1-trunk.patch, MR-2531-yarn-v1.patch
>
>
> When using a combination of the mapred and mapreduce APIs (PIG) it is possible to have the following exception
> Caused by: java.lang.ClassCastException: org.apache.hadoop.mapreduce.JobID cannot be cast to
> org.apache.hadoop.mapred.JobID
>         at org.apache.hadoop.mapred.jobcontrol.Job.getAssignedJobID(Job.java:71)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:239)
>         at org.apache.pig.PigServer.launchPlan(PigServer.java:1325)
>         ... 29 more
> This is because the JobID is just downcast.  It should be calling JobID.downgrade

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