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https://issues.apache.org/jira/browse/MAPREDUCE-2531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120705#comment-13120705
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Po Cheung commented on MAPREDUCE-2531:
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Tested trunk patch against 0.22 and it passed. Please commit to 0.22.
> 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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