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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2531) org.apache.hadoop.mapred.jobcontrol.getAssignedJobID throw class cast exception
Date Tue, 24 May 2011 16:07:48 GMT
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

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
        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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