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From "Konstantin Shvachko (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2531) org.apache.hadoop.mapred.jobcontrol.getAssignedJobID throw class cast exception
Date Tue, 04 Oct 2011 21:07:34 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated MAPREDUCE-2531:
-------------------------------------------

         Priority: Blocker  (was: Major)
    Fix Version/s: 0.22.0
    
> 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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