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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2531) org.apache.hadoop.mapred.jobcontrol.getAssignedJobID throw class cast exception
Date Thu, 26 May 2011 18:29:47 GMT

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

Robert Joseph Evans updated MAPREDUCE-2531:
-------------------------------------------

    Attachment: MR-2531-yarn-v1.patch

Attached is the yarn patch.  The test is still under ant, even though the code has been moved
to mvn.  Not sure if this is an issue or not.  Also not all of the ant contrib tests even
compile.  My test runs and passes though.

> 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
>             Fix For: 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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