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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1178) MultipleInputs fails with ClassCastException
Date Tue, 03 Nov 2009 06:52:59 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Amareshwari Sriramadasu updated MAPREDUCE-1178:

    Attachment: patch-1178.txt

patch adds a DelegatingRecordReader which calls underlying record-reader methods for a split.
Thanks Jay for the testcase. Testcase passes with the patch.

> MultipleInputs fails with ClassCastException 
> ---------------------------------------------
>                 Key: MAPREDUCE-1178
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1178
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.21.0
>            Reporter: Jay Booth
>            Priority: Blocker
>             Fix For: 0.21.0
>         Attachments: MAPREDUCE-1178.patch, patch-1178.txt
> When running MultipleInputs against the new API, we get failures with this ClassCastException:
> java.lang.ClassCastException: org.apache.hadoop.mapreduce.lib.input.TaggedInputSplit
cannot be cast to org.apache.hadoop.mapreduce.lib.input.FileSplit
> 	at org.apache.hadoop.mapreduce.lib.input.LineRecordReader.initialize(LineRecordReader.java:70)
> 	at org.apache.hadoop.mapreduce.lib.input.KeyValueLineRecordReader.initialize(KeyValueLineRecordReader.java:59)
> 	at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:439)
> 	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:599)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:323)
> 	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:257)
> The unit test for MultipleInputs doesn't actually run a job so this snuck through while
still passing the unit test.  Attached patch fixes the unit test to expose the failure and
does a little casting kung-fu in LineRecordReader to avoid the error.

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