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From "Jay Booth (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1178) MultipleInputs fails with ClassCastException
Date Mon, 02 Nov 2009 23:08:59 GMT
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

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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