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From Bejoy Ks <bejoy.had...@gmail.com>
Subject Re: Reading fields from a Text line
Date Thu, 02 Aug 2012 23:11:43 GMT
Hi Tariq

On further analysis I noticed a odd behavior in this context.

If we use the default InputFormat (TextInputFormat) but specify the Key
type in mapper as IntWritable instead of Long Writable. The framework is
supposed throw a class cast exception.Such an exception is thrown only if
the key types at class level and method level are the same (IntWritable) in
Mapper. But if we provide the Input key type as IntWritable on the class
level but LongWritable on the method level (map method), instead of
throwing a compile time error, the code compliles fine . In addition to it
on execution the framework triggers Identity Mapper instead of the custom
mapper provided with the configuration.

This seems like a bug to me . Filed a jira to track this issue
https://issues.apache.org/jira/browse/MAPREDUCE-4507


Regards
Bejoy KS

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