I felt doing my Mapper operation in Perl script but then I realized it would be easier to write Reducer in Python. Can Mapper and Reducer can work in different programming language?
Can I write mapper and reducer program in different language
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From the tags it sounds like you're using Amazon's Elastic Map Reduce service. This question is answered in their excellent FAQ:
In other words, anything that can write to a file can be used in an EMR map or reduce step.