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MapReduce >> mail # user >> Hadoop streaming weird problem

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Hadoop streaming weird problem
   I am facing a weird problem.
My python scripts were working just fine.
I made few modifications..
tested via:
cat input.txt | python mapper.py | sort | python reducer.py

runs just fine

Ran on my local machine (pseudo-distributed mode)
THat also runs just fine

Deployed on clusters..

Now, it runs just fine but all the outputs are blank?

Has anyone else also faced this issue?