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Hadoop, mail # user - Right way to implement MR ?

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Right way to implement MR ?
samir das mohapatra 2012-05-23, 19:47
Hi All,
     How to compare to input file In M/R Job.
     let A Log file around 30GB
    and B Log file size is around 60 GB

  I wanted to know how  i will  define <K,V> inside the mapper.