title: How to implement multiple reducers in a single MapReduce Job
body: <p>I'm having a huge data set and I need to perform different functions for the same data.
      I would like to have four output files. Since four operations are different, can I use four <em>partitioners</em> and four <em>reducers</em> to implement the same ? Is it possible or should I need to write four jobs to perform this ?  Please help me !</p>