title: How to generate Multiple File names in runtime in HADOOP?
body: <p>I have some data in csv format.</p>
  
  <p>eg K1,K2,data1,data2,data3</p>
  
  <p>here my mapper passes the key to reducer as K1K2
                         &amp; Value as data1,data2,data3</p>
  
  <p>I wanted to save this data in Multiple Files with file name being K1k2(or the key which reducer gets). Now If I'm using MultipleOutputs class, I have to mention the file names before mapper begins. But here , since only after reading the data from mapper, I can determine the key. How should i proceed?</p>
  
  <p>PS I'm new to this.</p>