title: Hadoop one Map and multiple Reduce
body: <p>We have a large dataset to analyze with multiple <strong>reduce</strong> functions.</p>
  
  <p>All <strong>reduce</strong> algorithm work on the same dataset generated by the same <strong>map</strong> function. Reading the large dataset costs too much to do it every time, it would be better to read only once and pass the <strong>mapped</strong> data to multiple <strong>reduce</strong> functions.</p>
  
  <p>Can I do this with Hadoop? I've searched the examples and the intarweb but I could not find any solutions.</p>