mapreduce - How complex can a Hadoop Map Reduce program be? -

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two basic general questions, hope can clarify:

  • does every program executed via hadoop has written in map/reduce format?
  • how complex can programs be? (is theoretically possible run program via hadoop?)

your first question:yes because hadoop uses map/reduce model,but can use map function in problem,for example sorting!

your second question:no hadoop can not everything,because use map/reduce model,some program can not resolved map/reduce,like nested program,so companies developed many other program models pregel, dremel , on!


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