title: Hadoop: Where the mapper output stored (local or HDFS) if no reducer job available?
body: <p>In Hadoop, all mapper outputs are stored in local disk (not in HDFS). It is possible that any Hadoop job can have zero reducer. </p>
  
  <p>In this case, the mapper output still be stored in local disk? What about reliability if the output is stored in local disk? Is there any way to store the mapper output on HDFS if no reducer available?</p>
  
  <p>Thanks and Regards,
  KB Devaraj </p>