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301.2.7-Shuffle and reduce

 

 

Shuffle & Reduce Stage

  • Reduce stage is the combination of the Shuffle stage and the Reduce stage.
  • The Reducer’s job is to process the data that comes from the mapper.
  • After processing, it produces a new set of output, which will be stored in the HDFS

Scaling-up is easy in MapReduce

How Map Function Works

 

22nd March 2018

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