Mapreduce shuffle and sort

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For each mapreduce, is shuffle and sort operation performed before or its happened after the completion of all mappers?

Dec 27, 2018 in Big Data Hadoop by slayer
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1 answer to this question.

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The mapreduce task happens in the following order

  1. Mapping
  2. Shuffle
  3. Sort
  4. Reduce

Shuffle can happen while mappers are generating data since it is only a data transfer. But the sort and reduce can only start once all the mappers are done.

answered Dec 27, 2018 by Omkar
• 67,660 points

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