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courses:mapreduce-tutorial:step-8 [2012/01/29 20:58]
straka 		courses:mapreduce-tutorial:step-8 [2012/01/29 21:04]
straka
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 ====== MapReduce Tutorial : Multiple mappers, reducers and partitioning ====== ====== MapReduce Tutorial : Multiple mappers, reducers and partitioning ======
  
-In order to achieve parallelism, mappers and reducers must be executed in parallel.+A Hadoop job, which is expected to run on many computers at the same time, need to use multiple mappers and reducers. It is possible to control these numbers to some degree.
  
 ===== Multiple mappers ===== ===== Multiple mappers =====

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