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courses:mapreduce-tutorial:step-7 [2012/01/29 20:51]
straka 		courses:mapreduce-tutorial:step-7 [2012/01/29 20:52]
straka
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   less less step-7-out-sol/part-*   less less step-7-out-sol/part-*
 Remarks: Remarks:
-  * The reducers seem to start running before the mappers finishes. In the web interface, the running time of reducers is divided into thirds: during the first 33%, the mapper outputs are copied +  * The reducers seem to start running before the mappers finish. In the web interface, the running time of reducers is divided into thirds: 
 +    * during the first 33%, the mapper outputs are copied to the machine where reducer runs. 
 +    * during the second 33%, the (key, value) pairs are sorted. 
 +    * during the last 33%, the user-defined reducer runs.
  
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