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Question:When do reducers play their role in a mapreduce task?



asked Sep 13, 2013 in Cloud-Computing by rajesh
edited Sep 12, 2013
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The reducers in a mapreduce job do not begin before all the map jobs are completed. Once all the map jobs are completed the reducers begin copying the intermediate key-value pairs from the mappers. Overall reducers start working as soon as the mappers are ready with key-value pairs.
answered Sep 13, 2013 by rajesh
edited Sep 12, 2013
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The reducers in a mapreduce job do not begin before all the map jobs are completed. Once all the map jobs are completed the reducers begin copying the intermediate key-value pairs from the mappers. Overall reducers start working as soon as the mappers are ready with key-value pairs.
answered Sep 13, 2013 by rajesh
edited Sep 12, 2013

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