mapreduce - Availability of inputs to reducers -

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in map-reduce stages, enforces barrier between map , reduce. reducers cannot continue until mappers completed assigned jobs. possible reducer start new job earlier higher efficiency? if answer yes or no why?

no reduce phase can’t complete until mappers have completed assigned workload. because can’t predicted ahead of time because prediction of completing jobs , reduce job totally unpredictable till time mappers finished.


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