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下面这段,不多评论了,简明扼要地道出了mapreduce的基本原理。 Goal: count the number of books in the library. Map: You count up shelf #1, I count up shelf #2. (The more people we get, the faster this part goes. ) Reduce: We all get together and add up our individual counts. 本文转自:https://www.chrisstucchio.com/blog/2011/mapreduce_explained.html |
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