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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.
https://www.chrisstucchio.com/blog/2011/mapreduce_explained.html来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/6906/viewspace-1437746/，如需转载，请注明出处，否则将追究法律责任。
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