[ZT]MapReduce explained in 41 words
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
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