MapReduce is a programming model and an associated implementation for processing and generating large data sets. Users specify a map function that processes a key/value pair to generate a set of intermediate key/value pairs, and a reduce function that merges all intermediate values associated with the same intermediate key. --Google
idea_boy
今日笔记
reduce() 函数接收两个参数,一个是函数,一个是 Iterable,reduce 把结果继续和序列的下一个元素做累积计算。
map 映射 reduce 化简
我是如何向老婆解释MapReduce的?