HDPCD-Java-复习笔记(2)

2.编写MapReduce应用程序(Writing MapReduce Applications) 一个MapReduce程序由两个主要阶段组成(A MapReduce program consists of two main phases): Map phase -- 数据输入到Mapper, 由Mapper转换并将转换后的数据提供给Reducer. (Data is input into th
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