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                [hadoop-notebook](http://www.hmoore.net/kancloud/hadoop-notebook/45557) - HDFS - MapReduce - Yarn ## HDFS ### hdfs架構圖 [Hadoop核心之HDFS 架構設計](http://blog.csdn.net/suifeng3051/article/details/48548341) - 數據塊 - NameNode - DataNode - SecondaryNameNode 各自的作用 ## MapReduce Mapreduce是一個計算框架。 MapReduce講的就是分而治之的程序處理理念。 MapReduce的根本原則是信息處理的本地化,哪臺PC持有相應要處理的數據,哪臺PC就負責處理該部分的數據,這樣做的意義在于可以減少網絡通訊負擔。 [學習的demo](https://github.com/chubbyjiang/MapReduce)
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