Hadoop Shuffle學習

Shuffle In many ways,the shuffle is the heart of MapReduce and is where the ‘magic’ happens Shuffle橫跨Map、Reduce兩個階段 Map階段 進入Memory Buffer。每個Map都對應一個Memory Buffer ，每個map處理以後的結果都會進入環形緩存區。 Partition。對每一個

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