Hadoop Shuffle学习

Shuffle In many ways,the shuffle is the heart of MapReduce and is where the ‘magic’ happens Shuffle横跨Map、Reduce两个阶段 Map阶段 进入Memory Buffer。每个Map都对应一个Memory Buffer ，每个map处理以后的结果都会进入环形缓存区。 Partition。对每一个

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