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Reduce端的shuffle过程

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MapReduce体系结构主要由四个部分组成，分别是：（）、JobTracker、（）以及Task

HDFS 以固定大小的（）为基本单位存储数据，而对于MapReduce 而言，其处理单位是（）。

MapReduce将复杂的、运行于大规模集群上的并行计算过程高度地抽象到了两个函数：（）和（）。

The paragraph below has been taken from the text but includes ten blanks. You are required to select one word for each blank from a list of words in the word bank provided. You may not use any of the words in the word bank more than once.The fact that blind children are “seeing” with their ears and tongues and (1) of their toes suggests that there are no special sensory cells (2) , but the ability to see is (3) throughout the body and is (4) to all cells. It is clear that different types and strengths of light (5) the cells in different ways and that one can learn to (6) this difference and recognize the differing types of light.This explains why the Russians have found this ability is best in bright light and becomes less (7) , just as (8) sight does, as darkness falls. But it does not explain why some people can see through (9) of metal or why the ability (10) if the object (or the hand of the person) is electrically earthed.