题目内容

Mapreduce中Partitioner是用来控制输出到多个Reducer，因此可以通过修改Partitioner来指定key值传递到Reducer的方法

A. 对
B. 错

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Mapreduce中的Combiner阶段可以理解为本地reduce，通过combiner可以减少从map传递到reduce的数据量，提高Mapreduce的程序效率

A. 对
B. 错

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