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Can hadoop mapreduce accomplish the following functions? How to achieve it?
Take A as the key of map output, and value as a class similar to vectorwritable, and save a C.

When decreasing, there are sum 1, sum2...sumn, which are the sum of the same indexes of vectorwritable, and finally divided by values.size.

The output value of reduce is also v? e？ c？ Where to? r？ W? ri？ ta？ b？ Pragmatic trade (labor exchange) low explosive (labor exchange)

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