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spark reducebykey

spark reducebykey

reducebykey和reduce功能差不多，reducebykey针对rdd里具有相同key的不同value作（汇总、聚合）操作。 add实际是对lines这个rdd进行处理，处理方式时reducebyKey,即把lines里具有相同key的value进行累和操作，但求和不是一起加完而是两两球和最后得到总和。

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