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rEDuCE By的意思

reduce to “降低到……,减少到……”,介词to后面接的是最终的结果,也就是最后的位置或程度。 例如: The temperature is 36 degrees,but it will be reduced to 20 degrees in the night. 现在气温40度,但是夜间将会降低到20度。 reduce by “降低...

reduce to减少到…… reduce...to...把……减至…… be reduced by (被动形式)减少了…… 如: reduce to 5 (减少到5) be reduced by 5/ 5% (减少了5/减少了5%)

reduce to (意为减少到...) reduce by (意为减少了...)

reduce to 减少到(即知结果) reduce by 减少幅度(最终结果为原量减去幅度) 如100如果结果是90,那就是reduce to 90或reduce by 10%

reduce by 减至 be(get) used to doing sth 完全一样

spark reduce By Key 通过钥匙的火花减少

reduce on减少到 reduce by减少了

Reduce by 是减少了xxx 比如:The price of apple has reduced by $1. Reduced to 是减少到了 比如:The price of apple has reduced to $1.

题主示例代码中 testData 这个 RDD 的类型是已经确定为 RDD[(String, Int)],然后通过 RDD.rddToRDDPairFunctions 这个隐式类型转换转为 PairRDDFunctions[String, Int],从而获得 reduceByKey 和 combineByKey 这两个 methods。 然后来对比下二...

by表示增加了 in表示增加到 reduce in表示减少到 by表示减少了

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