www.rqgq.net > rEDuCE to和rEDuCE By 是什么意思?

rEDuCE to和rEDuCE By 是什么意思?

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 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 to (意为减少到...) reduce by (意为减少了...)

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.

decline to当降至讲的时候与reduce to类似; 但decline to有倾斜的意思,to指方向,如:The hill declines to the river. 山脚向着河畔倾斜。 decline to还有另一个意思,指拒绝:She declined to say more about the plan. 她拒绝对此计划再说...

reduce on减少到 reduce by减少了

reduce to使处于;使变弱为;迫使;归纳为 be reduced to减小为,分解为;简化为,还原为

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

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...

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