spark:reducebykey与groupbykey的区别

从源码看：

reduceBykey与groupbykey：

都调用函数combineByKeyWithClassTag[V]((v: V) => v, func, func, partitioner)
reduceBykey的map端进行聚合combine操作
mapSideCombine = true

groupbykey的mapSideCombine = false

标签：reduceBykey,groupbykey,调用函数,mapSideCombine,reducebykey,源码,func,spark
来源： https://www.cnblogs.com/hejunhong/p/12906105.html