Spark Scala当中reduceByKey(_+_) reduceByKey((x,y) => x+y)的用法

[学习笔记]

reduceByKey(_+_)是reduceByKey((x,y) => x+y)的一个简洁的形式
*/

    val rdd08 = sc.parallelize(List((1, 1), (1, 4),(1, 3), (3, 7), (3, 5)))
    val rdd08_1 = rdd08.reduceByKey((x, y) => x + y)
    println("reduceByKey 用法 " + rdd08_1.collect().mkString(","))

    sc.stop()
}

def myunion(rdd05: RDD[Int], rdd06: RDD[Int]): Unit = {
    val res: RDD[Int] = rdd05.union(rdd06)