val first: Int = rdd.first() println(first) //1 //take : 获取数据源的前N个数 val ints1: Array[Int] = rdd.take(2) println(ints1.mkString(",")) //1,2 //takeOrdered : 排序后取前n个元素 val rdd1 = sc.makeRDD(List(4, 2, 3, 1)) val ints2: Array[Int] = rdd1.takeOrd...