Spark Scala生成随机RDD（1和0）？

使用此代码，您可以创建一个0到1之间随机数的RDD数组：

import scala.util.Random

val arraySize = 15 // Total number of elements that you want
val numberOfOnes = 10 // From that total, how many do you want to be ones
val listOfOnes = List.fill(numberOfOnes)(1) // List of 1s
val listOfZeros = List.fill(arraySize - numberOfOnes)(0) // Rest list of 0s
val listOfOnesAndZeros = listOfOnes ::: listOfZeros // Merge lists
val randomList = Random.shuffle(listOfOnesAndZeros) // Random shuffle
val randomRDD = sc.parallelize(randomList) // RDD creation
randomRDD.collect() // Array[Int] = Array(1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1)
或者，如果您只想使用RDD：

val arraySize = 15
val numberOfOnes = 10

val rddOfOnes = spark.range(numberOfOnes).map(_ => 1).rdd
val rddOfZeros = spark.range(arraySize - numberOfOnes).map(_ => 0).rdd
val rddOfOnesAndZeros = rddOfOnes ++ rddOfZeros
val shuffleResult = rddOfOnesAndZeros.mapPartitions(iter => {
val rng = new scala.util.Random()
iter.map((rng.nextInt, _))
}).partitionBy(new org.apache.spark.HashPartitioner(rddOfOnesAndZeros.partitions.size)).values

shuffleResult.collect() // Array[Int] = Array(0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1)