spark--actions算子--takeSample

import org.apache.spark.{SparkConf, SparkContext}/**  * Created by yz02 on 2017/6/16.  */object A_takeSample {  System.setProperty("hadoop.home.dir","F:\\hadoop-2.6.5")  def main(args: Array[String]): Unit = {    val conf = new SparkConf().setAppName("takeSample_test").setMaster("local")    val sc = new SparkContext(conf)    //准备一下数据    val nameList : List[Int] = List(1,2,3,4,5)    val numbers = sc.parallelize(nameList)    //随机两个数据    val num = numbers.takeSample(true,2,1)    for (x <- num)      {        println(x)      }    //随机4个数据，注意随机的数据可能是重复的    val num1 = numbers.takeSample(true,4,1)    for (x <- num1)    {      println(x)    }    val num2 = numbers.takeSample(false,4,1)    for (x <- num2)    {      println(x)    }  }}

运行结果：

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