sample

 

 

import org.apache.spark.rdd.RDD
import org.apache.spark.{SparkConf, SparkContext}


//map(func)
object sampleRDD {
  def main(args: Array[String]): Unit = {
    //本地模式
    val conf: SparkConf = new SparkConf().setAppName("My scala word count").setMaster("local")

    //创建spark上下文对象
    val sc = new SparkContext(conf)
    val rdd: RDD[Int] = sc.makeRDD(1 to 10)
    val value: Any = rdd.sample(true,0.1,0)
    println(value)


    val ints: Array[Int] = rdd.takeSample(true,3,1)
    println(ints.mkString(","))


  }


}