FlatMap

package sparkcore

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

object Demo04FlatMap {
  def main(args: Array[String]): Unit = {

    val conf: SparkConf = new SparkConf().setAppName("FlatMap").setMaster("local")

    val sc = new SparkContext(conf)

    val lineRDD: RDD[String] = sc.parallelize(List("java,spark,hadoop","spark,java,hadoop"))

    /**
      * flatMap:将一行转换成多行
      */
    val wordsRDD: RDD[String] =lineRDD.flatMap(line=>{
      println("flatMap:"+line)
      line.split(",")
    })
    wordsRDD.foreach(println)
  }

}