spark streaming的有状态例子

import org.apache.spark._import org.apache.spark.streaming._/**  * Created by code-pc on 16/3/14.  */object Pi {  def updateStateFunction(newValues: Seq[Int], runningCount: Option[Int]): Option[Int] = {    Some(runningCount.getOrElse(0) + newValues.sum)  }  def main(args: Array[String]) {    val conf = new SparkConf().setMaster("local[5]").setAppName("AndrzejApp")    val ssc = new StreamingContext(conf, Seconds(4))    ssc.checkpoint("/tmp")    val line = ssc.socketTextStream("127.0.0.1", 9997)    val words=line.flatMap(_.split(" "))    val pairs=words.map((_,1))    pairs.print()    val retDS = pairs.updateStateByKey(updateStateFunction _)    retDS.print()    ssc.start()    ssc.awaitTermination()  }}

tcp：
nc -lk 9997