SparkStreaming之WordCount

代码：

import org.apache.log4j.{Level, Logger}
import org.apache.spark.SparkConf
import org.apache.spark.streaming.{Seconds, StreamingContext}

object StreamingWordCount {
  def main(args: Array[String]): Unit = {
    Logger.getLogger("org").setLevel(Level.ERROR)
    val conf = new SparkConf().setMaster("local[2]").setAppName("streamingwordcount")
    val sc = new StreamingContext(conf, Seconds(5))
    val lines = sc.socketTextStream("localhost", 9999)
    val result = lines.flatMap(_.split(" "))
      .map((_, 1))
      .reduceByKey(_ + _)
    result.print()

    sc.start()
    sc.awaitTermination()
  }
}

结果：