大数据学习——SparkStreaming整合Kafka完成网站点击流实时统计

Posted 2022-01-07 feifeicui

1.安装并配置zk

2.安装并配置Kafka

3.启动zk

4.启动Kafka

5.创建topic

[[email protected] kafka]# bin/kafka-console-producer.sh --broker-list mini1:9092 --topic cyf-test

 

程序代码

package org.apache.spark

import java.net.InetSocketAddress

import org.apache.spark.HashPartitioner
import org.apache.spark.SparkConf
import org.apache.spark.storage.StorageLevel
import org.apache.spark.streaming.Seconds
import org.apache.spark.streaming.StreamingContext
import org.apache.spark.streaming.flume.FlumeUtils
import org.apache.spark.streaming.kafka.KafkaUtils

object KafkaWordCount 

  val updateFunction = (iter: Iterator[(String, Seq[Int], Option[Int])]) => 
    iter.flatMap  case (x, y, z) => Some(y.sum + z.getOrElse(0)).map(v => (x, v)) 
  

  def main(args: Array[String]) 
    val conf = new SparkConf().setMaster("local[2]").setAppName("KafkaWordCount")
    val ssc = new StreamingContext(conf, Seconds(5))
    //回滚点设置在本地
//    ssc.checkpoint("./")
    //将回滚点写到hdfs
    ssc.checkpoint("hdfs://mini1:9000/kafkatest")

    //val Array(zkQuorum, groupId, topics, numThreads) = args
    val Array(zkQuorum, groupId, topics, numThreads) = Array[String]("mini1:2181,mini2:2181,mini3:2181", "g1", "cyf-test", "2")
    val topicMap = topics.split(",").map((_, numThreads.toInt)).toMap
    val lines = KafkaUtils.createStream(ssc, zkQuorum, groupId, topicMap).map(_._2)
    val results = lines.flatMap(_.split(" ")).map((_, 1)).updateStateByKey(updateFunction, new HashPartitioner(ssc.sparkContext.defaultParallelism), true)


    results.print()
    ssc.start()
    ssc.awaitTermination()
  

 

 记一次遇到的问题 https://www.cnblogs.com/feifeicui/p/11018761.html