主要內容

Spark Streaming與Kafka版的WordCount示例（一）

Spark Streaming與Kafka版的WordCount示例（二）

1. Spark Streaming與Kafka版本的WordCount示例 （一）

啟動kafka集群

root@sparkslave02:/hadoopLearning/kafka_2.10-0.8.2.1# bin/kafka-server-start.sh config/server.properties root@sparkslave01:/hadoopLearning/kafka_2.10-0.8.2.1# bin/kafka-server-start.sh config/server.properties root@sparkmaster:/hadoopLearning/kafka_2.10-0.8.2.1# bin/kafka-server-start.sh config/server.properties

向kafka集群發(fā)送消息

root@sparkslave01:/hadoopLearning/kafka_2.10-0.8.2.1# bin/kafka-console-producer.sh --broker-list sparkslave01:9092 --sync --topic kafkatopictest

編寫如下程序

import org.apache.kafka.clients.producer.{ProducerConfig, KafkaProducer, ProducerRecord} import org.apache.log4j.{Level, Logger}import org.apache.spark.streaming._ import org.apache.spark.streaming.kafka._ import org.apache.spark.{Logging, SparkConf}object KafkaWordCount {def main(args: Array[String]) {if (args.length < 4) {System.err.println("Usage: KafkaWordCount <zkQuorum> <group> <topics> <numThreads>")System.exit(1)}StreamingExamples.setStreamingLogLevels()val Array(zkQuorum, group, topics, numThreads) = argsval sparkConf = new SparkConf().setAppName("KafkaWordCount").setMaster("local[4]")val ssc = new StreamingContext(sparkConf, Seconds(2))ssc.checkpoint("checkpoint")val topicMap = topics.split(",").map((_, numThreads.toInt)).toMap//創(chuàng)建ReceiverInputDStreamval lines = KafkaUtils.createStream(ssc, zkQuorum, group, topicMap).map(_._2)val words = lines.flatMap(_.split(" "))val wordCounts = words.map(x => (x, 1L)).reduceByKeyAndWindow(_ + _, _ - _, Minutes(10), Seconds(2), 2)wordCounts.print()ssc.start()ssc.awaitTermination()} }

配置運行參數(shù)：

具體如下：

sparkmaster:2181 test-consumer-group kafkatopictest 1

sparkmaster:2181，zookeeper監(jiān)聽地址
test-consumer-group， consumer-group的名稱，必須和$KAFKA_HOME/config/consumer.properties中的group.id的配置內容一致
kafkatopictest，topic名稱
1，線程數(shù)

運行KafkaWordCount 后，在producer中輸入下列內容

root@sparkslave01:/hadoopLearning/kafka_2.10-0.8.2.1# bin/kafka-console-producer.sh --broker-list sparkslave01:9092 --sync --topic kafkatopictest [2015-11-04 03:25:39,666] WARN Property topic is not valid (kafka.utils.VerifiableProperties) Spark Spark TEST TEST Spark Streaming

得到結果如下：

2. Spark Streaming與Kafka版本的WordCount示例（二）

前面的例子中，producer是通過kafka的腳本生成的，本例中將給出通過編寫程序生成的producer

// 隨機生成1-100間的數(shù)字 object KafkaWordCountProducer {def main(args: Array[String]) {if (args.length < 4) {System.err.println("Usage: KafkaWordCountProducer <metadataBrokerList> <topic> " +"<messagesPerSec> <wordsPerMessage>")System.exit(1)}val Array(brokers, topic, messagesPerSec, wordsPerMessage) = args// Zookeeper連接屬性配置val props = new HashMap[String, Object]()props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, brokers)props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringSerializer")props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringSerializer")//創(chuàng)建KafkaProducerval producer = new KafkaProducer[String, String](props)// 向kafka集群發(fā)送消息while(true) {(1 to messagesPerSec.toInt).foreach { messageNum =>val str = (1 to wordsPerMessage.toInt).map(x => scala.util.Random.nextInt(10).toString).mkString(" ")val message = new ProducerRecord[String, String](topic, null, str)producer.send(message)}Thread.sleep(1000)}}}

KafkaWordCountProducer 運行參數(shù)設置如下：

sparkmaster:9092 kafkatopictest 5 8

sparkmaster:9092，broker-list
kafkatopictest，top名稱
5表示每秒發(fā)多少條消息
8表示每條消息中有幾個單詞

先KafkaWordCountProducer，然后再運行KafkaWordCount ，得到的計算結果如下：

總結

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