spark streaming整合kafka

版本说明：spark：2.2.0；　　kafka：0.10.0.0

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

    Logger.getLogger("org.apache.spark").setLevel(Level.WARN)
    Logger.getLogger("org.eclipse.jetty.server").setLevel(Level.WARN)
    Logger.getLogger("org.apache.kafka.clients.consumer").setLevel(Level.WARN)

    val warehouseLocation = new File("hdfs://user/hive/warehouse").getAbsolutePath

    val bootstrapServers = "192.168.156.111:9092,192.168.156.111:9092,192.168.156.111:9092"

    val spark: SparkSession = SparkSession
      .builder()
      .appName("Spark SQL To Hive")
      .config("spark.sql.warehouse.dir", warehouseLocation)
      .master("local[4]")
      .enableHiveSupport()
      .getOrCreate()

    spark.conf.set("spark.streaming.concurrentJobs", 10)
    spark.conf.set("spark.streaming.kafka.maxRetries", 50)
    spark.conf.set("spark.streaming.stopGracefullyOnShutdown", true)
    spark.conf.set("spark.streaming.backpressure.enabled", true)
    spark.conf.set("spark.streaming.backpressure.initialRate", 5000)
    spark.conf.set("spark.streaming.kafka.maxRatePerPartition", 3000)

    @transient
    val sc: SparkContext = spark.sparkContext
    val ssc: StreamingContext = new StreamingContext(sc, Seconds(5))

    //kafka params
    val kafkaParams = Map[String, Object](
      "auto.offset.reset" -> "latest",
      "value.deserializer" -> classOf[StringDeserializer],
      "key.deserializer" -> classOf[StringDeserializer],
      "bootstrap.servers" -> bootstrapServers,
      "group.id" -> "test-consumer-group",
      "enable.auto.commit" -> (true: java.lang.Boolean)
    )

    var stream: InputDStream[ConsumerRecord[String, String]] = null
    val topics = Array("test")

    stream = KafkaUtils.createDirectStream[String, String](
      ssc,
      LocationStrategies.PreferConsistent,
      ConsumerStrategies.Subscribe[String, String](topics, kafkaParams)
    )

    stream.foreachRDD(rdd => {
      val cache_rdd: RDD[String] = rdd.map(x => x.value()).cache()

      cache_rdd.foreach(println)

    })

    ssc.start()

    ssc.awaitTermination()

  }
}