Streaming-Kafka-redis

package utils

import org.apache.commons.pool2.impl.GenericObjectPoolConfig
import redis.clients.jedis.{Jedis, JedisPool}

/**
  * 創建jedis連接池
  */
object Jpools {
   private val poolConfig = new GenericObjectPoolConfig()
  poolConfig.setMaxIdle(5)//最大的空閒連接數
  poolConfig.setMaxTotal(2000)//支持最大的連接數
  //連接池不需要對外提供訪問
  private lazy val jedisPool = new JedisPool(poolConfig,"hadoop01")

  /**
    * 對外提供一個可以從池子裏面獲取連接的方法
    * @return
    */
  def getJedis :Jedis={
    val jedis = jedisPool.getResource
    jedis.select(2)
    jedis
  }
}

package kafka2

import java.lang

import org.apache.kafka.common.serialization.StringDeserializer
import org.apache.spark.SparkConf
import org.apache.spark.streaming.kafka010.{ConsumerStrategies, KafkaUtils, LocationStrategies}
import org.apache.spark.streaming.{Seconds, StreamingContext}
import utils.Jpools

object DataConsumerToRedis {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf().setAppName("redis").setMaster("local[*]")
    conf.set("spark.streaming.kafka.maxRatePerPartition","2")
    conf.set("spark.streaming.stopGracefullyOnShutdown","true")

    val ssc = new StreamingContext(conf,Seconds(2))

    //定義一個消費組
    val groupid = "day_002"
    //配置參數
    val kafkaParams = Map[String, Object](
      "bootstrap.servers" -> "hadoop01:9092,hadoop02:9092,hadoop03:9092",
      "key.deserializer" -> classOf[StringDeserializer],
      "value.deserializer" -> classOf[StringDeserializer],
      "group.id" -> groupid,
      "auto.offset.reset" -> "earliest",
      //"auto.commit.interval.ms"-> "1000",設置爲1秒提交一次offset,默認是5秒
      "enable.auto.commit" -> (false: lang.Boolean) //是否自動遞交偏移量
    )

    //創建kafka
    val stream = KafkaUtils.createDirectStream(
      ssc,
      LocationStrategies.PreferConsistent,
      ConsumerStrategies.Subscribe[String, String](Array("wordcount"), kafkaParams)
    )
    //將DStream -->RDD
    stream.foreachRDD(rdd=>{
      rdd.map(crd=>(crd.value(),1)).reduceByKey(_+_).foreachPartition(item=>{
        //獲取一個jedis連接
        val jedis = Jpools.getJedis
        item.foreach(tp=>{
          jedis.hincrBy("Word",tp._1,tp._2)
        })
        jedis.close()
      })
    })
    ssc.start()
    ssc.awaitTermination()
  }
}