场景

现在餐厅老板已经不满足仅仅统计历史用户消费金额总数了，他想知道每个用户半年，每个月，每天，或者一小时消费的总额，来店消费的次数以及平均金额。

给出的例子计算的是每5秒,每30秒,每1分钟的用户消费金额，消费次数，平均消费。

数据格式

{"user":"zhangsan","payment":8}
{"user":"wangwu","payment":7}
....

制作kafka输入数据

与我上篇文章相同
参考这里

处理流程

package StreamingTest

/**
 * Created by liangshiwei on 15/9/9.
 */
import net.liftweb.json._
import org.apache.spark.SparkConf
import org.apache.spark.streaming.dstream.DStream
import org.apache.spark.streaming.kafka.KafkaUtils
import org.apache.spark.streaming.{Seconds, StreamingContext}

object WindowsFunction {

  //利用用户消费金额总和计算结果以及用户消费次数统计计算结果计算平均消费金额
  def avgFunction(sum:DStream[(String,Double)],count:DStream[(String,Int)]): DStream[(String,Double)] = {
    val payment = sum.join(count).map(r => {
      val user = r._1
      val sum = r._2._1
      val count = r._2._2
      (user,sum/count)
    })
    payment
  }

  def main (args: Array[String]) {

    def functionToCreateContext(): StreamingContext = {
      val conf = new SparkConf().setAppName("test").setMaster("local[*]")
      val ssc = new StreamingContext(conf, Seconds(5))

      val zkQuorum = "192.168.6.55:2181,192.168.6.56:2181,192.168.6.57:2181"
      val consumerGroupName = "user_payment"
      val kafkaTopic = "user_payment"
      val kafkaThreadNum = 1

      val topicMap = kafkaTopic.split(",").map((_, kafkaThreadNum.toInt)).toMap

      val user_payment = KafkaUtils.createStream(ssc, zkQuorum, consumerGroupName, topicMap).map(x=>{
        parse(x._2)
      })

      //计算每5s每个用户的消费总和
      val paymentSum = user_payment.map(jsonLine =>{
        implicit val formats = DefaultFormats
        val user = (jsonLine \ "user").extract[String]
        val payment = (jsonLine \ "payment").extract[String]
        (user,payment.toDouble)
      }).reduceByKey(_+_)

      //输出结果
      paymentSum.print()

      //计算每5s每个用户的消费次数
      val paymentCount = user_payment.map(jsonLine =>{
        implicit val formats = DefaultFormats
        val user = (jsonLine \ "user").extract[String]
        (user,1)
      }).reduceByKey(_+_)

//      paymentCount.print()

      //计算每5s每个用户平均的消费金额
      val paymentAvg = avgFunction(paymentSum,paymentCount)
//      paymentAvg.print()

      //窗口操作，在其中计算不同时间段的结果，入库的话根据使用场景选择吧
      def windowsFunction()  {
        //每5秒计算最后30秒每个用户消费金额
        val windowSum_30 = paymentSum.reduceByKeyAndWindow((a: Double, b: Double) => (a + b),_-_, Seconds(30), Seconds(5))
//        windowSum_30.print()

        //每5秒计算最后30秒每个用户消费次数
        val windowCount_30 = paymentCount.reduceByKeyAndWindow((a: Int, b: Int) => (a + b),_-_, Seconds(30), Seconds(5))
//        windowCount_30.print()

        //每5秒计算最后30秒每个用户平均消费
        val windowAvg_30 = avgFunction(windowSum_30,windowCount_30)
//        windowAvg_30.print()

        //每5秒计算最后60秒每个用户消费金额
        val windowSum_60 = windowSum_30.reduceByKeyAndWindow((a:Double,b:Double)=>(a+b),_-_,Seconds(10),Seconds(5))
//       windowSum_60.print()

        //每5秒计算最后60秒每个用户消费次数
        val windowCount_60 = windowCount_30.reduceByKeyAndWindow((a:Int,b:Int) => (a+b),_-_,Seconds(10),Seconds(5))
//        windowCount_60.print()

        //每5秒计算最后60秒每个用户平均消费
        val windowAvg_60 = avgFunction(windowSum_60,windowCount_60)
//        windowAvg_60.print
      }

      windowsFunction()

      ssc
    }

    val context = StreamingContext.getOrCreate("checkPoint", functionToCreateContext _)

    context.start()
    context.awaitTermination()
  }
}

结果节选

实际效果你们自己去体验吧

//-----------消费总额－－－－－－－
(zhangsan,146.0)
(lisi,79.0)
(wangwu,99.0)
(zhaoliu,115.0)

//-----------消费次数－－－－－－－
(zhangsan,32)
(lisi,18)
(wangwu,30)
(zhaoliu,24)

//-----------平均消费－－－－－－－
(zhangsan,4.5625)
(lisi,4.388888888888889)
(wangwu,3.3)
(zhaoliu,4.791666666666667)