Akka Actor应用程序在高音量下挂起

Question

我正在使用 akka actor 开发负载生成器应用程序。该应用程序适用于数百万个请求，但是当将负载增加到超过 1000 万个请求或使用无限循环运行负载一段时间（而不是请求数）时，应用程序会挂起。下面是一个简化的实现，它只是打印正在测试的命令。我还注意到统计信息未记录，或者应用程序在时间结束时不会关闭。我使用调度程序每 30 秒转储一次统计信息，并在 2 小时后关闭应用程序。以较小的间隔进行测试，看不到"统计信息"和"关闭"消息的处理。

知道什么可能导致应用程序挂起吗？

import akka.actor._
import akka.util.duration._
import akka.routing.RoundRobinRouter
import com.test.redload.util.CommandGenerator
import org.apache.log4j.Logger
import akka.util.Duration
class LoadWorker extends Actor {
  val log = Logger.getLogger(this.getClass().getName())
  def receive = {
    case "PUT" => sender ! PUT
    case "GET" => sender ! GET
    case "DELETE" => sender ! DELETE
    case "POST" => sender ! POST
    case "HEAD" => sender ! HEAD
  } 
  def PUT():Boolean = {println("PUT");return true}
  def GET():Boolean = {println("GET");return true}
  def DELETE():Boolean = {println("DELETE");return true}
  def POST():Boolean = {println("POST");return true}
  def HEAD():Boolean = {println("HEAD");return true}
}
class LoadGenerator(nrOfWorkers:Int, noOfMessages:Int) extends Actor {
  val log = Logger.getLogger(this.getClass().getName())
  val start:Long = System.currentTimeMillis
  var noOfMessageRcvd:Int = 0
  val r = new CommandGenerator// <- is basically are list implementation that iterates and returns the next command
  r.addCommand("PUT",5) r.addCommand("GET",2) r.addCommand("DELETE",2)
  r.addCommand("POST",2) r.addCommand("HEAD",1) r.addCommand("LBRPOP",1)
  val loadRouter = context.actorOf(Props[LoadWorker].withRouter(RoundRobinRouter(nrOfWorkers)),name ="loadRouter")
  def receive = {
    case "start" => {
      if(noOfMessages > 1) {
        for( i <- 0 until noOfMessages) loadRouter ! r.getRandomCommand()
      } else {
        log.info("Time bound Load run..")
        //for( i <- 0 until 10000000) { //<- For any number greater than few millions that app hangs after few messages
        while(true){loadRouter ! r.getRandomCommand() //<- with while loop the app hangs as soon as it begins
        }
      }
    }
    case true => {
          noOfMessageRcvd +=1
          if(noOfMessages == noOfMessageRcvd){
             self ! "shutdown"
          }
    }
    case "stats" => {
          logStats()
    }
    case "shutdown" => {
          logStats()
          log.info("Shutting Down!")
          context.system.shutdown()
    }
  }
  def logStats(){
    var duration = (System.currentTimeMillis - start)/1000
    if( duration > 0) {
        log.info(noOfMessageRcvd+" messages processed in "+duration +" seconds "
         + "at "+ noOfMessageRcvd/duration +" TPS" )
    } else {
        log.info(noOfMessageRcvd+" messages processed in less than a second ")
    }
  }
}
object RedLoad extends App{
    val log = Logger.getLogger(this.getClass().getName())
    val system = ActorSystem("LoadGeneratorApp");
    // -1 is if we want to run for a period of time and > 1 the run will end after the messages are procesed
    val lg = system.actorOf(Props(new LoadGenerator(100,-1)),"LG")
    //Log the stats every 30 seconds
    system.scheduler.schedule(0 seconds,30 seconds,lg,"stats")
    //Shutdown the load run after 2 hours, if no of message is  > -1 then it will shutdown after
    //all messages are processed
    system.scheduler.scheduleOnce(2 hours,lg,"shutdown")
    lg ! "start"
    log.info("Started..")
}

Answer 1

好吧，你的Actor不能一次处理多条消息，你只是把它设置为永远忙于发送消息。按设计工作。删除无限循环并将成批的消息发送到 loadRouter 并发送自己继续消息以继续发送更多消息。

case SendBatch =>
  (1 to batchSize) foreach { router ! message }
  self ! SendBatch