Question

我为应用程序将要执行的阻止操作配置了一个调度程序，如下所示：

engine {
  blocking-io-dispatcher {
     type = Dispatcher
     executor = "thread-pool-executor"
     thread-pool-executor {
       fixed-pool-size = 3
     }
       throughput = 1
  }
}

但是，我在日志中看到每5秒就有3个以上的线程正在处理请求（线程6,16,5,7,15）

控制台输出：

system-engine.blocking-io-dispatcher-6
system-engine.blocking-io-dispatcher-16
system-engine.blocking-io-dispatcher-5
system-engine.blocking-io-dispatcher-7
system-engine.blocking-io-dispatcher-15

请在下面找到代码：

import akka.actor.Actor
import akka.actor.ActorSystem
import akka.actor.Props
import java.util.Date
import akka.routing.RoundRobinRouter
import akka.routing.DefaultResizer

class SendPushNotificationActor extends Actor {
   def receive = {
      case SendPushNotificationMessage(message) => {
      println(Thread.currentThread().getName)
      // Simulate blocking operation which takes 5 seconds to send the push notification message
      Thread.sleep(5000)
    }
  }
}

object SendPushNotificationTest {

  def main(args: Array[String]): Unit = {
    val system = ActorSystem("system")

    val sendPushNotificationActor = system.actorOf(Props[SendPushNotificationActor].withDispatcher("engine.blocking-io-dispatcher")
  .withRouter(RoundRobinRouter(nrOfInstances = 5)))

    for (i <- 1.to(100)) {
      sendPushNotificationActor ! SendPushNotificationMessage("Push Notification Message")
    }
  }
}

case class SendPushNotificationMessage(message: String)

任何了解如何使池固定的帮助将不胜感激。

Answer 1

池中的线程可能由于某种原因而死亡，在这种情况下，可以立即生成新线程来替换死掉的线程，并使池保持固定大小。新线程被赋予了递增的ID，这就是您在日志文件中看到的。线程池的大小肯定是固定的。

Akka-用于阻塞操作的固定线程池-阻塞调度程序

1 个答案: