Question

我正在以编程方式创建远程akka actor。

以下是计划 -

RemoteProgrammatically {
  akka {
    actor {
      provider = "akka.remote.RemoteActorRefProvider"
      deployment {
        /remoteActorAddr {
          remote = "akka.tcp://RemoteNodeApp@localhost:2553"
        }
      }
    }
    remote {
      enabled-transports = ["akka.remote.netty.tcp"]
      netty.tcp {
        hostname = "localhost"
        port = 2553
      }
    }
  }
}

配置为 -

[INFO] [12/27/2017 10:37:30.053] [main] [akka.remote.Remoting] Starting remoting
[INFO] [12/27/2017 10:37:30.378] [main] [akka.remote.Remoting] Remoting started; listening on addresses :[akka.tcp://RemoteNodeApp@localhost:2553]
[INFO] [12/27/2017 10:37:30.379] [main] [akka.remote.Remoting] Remoting now listens on addresses: [akka.tcp://RemoteNodeApp@localhost:2553]
[INFO] [12/27/2017 10:37:30.418] [RemoteNodeApp-akka.actor.default-dispatcher-14] [akka://RemoteNodeApp/deadLetters] Message [java.lang.String] from Actor[akka://RemoteNodeApp/user/remoteActorAddr#-766312407] to Actor[akka://RemoteNodeApp/deadLetters] was not delivered. [1] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
[INFO] [12/27/2017 10:37:34.419] [RemoteNodeApp-akka.actor.default-dispatcher-14] [akka://RemoteNodeApp/deadLetters] Message [java.lang.String] from Actor[akka://RemoteNodeApp/user/remoteActorAddr#-766312407] to Actor[akka://RemoteNodeApp/deadLetters] was not delivered. [2] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.

运行程序后的输出是 -

remoteActorAddr

我发给演员的信息总是进入死信。看起来在RemoteNodeApp actor系统上未成功创建sf2。任何想法为什么没有创建演员以及为什么消息总是进入死信。感谢。

Answer 1

Message [java.lang.String] from Actor[akka://RemoteNodeApp/user/remoteActorAddr#-766312407] to Actor[akka://RemoteNodeApp/deadLetters] was not delivered. [1] dead letters encountered.

上面的日志摘录说，当从远程actor发送字符串消息时会遇到死信邮箱。远程演员显然正在向sender()发送消息，在这种情况下这是死信，因为远程演员收到的消息是从演员外部用tell（!）发送的。换句话说，远程actor 是成功创建的，但是以下两个消息是从非actor发送的，这会导致远程actor中的sender()解析为死信：

remoteActor ! "Hello!" ... actorSelection ! "Hello!"

来自documentation（强调我的）：

actorRef ! message

如果从Actor内调用，则发送actor引用将与消息一起隐式传递，并在其sender(): ActorRef成员方法中可用于接收Actor。目标参与者可以使用此sender() ! replyMsg来回复原始发件人。

如果从不是Actor的实例调用，默认情况下发件人将是deadLetters actor引用。

从另一个actor发送消息，或使用ask模式（创建一个内部actor来处理回复）。

以编程方式创建远程Actor无法正常工作

1 个答案: