Akka Scala 服务器中的 500 内部服务器错误

Question

这是我使用 Akka 框架编写的服务器代码：

case class Sentence(data: String)
case class RawTriples(triples: List[String])

trait Protocols extends DefaultJsonProtocol {
    implicit val sentenceRequestFormat = jsonFormat1(Sentence)
    implicit val rawTriplesFormat = jsonFormat1(RawTriples)
}

trait Service extends Protocols {
    implicit val system: ActorSystem
    implicit def executor: ExecutionContextExecutor
    implicit val materializer: Materializer

    val openie = new OpenIE
    def config: Config
    val logger: LoggingAdapter

    lazy val ipApiConnectionFlow: Flow[HttpRequest, HttpResponse, Any] =
        Http().outgoingConnection(config.getString("services.ip-api.host"), config.getInt("services.ip-api.port"))

    def ipApiRequest(request: HttpRequest): Future[HttpResponse] = Source.single(request).via(ipApiConnectionFlow).runWith(Sink.head)

    val routes = {
        logRequestResult("akka-http-microservice") {
            pathPrefix("openie") {
                post { 
                    decodeRequest{
                        entity(as[Sentence]){ sentence =>
                            complete {
                                var rawTriples = openie.extract(sentence.data)
                                        val resp: MutableList[String] = MutableList()

                                for(rtrip <- rawTriples){
                                    resp += (rtrip.toString())
                                }
                                val response: List[String] = resp.toList

                                println(response)
                                response
                            }
                        }
                    }
                }
            }
        }
    }
}

object AkkaHttpMicroservice extends App with Service {
    override implicit val system = ActorSystem()
    override implicit val executor = system.dispatcher
    override implicit val materializer = ActorMaterializer()

    override val config = ConfigFactory.load()
    override val logger = Logging(system, getClass)

    Http().bindAndHandle(routes, config.getString("http.interface"), config.getInt("http.port"))
}

服务器接受一个包含句子的POST请求，并返回一个json数组作为回报。它工作正常，但如果我使用并行代码过于频繁地向它发出请求，那么它会给出 500 内部服务器错误。我想知道是否可以在服务器中设置任何参数来避免这种情况（接受请求的就绪线程数等）。

在日志文件中，错误记录为：

[错误] [05/31/2017 11:48:38.110] [default-akka.actor.default-dispatcher-6] [akka.actor.ActorSystemImpl(default)] 处理过程中的错误 请求：“空”。完成 500 内部服务器错误响应。

Answer 1

bindAndHandle 方法的文档显示了您想要的内容：

/**
 * Convenience method which starts a new HTTP server at the given endpoint and uses the given `handler`
 * [[akka.stream.scaladsl.Flow]] for processing all incoming connections.
 *
 * The number of concurrently accepted connections can be configured by overriding
 * the `akka.http.server.max-connections` setting. Please see the documentation in the reference.conf for more
 * information about what kind of guarantees to expect.
 *
 * To configure additional settings for a server started using this method,
 * use the `akka.http.server` config section or pass in a [[akka.http.scaladsl.settings.ServerSettings]] explicitly.
 */

akka.http.server.max-connections 可能是你想要的。正如文档建议的那样，您还可以深入了解akka.http.server 配置部分。

Answer 2

在 application.conf 文件中添加以下内容

akka.http {
  server {
    server-header = akka-http/${akka.http.version}
    idle-timeout = infinite
    request-timeout = infinite
  }
}