Question

我正在尝试向akka-http发送200k消息。

protected val someRouts: Route = pathPrefix("foo") {
        pathEndOrSingleSlash {
          put {
             entity(as[Foo]) { foo =>
              log.debug(s"/foo update $foo")
              complete(Future(Foo("a")).map(f => s"Got - $f "))
            }
          }
        }

Http().bindAndHandle(someRouts, "0.0.0.0", 9000)

来自不同的进程我发送循环200K消息。客户代码（简化）：

lazy val apiFlow: Flow[HttpRequest, HttpResponse, Any] =
    Http().outgoingConnection("0.0.0.0", 9000)

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

for (i <- 1 to 200000){
    request(RequestBuilding.Put("/foo", Foo(i))
}

过了一会儿，我得到了这个例外：

[akka.actor.default-dispatcher-33] ERROR akka.io.TcpListener - Accept error: could not accept new connection
java.io.IOException: Too many open files in system
    at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
    at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
    at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
    at akka.io.TcpListener.acceptAllPending(TcpListener.scala:112)
    at akka.io.TcpListener$$anonfun$bound$1.applyOrElse(TcpListener.scala:85)
    at akka.actor.Actor$class.aroundReceive(Actor.scala:502)
    at akka.io.TcpListener.aroundReceive(TcpListener.scala:34)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
    at akka.actor.ActorCell.invoke(ActorCell.scala:495)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
    at akka.dispatch.Mailbox.run(Mailbox.scala:224)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

UPDATE 使用lsof -i tcp:9000 | wc -l检查打开的连接我可以看到该数字显着超过6500

Answer 1

您的问题是您尝试打开到0.0.0.0:9000的200,000个TCP连接，并且您正在使用的计算机未配置为允许一次激活那么多文件描述符。

来自the docs（强调我的）：

请注意，在返回的流实际实现之前，不会尝试连接！ 如果流程已实现多次，则将打开几个独立的连接（每个实现一个）。

检查ulimit -n - 它可能远低于200K。

另见：

Akka http在高吞吐量上抛出异常 - java.io.IOException：系统

1 个答案: