HttpServerBluePrint: Cannot push port (requestPrepOut) twice

[Kyrylo Stokoz]

Hi All,

During run of my application which is using akka-streams & akka-http of v.2.4.6 sometimes i see following error in the logs:

Error in stage [akka.http.impl.engine.server.HttpServerBluePrint$ControllerStage@42104288]: requirement failed: Cannot push port (requestPrepOut) twice java.lang.IllegalArgumentException: requirement failed: Cannot push port (requestPrepOut) twice at scala.Predef$.require(Predef.scala:224) at akka.stream.stage.GraphStageLogic.push(GraphStage.scala:435) at akka.http.impl.engine.server.HttpServerBluePrint$ControllerStage$$anon$12$$anon$13.onPush(HttpServerBluePrint.scala:393) at akka.stream.impl.fusing.GraphInterpreter.processElement$1(GraphInterpreter.scala:587) at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:598) at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:539) at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:472) at akka.stream.impl.fusing.GraphInterpreterShell.receive(ActorGraphInterpreter.scala:424) at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:604) at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:619) at akka.actor.Actor$class.aroundReceive(Actor.scala:482) at akka.stream.impl.fusing.ActorGraphInterpreter.aroundReceive(ActorGraphInterpreter.scala:530) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526) at akka.actor.ActorCell.invoke(ActorCell.scala:495) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)

What can cause such behavior? Is this a bug?

Regards,

Kyrylo

[Endre Varga]

Yes, this looks like a bug. Can you please file a ticket?

--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
---
You received this message because you are subscribed to the Google Groups "Akka User List" group.
To unsubscribe from this group and stop receiving emails from it, send an email to akka-user+...@googlegroups.com.
To post to this group, send email to akka...@googlegroups.com.
Visit this group at https://groups.google.com/group/akka-user.
For more options, visit https://groups.google.com/d/optout.

[Kyrylo Stokoz]

Done. https://github.com/akka/akka/issues/20642