The mapAsync and the mapAsyncUnordered an unexpected behavior

[Boris Lopukhov]

I have a simple actor publisher:

class TestActor extends ActorPublisher[Int] {

  println("RUN")

  def receive = {
    case Request(elements) => while (totalDemand > 0 && isActive) {
      onNext(1)
    }
    case Cancel => println("CANCEL")
  }
}

and i found a strange feature:

  Source[Int](Props[TestActor])
    .map { x => throw new Exception(); x }
    .runForeach { x => }

printed RUN and CANCEL

  Source[Int](Props[TestActor])
    .mapAsync(Future.successful)
    .map { x => throw new Exception(); x }
    .runForeach { x => }

printed only RUN

  Source[Int](Props[TestActor])
    .mapAsyncUnordered(Future.successful)
    .map { x => throw new Exception(); x }
    .runForeach { x => }

 
throwed java.lang.OutOfMemoryError

i use "1.0-M3" version of akka-streams

[Endre Varga]

Hi Boris,

On Fri, Feb 27, 2015 at 10:41 AM, Boris Lopukhov <89b...@gmail.com> wrote:

I have a simple actor publisher:

class TestActor extends ActorPublisher[Int] {

  println("RUN")

  def receive = {
    case Request(elements) => while (totalDemand > 0 && isActive) {
      onNext(1)
    }
    case Cancel => println("CANCEL")
  }
}

and i found a strange feature:

  Source[Int](Props[TestActor])
    .map { x => throw new Exception(); x }
    .runForeach { x => }

printed RUN and CANCEL

This is itself fine, you get the error in the Future returned by runForeach.

 

  Source[Int](Props[TestActor])
    .mapAsync(Future.successful)
    .map { x => throw new Exception(); x }
    .runForeach { x => }

printed only RUN

This is not fine though.

 

  Source[Int](Props[TestActor])
    .mapAsyncUnordered(Future.successful)
    .map { x => throw new Exception(); x }
    .runForeach { x => }

 
throwed java.lang.OutOfMemoryError

This is also not fine. I suspect there is a problem handling already completed Futures. You should file a ticket, this seems like a bug. If you could also try using a not already completed Future that would help.

-Endre

 

i use "1.0-M3" version of akka-streams

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[Boris Lopukhov]

Thanks for response!

I created issue https://github.com/akka/akka/issues/16959

пятница, 27 февраля 2015 г., 13:54:35 UTC+4 пользователь drewhk написал: