[akka-user] 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

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