My crystal ball tells me you may be observing timing artifacts which originate from the fact that you println one thing, but log the other. So there will be a timing difference when one or the other actually hits System.out.
Agree with Viktor though, reproducers please for such cases :) -- Konrad `ktoso` Malawski Akka <http://akka.io> @ Lightbend <http://lightbend.com> On 16 December 2016 at 16:03:44, Viktor Klang (viktor.kl...@gmail.com) wrote: Plase submit a miminized reproducer so readers have a chance of running the code. On Fri, Dec 16, 2016 at 3:44 PM, <subo...@gmail.com> wrote: > Hi, > > I'm seeing an issue where the graph completes while there is still data in > one of the flows. The last element emitted by the source enters a custom > GraphStageLogic flow, where it is sent to a function that returns a Future. > That Future has a callback which invokes getAsyncCallback and then > push(out). For the last element, the Future callback fires (pushCallback > .invoke(xml)) but the AsyncCallback is never invoked and the graph stops. > > For more context, this is what I have going on inside the GraphStageLogic: > > val s3ListBucket: Source[ByteString, NotUsed] = > s3Client.listBucket(bucket, Some(currentPrefix), maxKeys, nextMarker) > > val bucketListingXml: Future[String] = s3ListBucket > .map(_.utf8String) > .runWith(Sink.seq)(materializer) > .map(_.mkString)(materializer.executionContext) > > > bucketListingXml.foreach { > xml => > > println(s"This gets called. prefix $currentPrefix") > > pushCallback.invoke(xml) > }(materializer.executionContext) > > > And the callback > > > val pushCallback = getAsyncCallback[String] { xml => > log.info(s"This is never called for last element in graph!") > push(out, xml) > } > > > I don't see any errors and this issue consistently occurs on the last > element. Thanks > > Andrew > > -- > >>>>>>>>>> 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+unsubscr...@googlegroups.com. > To post to this group, send email to akka-user@googlegroups.com. > Visit this group at https://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- Cheers, √ -- >>>>>>>>>> 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+unsubscr...@googlegroups.com. To post to this group, send email to akka-user@googlegroups.com. Visit this group at https://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout. -- >>>>>>>>>> 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+unsubscr...@googlegroups.com. To post to this group, send email to akka-user@googlegroups.com. Visit this group at https://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
