Thanks very much Konrad! Very interesting videos; I will try experimenting more now.
Do you want to post you answer on SO as well? I originally posted it there... http://stackoverflow.com/questions/30298972/end-to-end-reactive-streaming-restful-service-a-k-a-back-pressure-over-http Thanks! Matteo Il giorno lunedì 18 maggio 2015 11:59:09 UTC+1, Konrad Malawski ha scritto: > > Hi there Matteo, > You’ve arrived in the right place to ask Akka questions :-) > > There are two talks I’m aware of which show a demo how the backpressure > mechanism really works when working with http. > 1) One is Roland Kuhn’s talk on ScalaDays <http://scaladays.org> SF 2015: > https://www.parleys.com/tutorial/akka-http-reactive-web-toolkit > the backpressure over http demo starts around the 44th minute of this talk. > > 2) My talk from ScalarConf <http://scalar-conf.com>Warsaw 2015: > https://www.youtube.com/watch?v=WnTSuYL4_wU the streams part begins > around the 18 minute, > and the backpressuring demo is seen around the 24th minute > <https://youtu.be/WnTSuYL4_wU?t=24m>. It shows a “fast processing” and > “slow processing” server, in which you can see the > curl client being backpressured when the file is being uploaded (I use a > file as an example because it’s a nice “big request”). > > The back pressure is propagated to the client thanks to TCPs built in > mechanisms for this - on the server side we simply do not read from the > socket > until demand is available, which causes the back pressure to be propagated > properly. > > I hope this helps! > > -- > Cheers, > Konrad 'ktoso’ Malawski > Akka <http://akka.io> @ Typesafe <http://typesafe.com> > > On 18 May 2015 at 12:44:49, Matteo De Martino ([email protected] > <javascript:>) wrote: > > I have been trying to clarify this question online for a while without > success, so I will try to ask it here. > > I would like to find some resource or example where it shows how I can > build an end-to-end fully back-pressured REST service + client. What I mean > is that I would like to see that, given a REST client that implements > Reactive Streams (whether in Akka, JS, or whatever), I will have (and be > able to "visualise") the back-pressure handled throughout a REST server > built, e.g. with Akka-Http. > > To be clear, I am searching for something like the following talk (but I > could not find slides or videos to confirm it): > http://oredev.org/2014/sessions/reactive-streaming-restful-applications-with-akka-http > > My doubts with most examples I see are about the fact that I can find > plenty cases where the REST service (server) is using Akka Http and Akka > streams for the back end, but I am not sure that the backpressure is > "communicated" over HTTP and REST, if the client is implementing Reactive > Streams. In such situation, would I have a single "stream" bridged over > TCP/HTTP or just 2 independent streams? That is my main doubt and confusion. > > Hopefully I was clear enough and someone will be able to shed some light > on the matter. > In any case, thank you! > -- > >>>>>>>>>> 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 [email protected] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > Visit this group at http://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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
