Hi, I faced another use case where buffering can lead to unwanted behavior. I have implemented a FallbackRoute (using FlexiRoute) that has one input and two output, a "default" one and a "fallback" one. When the flow connected to the default one complete (or fails) any remaining input in the upstream flow is redirected to the fallback outlet. Due to buffering some elements get lost because are already forwarded to the default outlet.
I solved this implementing an ActorSubscriber with ZeroRequestStrategy that will request one element only when the current one has been processed, but this works only when connecting the sink directly to the FallbackRoute, if I put a Flow.map in between then buffering kicks in and the problem arise again. It would be nice to control better how buffering works in between sync stages. Anyway thank you for akka-streams, they are really cool! Francesco. Il giorno lunedì 30 marzo 2015 10:52:39 UTC+2, √ ha scritto: > > > > On Mon, Mar 30, 2015 at 10:36 AM, Peter Schmitz <[email protected] > <javascript:>> wrote: > >> >> I know that, but a section of my Flowgraph (SubFlowGraph) should act like >> a single stream stage, >> > > "should act like a single stream stage"—from what/whose perspective? > > >> that means having only one (possibly large) buffer for that section. The >> whole section will be used async. Currently each stage in my SubFlowGraph >> buffers at least one element. Sadly it's not possible to make that section >> a function f to use Flow[T].map(f). >> Any ideas? >> > > May I ask what the problem with the current behavior is for you? > > >> >> >> Am Montag, 30. März 2015 10:08:10 UTC+2 schrieb √: >>> >>> Hi Peter, >>> >>> Akka streams is about async stream processing and without a buffer you >>> cannot be async. >>> >>> -- >>> Cheers, >>> √ >>> On 30 Mar 2015 09:22, "Peter Schmitz" <[email protected]> wrote: >>> >>>> Actually ActorFlowMaterializerSettings is complaining >>>> about initialInputBufferSize = 0. What are the reasons you can't disable >>>> buffering elements by setting initialInputBufferSize and >>>> maxInputBufferSize >>>> to zero? I am aware that one of the core features of akka-stream is >>>> buffering to gain throughput. But in my use case I like to disable >>>> buffering at least for a certain stream-section. Are there other ways to >>>> accomplish this? >>>> >>>> Thanks in advance! Great job, guys! >>>> >>>> Peter >>>> >>>> -- >>>> >>>>>>>>>> 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. >>>> >>> -- >> >>>>>>>>>> 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. >> > > > > -- > 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 [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.
