This appears to me to be a problem with rates and cycles within the HttpClient.transportToConnectionClientFlow.
Augmenting the flow with a buffer as described in http://doc.akka.io/docs/akka-stream-and-http-experimental/1.0-M3/scala/stream-graphs.html seems to get us much farther. Here's the updated flow logic: requestIn ~> methodBypassFanout ~> terminationMerge.requestInput ~> requestRendering ~> transportFlow ~> responseParsingMerge.dataInput ~> responsePrep ~> terminationFanout ~> responseOut methodBypassFanout ~> Flow[HttpRequest].buffer(10, OverflowStrategy.dropHead ) ~> methodBypass ~> responseParsingMerge.methodBypassInput terminationFanout ~> terminationMerge.terminationBackchannelInput Since for our example case, we're doing nothing but GET calls, dropping a RequestMethod guaranteed to be a GET would appear to be risk free and proves there's a rate based deadlock. Although this isn't a proper fix, it prevents the deadlock and allows us to continue processing farther than before. However, we eventually reach a point where the server ends up crashing with: java.lang.StackOverflowError at akka.parboiled2.Parser.__run(Parser.scala:197) at akka.http.model.parser.UriParser.parseHttpRequestTarget(UriParser.scala:203) at akka.http.model.Uri$.parseHttpRequestTarget(Uri.scala:252) at akka.http.engine.parsing.HttpRequestParser.parseRequestTarget(HttpRequestParser.scala:107) at akka.http.engine.parsing.HttpRequestParser.parseMessage(HttpRequestParser.scala:42) at akka.http.engine.parsing.HttpMessageParser.startNewMessage(HttpMessageParser.scala:86) at akka.http.engine.parsing.HttpRequestParser.parseEntity(HttpRequestParser.scala:157) at akka.http.engine.parsing.HttpMessageParser.parseHeaderLines(HttpMessageParser.scala:126) at akka.http.engine.parsing.HttpRequestParser.parseMessage(HttpRequestParser.scala:45) at akka.http.engine.parsing.HttpMessageParser.startNewMessage(HttpMessageParser.scala:86) at akka.http.engine.parsing.HttpRequestParser.parseEntity(HttpRequestParser.scala:157) at akka.http.engine.parsing.HttpMessageParser.parseHeaderLines(HttpMessageParser.scala:126) at akka.http.engine.parsing.HttpRequestParser.parseMessage(HttpRequestParser.scala:45) ... Hopefully this info makes a core dev's day a little easier. -- >>>>>>>>>> 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.
