Thank you for your answer, Konrad.
I am guessing this shouldn't be the issue, because I have consumed the same
stream very slowly using curl --limit-rate 75k. And it took me over 5
minutes to go from end to end. And it worked ell.
But I am not sure if akka http handles the socket the same way as curl
does. So you might be right. I will try to emulate that setting parallelism
to 1 and tuning the sleep interval.
On Friday, September 30, 2016 at 12:00:53 PM UTC-3, Konrad Malawski wrote:
>
> That means the other side has closed the connection. It could be an idle
> timeout. Are you sure data is consistently flowing, and not being idle for
> minutes?
>
> On 30 Sep 2016 16:59, "Eric Torti" <eric...@gmail.com <javascript:>>
> wrote:
>
>> Hey guys,
>>
>> I am new to akka streams so I may be missing something big here. Using
>> akka-stream, akka-http-core, akka-typed-experimental all 2.4.10 - scala
>> 2.11.8.
>>
>> I am experiencing the `connection reset by peer` error on a stream that I
>> have checked with `curl` to remain open far longer than the time it takes
>> akka to crash.
>>
>> The stream is produced from json lines like so:
>>
>> ```
>>
>> def stream(): Source[Development, Any] = {
>>
>> def chunkConsumer(res: HttpResponse) = {
>> res.entity.dataBytes
>> .via(Framing.delimiter(ByteString("\r\n"), 1048576, allowTruncation =
>> true))
>> .map[Development](bs => { parse(bs.utf8String).extract[Development] })
>> }
>>
>> val req = HttpRequest(method = HttpMethods.GET, uri =
>> s"http://$endpoint:$port/developments/stream";)
>> val res: Source[Development, Any] =
>> Source.single(req).via(client).flatMapConcat(chunkConsumer)
>>
>> res
>> }
>>
>> ```
>>
>> And consumed like so:
>>
>> ```
>>
>> def slowAsyncTransformation(d: Development) = {
>> Future { Thread sleep 50; d }
>> }
>>
>> val parallelism = 2
>>
>> DevelopmentsAPI
>> .stream()
>> .mapAsync(parallelism)(slowAsyncTransformation(_))
>> .runFold(0)((acc, d) => {
>> System.out.println("processing development " + d.id)
>> acc + 1
>> })
>> .onComplete {
>> case Success(s) => {
>> System.out.println(s"processed $s developments")
>> system.terminate()
>> Await.result(system.whenTerminated, 5 seconds)
>> System.exit(0)
>> }
>> case Failure(ex) => {
>> System.err.println(s"Could not finish processing developments: $ex")
>> system.terminate()
>> Await.result(system.whenTerminated, 5 seconds)
>> System.exit(1)
>> }
>> }
>>
>> ```
>>
>>
>> I can consistently get this to work from end to end in 180 seconds if I have
>> `parallelism` set to 2.
>>
>>
>> But if I set `parallelism` to 1, it crashes in 35 seconds with `Could not
>> finish processing developments: akka.stream.StreamTcpException: The
>> connection closed with error: Connection reset by peer`
>>
>> I cannot make sense of why is the degree of parallelism being 1 would
>> cause the peer to reset the connection.
>>
>> Any help will be greatly appreciated.
>>
>> Thanks,
>>
>> Eric
>>
>> --
>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>> >>>>>>>>>> Check the FAQ:
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>
--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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