[akka-user] Re: akka 2.4.10 - connection reset by peer when consuming stream with parallelism == 1
Yes, Konrad. You nailed it.
I can get it to work with parallelism set to 1 and sleep interval tuned
down from 50 to 25.
This is something I cannot work around from the client side, right? This
idle timeout is something set on the server side.
I am worried that back pressure is causing my http connection to become
idle.
On Friday, September 30, 2016 at 12:00:09 PM UTC-3, Eric Torti 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:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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Re: [akka-user] akka 2.4.10 - connection reset by peer when consuming stream with parallelism == 1
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" >
> 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:
>> 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
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>> 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
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[akka-user] akka 2.4.10 - connection reset by peer when consuming stream with parallelism == 1
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:
>> http://doc.akka.io/docs/akka/current/additional/faq.html
>> Search the archives: https://groups.google.com/group/akka-user
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