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
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