Hi,
I'm seeing an issue where the graph completes while there is still data in
one of the flows. The last element emitted by the source enters a custom
GraphStageLogic flow, where it is sent to a function that returns a Future.
That Future has a callback which invokes getAsyncCallback and then
push(out). For the last element, the Future callback fires (pushCallback
.invoke(xml)) but the AsyncCallback is never invoked and the graph stops.
For more context, this is what I have going on inside the GraphStageLogic:
val s3ListBucket: Source[ByteString, NotUsed] =
s3Client.listBucket(bucket, Some(currentPrefix), maxKeys, nextMarker)
val bucketListingXml: Future[String] = s3ListBucket
.map(_.utf8String)
.runWith(Sink.seq)(materializer)
.map(_.mkString)(materializer.executionContext)
bucketListingXml.foreach {
xml =>
println(s"This gets called. prefix $currentPrefix")
pushCallback.invoke(xml)
}(materializer.executionContext)
And the callback
val pushCallback = getAsyncCallback[String] { xml =>
log.info(s"This is never called for last element in graph!")
push(out, xml)
}
I don't see any errors and this issue consistently occurs on the last
element. Thanks
Andrew
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