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Avoid memory being retained for groupBy #24758

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This commit avoids memory being retained for groupBy. Prior to the commit, closedSubstreams could grow unbounded. This commit includes the size of closedSubstreams when considering to take on a new substream, while retaining the semantics described by its Flow API.
This commit is contained in:
Christopher Hunt 2018-11-09 18:28:44 +01:00 • committed by Johan Andrén
parent e847ce016a
commit 86884133ed
2 changed files with 2 additions and 2 deletions
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2
akka-stream-tests/src/test/scala/akka/stream/scaladsl/FlowGroupBySpec.scala
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@ -149,7 +149,7 @@ class FlowGroupBySpec extends StreamSpec {
}
"accept cancellation of substreams" in assertAllStagesStopped {
new SubstreamsSupport(groupCount = 2) {
new SubstreamsSupport(groupCount = 2, maxSubstreams = 3) {
StreamPuppet(getSubFlow(1).runWith(Sink.asPublisher(false))).cancel()
val substream = StreamPuppet(getSubFlow(0).runWith(Sink.asPublisher(false)))

2
akka-stream/src/main/scala/akka/stream/impl/fusing/StreamOfStreams.scala
View file

@ -334,7 +334,7 @@ import akka.stream.impl.fusing.GraphStages.SingleSource
nextElementValue = elem
}
} else {
if (activeSubstreamsMap.size == maxSubstreams)
if (activeSubstreamsMap.size + closedSubstreams.size == maxSubstreams)
throw tooManySubstreamsOpenException
else if (closedSubstreams.contains(key) && !hasBeenPulled(in))
pull(in)