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Akka StreamsͷॖୀॲཧΛ༻͍ͨ
োੑͷ࣮ݱ
ʙ ࠂͷϦΞϧλΠϜΦʔΫγϣϯͷࣄྫ ʙ
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ࣗݾհ
@ikuo (Ikuo Matsumura)
2008~ ࠐܥͷࢄγϛϡϨʔγϣϯͷઃܭ։ൃͳͲ; C++, MATLAB
IBM Research - Tokyo
2011~ ϨγϐӫཆՁͷࣗಈܭࢉͷઃܭ։ൃͳͲ; Ruby/Rails, Treetop
Cookpad, Inc.
2014~ SSP/RTBΦʔΫγϣϯͷઃܭ։ൃͳͲ; Scala/Akka
CyberAgent, Inc.
CA ProFit-X team
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ࠂͷϦΞϧλΠϜΦʔΫγϣϯ (RTB)
ߴ͍Մ༻ੑཁ݅ɿࢭΊΒΕͳ͍ ˍ ͬͯ͘Εͳ͍
ෆ࣮֬ͳڥɿ֎෦ͷଟͷೖࡳݩ(DSP)ʹৗ࣌ଓ
ೖࡳ͕શͯἧΘͳ͍͜ͱڐ༰Ͱ͖Δ
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ଟͷ֎෦ଓͷো͔ΒγεςϜΛकΓ͍ͨ
* Photo by FEMA/Joselyne Augus5no; A home in Gilchrist, Texas, designed to resist flood
waters survived Hurricane Ike in 2008.
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֎෦ଓͷোͱΞϓϩʔν
ʮͪ͜Βʯͷҟৗɿଓͷ෦ঢ়ଶͷҟৗ
ྫɿHTTP ΫϥΠΞϯτͷActorͷঢ়ଶҟৗ
→ SupervisorʹΑΔҟৗݕͱActorͷ࠶ىಈ
ʮ͋ͪΒʯͷҟৗɿϨΠςϯγѱԽɾແԠԽ
ྫɿଓઌͷܭࢉࢿݯଳҬͷṧഭ
→ ॖୀ (fallback)ɿॏཁͰͳ͍ϝοηʔδΛࣺͯͯ
ɹɹϝϞϦރׇ (OutOfMemoryError) Λ͙
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ରࡦ1: BoundedMailboxΛ͏
bounded-mailbox {
mailbox-type = "akka.dispatch.NonBlockingBoundedMailbox"
}
✅ ᷓΕͨΒϝοηʔδࣺͯΔͷͰϝϞϦރׇ͛Δ
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❌ Ձͷߴ͍ϝοηʔδ͕ࣺͯΒΕΔ
ؒʹ߹͏ݟࠐΈͷখ͍͞ೖࡳཁٻ͕ͬͯ͠·͏
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ରࡦ2: ༏ઌ͖ͭͷBoundedMailboxΛ͏
bounded-mailbox {
mailbox-type = "akka.dispatch.BoundedStablePriorityMailbox"
mailbox-push-timeout-time = 0s
}
✅ ᷓΕͨΒϝοηʔδࣺͯΔͷͰϝϞϦރׇ͛Δ
✅ Ձͷߴ͍ϝοηʔδΛͤΔ
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❌ ద༻࿙ΕͷActor͕͋ΔͱϝϞϦރׇ͛ͳ͍
UnboundedͳϝʔϧϘοΫεͷActor͕͋Γɺ͕ͦ͜
ʹͳΔͱϝʔϧϘοΫε͕ᷓΕΔ
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ରࡦ3: Akka StreamsΛ͏
ϝοηʔδִนϊʔυ (bulkhead) Λհͯ͠௨৴ϊʔυ (subscriber) ʹBroadcastɻ
௨৴ϊʔυ֎෦ཁٻྃ·ͰϝοηʔδΛ্ྲྀʹཁٻ͠ͳ͍ɻ
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ִนϊʔυ (bulkhead)
val bulkhead =
Flow
.apply[MyMessage]
.buffer(
bulkheadBufferSize,
OverflowStrategy.dropHead
)
όοϑΝͷ࠷େαΠζΛ͑Δͱɺݹ͍ϝοηʔδ
ΛࣺͯΔ ( dropHead )
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௨৴ϊʔυ (subscriber)
val subscriberA = Sink(ActorSubscriber[MyMessage](actorA))
class ProxyA extends Actor with ActorSubscriber {
def receive = {
case OnNext(msg: MyMessage) =>
hostConnector
.ask(httpReq(msg))
.map(...)
.onComplete(request(1))
...
֎෦ཁٻͷྃΛ͔ͬͯΒ࣍ͷϝοηʔδΛ্ྲྀ
(bulkhead) ʹཁٻ͢ΔͷͰɺ֎෦ཁٻͷաఔͷͲ͕͜
ʹͳͬͯϝʔϧϘοΫε͕ᷓΕͳ͍
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Akka StreamsΛ͏
✅ ᷓΕͨΒϝοηʔδࣺͯΔͷͰϝϞϦރׇ͛Δ
✅ Ձͷߴ͍ϝοηʔδΛͤΔ
✅ ཁҼ͕Ҡಈ࣮ͯ֬͠ʹॖୀͰ͖Δ
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CA ProFit-X
• 20153݄ʹϦϦʔε
• ॳ͔ΒAkka StreamsʹΑΔ
ॖୀॲཧΛࠐΈ
• ݱࡏඵؒ1ສ݅ͷϦΞϧλ
ΠϜΦʔΫγϣϯΛ҆ఆͯ͠
ॲཧ
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·ͱΊ
Akka StreamsΛ֎෦ଓͷॖୀͷͨΊʹ͏͜ͱ
Ͱɺʮͬͯ͘Εͳ͍ʯڥͰ֎෦ଓͷোʢੑ
ೳྼԽ ) ͔ΒγεςϜΛकΔྫΛհ͠·ͨ͠ɻ
ॲཧͱผͷ োੑ ͷଆ໘ͰAkka StreamsΛ
׆༻͢Δྫͷ1ͭͱͯ͠ɺࢀߟʹͳΕ͍Ͱ͢ɻ