非同期処理を使った応答性能改善 AWS Lambda

by Hyuga-Tsukui

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ඇಉظॲཧΛ࢖ͬͨԠ౴ੑೳ վળ ServerlessLTॳ৺ऀ޲͚ LTେձ #24

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ࣗݾ঺հ • Hyuga Tsukuiʢ@hy_twenʣ • γΣϧϑΟʔʢגʣͰݐઃۀք޲͚SaaSΛ։ൃ͍ͯ͠·͢ • ࣾ֎LTॳ௅ઓͰ͢👋

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ࠓ೔఻͍͑ͨ͜ͱ • ೔ৗ͔Βݟ͑Δඇಉظॲཧͱ͸ʁ • ඇಉظॲཧͷ࢖͍ॴ • ߴίετͳॲཧͷऔΓѻ͍ͱγϯϓϧͳղܾࡦͷ঺հ

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ඇಉظॲཧͱ͸ • ޙͰ݁ՌΛฦ͢͜ͱΛ໿ଋ͠ɺҰ౓ॲཧΛ׬ྃͤ͞Δɻ݁Ռ͕༻ҙͰ ͖ͨΒݺͼग़͠ݩʹ͋ΒͨΊͯ݁ՌΛ௨஌͢Δ࢓૊Έͷ͜ͱʢࢀߟ https://www.htmlhi fi ve.com ඇಉظॲཧͱPromiseΛഎܠ͔Βཧղ͠Α͏ʣ

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͋Δ೔ͷ͓ങ͍෺Λߟ͑ͯΈ·͢ • εʔύʔซઃͷༀہͰɺॲํᝦ͔ΒༀΛ࡞ͬͯ΋Β͏ʢλεΫAʣ • ͖ΐ͏ͷ൩͝͸Μͷ৯ࡐΛങ͏ʢλεΫBʣ

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ಉظॲཧVer. ॲํᝦड෇ ௐࡎʢNJOʣ ଴ػʢNJOʣ ௐࡎ׬ྃ ങ͍෺ NJO

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ඇಉظॲཧVer. ॲํᝦड෇ ௐࡎʢNJOʣ ങ͍෺ NJO ௐࡎ׬ྃ ड෇൪߸ൃߦ

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྆ऀͷҧ͍ • ಉظVer.͸ௐࡎ͕ऴΘͬͨΒങ͍෺Λ։࢝͢Δ • ඇಉظVer.͸ௐࡎதʹങ͍෺Λ։࢝͢Δ

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ಉظॲཧVer. ॲํᝦड෇ ௐࡎʢNJOʣ ଴ػʢNJOʣ ௐࡎ׬ྃ ങ͍෺ NJO Ұ࿈ͷॲཧ͕׬ྃ͢Δ·ͰNJO͔͔Δ

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ඇಉظॲཧVer. ॲํᝦड෇ ௐࡎʢNJOʣ ങ͍෺ NJO ௐࡎ׬ྃ ड෇൪߸ൃߦ Ұ࿈ͷॲཧ͕׬ྃ͢Δ·ͰNJO͔͔Δ

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ௐࡎΛຊ౰ʹ଴ͭඞཁ͕͋Δ͔ʁ

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ड෇൪߸(PromiseʣͳͲͰඇಉظతʹ ॲཧͰ͖Δ

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ඇಉظॲཧΛݕ౼͢ΔMotivation • λεΫͷ׬ྃΛ଴ͭඞཁ͕ແ͍ͱ͖ • Ұ࿈ͷλεΫͷྲྀΕʢ͋Δ೔ͷ͓ങ͍෺ʣͷதͰɺϘτϧωοΫͱͳ ΔΑ͏ͳλεΫ͕͋Δ࣌

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γεςϜͷ࿩

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ϦΞϧͳͷߟ͑·ͨ͠ʂ

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͋ΔIOTػثͷར༻։࢝αʔϏεΛߟ͑Δ • ػث͸ࡏݿ؅ཧDBͰͲͷސ٬͕ར༻͢Δ͔؅ཧ͍ͯ͠Δ • ػث͕ωοτϫʔΫΛར༻͢Δʹ͸ɺػثఏڙϕϯμͷAPI΁ϓϩϏ δϣχϯάਃ੥Λ͢Δඞཁ͕͋Δ • ϓϩϏδϣχϯάਃ੥׬ྃʹ͸਺෼Λཁ͢Δ • ࣦഊ͢ΔՄೳੑ΋͋Δ

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ུਤ

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λεΫΛ෼͚ͯΈΔͱ • ػثࡏݿʹؔ͢ΔॲཧͱɺϓϩϏδϣχϯάΛ͢Δॲཧ͸෼͚Εͦ͏ • ϓϩϏδϣχϯάॲཧ͸͕͔͔࣌ؒΔͷͰɺλεΫΛ෼͚ͳ͍ͱɺԠ ౴ੑ͕͜͜ʹӨڹΛड͚ͯѱ͘ͳΔ • ࣦഊͨ͠ͱ͖ʹϓϩϏδϣχϯά͔Β͚ͩ΍Γ௚ͤͦ͏

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ඇಉظॲཧΛݕ౼͢ΔMotivation • λεΫͷ׬ྃΛ଴ͭඞཁ͕ແ͍ͱ͖ • Ұ࿈ͷλεΫͷྲྀΕʢ͋Δ೔ͷ͓ങ͍෺ʣͷதͰɺϘτϧωοΫͱͳ ΔΑ͏ͳλεΫ͕͋Δ࣌

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ࠓճखܰʹඇಉظԽ͢Δͷ͸͜͜ʂ

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͍͟ɺServerless΁ʂ

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࠷ऴߏ੒ਤ

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࠷ऴߏ੒ਤ ͜͜

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AWS SimpleQueueService(SQS) • AWS͕ఏڙ͢ΔServerlessͳϝοηʔδΩϡʔΠϯάαʔϏεͰ༷ʑ ͳServerlessͰߏ੒͞ΕͨΞϓϦΛ౷߹Ͱ͖Δ • Lambdaͱͷ࿈ܞ͕༰қ • ϦτϥΠ΍ɺࣦഊͨ͠ϝοηʔδͷอଘ͕Մೳ • ඇৗʹߴ଎ʢඪ४ΩϡʔͳΒࣄ্࣮ແ੍ݶ

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AWS SimpleQueueService(SQS) ͜Μͳײ͡ʹɺൺֱతॊೈͳϝοηʔδΛऔΓѻ͑·͢ɻ(256kb·ͰͷςΩετ) ྫͱͯ͠ɺࠓճͷϓϩϏδϣχϯάAPIʹඞཁͦ͏ͳ஋Λઃఆͯ͠Έ·͠ΐ͏ɻ { “eventId”: “7885ca34-f3ff-4575-b062-da50e9ae746a”, “macAddress”: “00-00-5E-10-00-00-00-00“ // document༻ʹ͋Δར༻Մೳͳ஋Ͱ͢ }

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AWS SimpleQueueService(SQS) ·ͨࠓճཁ݅ͱͯ͠ɺ֎෦APIͷࣦഊՄೳੑ͕͋ΔͷͰɺDeadLetterQueueͷઃఆ΋ΦεεϝͰ͢ɻ Πϝʔδͱͯ͠͸ɺࣦഊͨ͠ϝοηʔδΛࣗಈͰҰ࣌తʹผͷQueue΁֨ೲ͠ɺܾΊΒΕͨϧʔϧͰ࠶PushʢReDriveʣ͠·͢ɻ ·ͨࢦఆͷճ਺࣮ߦͯ͠΋ফԽͰ͖ͳ͔ͬͨ৔߹͸ɺDeadLetterQueue΁อଘ͞Εɺࢦఆظؒܦաޙ࡟আ͞Ε·͢ɻ

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࠷ऴߏ੒ਤ ͜͜

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AWS Lambda • AWS͕ఏڙ͢ΔServerlessͷίϯϐϡʔςΟϯάϦιʔε • ๛෋ͳରԠݴޠɺϥϯλΠϜΛ࣋ͭͷͰϏδωεϩδοΫͷ࣮૷ίε τ͕௿ • ࣮ߦ࣌ؒͰͷ՝ۚͷͨΊɺॲཧʹΑͬͯ͸௿ίετ • ߴεέʔϥϏϦςΟ • ࠓճͰ͍͏ͱSQSͱͷ૬ੑ͕ൈ܈ͰɺࣗલͰϙʔϦϯάج൫Λ࣋ͭ

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AWS Lambda Lambda͸ଟ͘ͷىಈτϦΨʔΠϕϯτΛ͍࣋ͬͯΔͷͰɺSQSʹϝοηʔδ͕PUT͞ΕͨͷΛܖػʹɺىಈ͢ΔͳͲ͕ઃఆҰͭͰߦ͑ ·͢ɻ

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ࠓճߏ੒ͷ஫ҙ఺ ɾSQSʹඪ४ΩϡʔΛࢦఆͨ͠৔߹ɺat least once ͷ࢓༷ʹΑΓɺಉ͡ϝοηʔδ͕ෳ਺PULL͞ΕΔՄೳੑ͕͋Γ·͢ɻ { “eventId”: “7885ca34-f3ff-4575-b062-da50e9ae746a”, “macAddress”: “00-00-5E-10-00-00-00-00“ // document༻ʹ͋Δར༻Մೳͳ஋Ͱ͢ } 👆͜ͷϝοηʔδ͕ೋճPULL͞ΕΔͷͰɺಉ͡macAddressΛॲཧ͢ΔLambda͕ෳ਺ճ࣮ߦ͞ΕΔՄೳੑ͕͋Δɻ

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ࠓճߏ੒ͷ஫ҙ఺ ɾͦͷͨΊɺႈ౳ੑ֬อ·ͨ͸ɺϩοΫػߏΛඞ࣮ͣ૷͢Δඞཁ͕͋Γ·͢ɻ EX. DynamoDBΛར༻ָͨ͠؍Lockʢٙࣅίʔυʣ status = dynamoDB.GetItem(eventId=1) if (status === 0) { api.call(macAddress); }else { return }

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͋Δ͔΋͠Εͳ͍ٙ໰఺

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͋Δ͔΋͠Εͳ͍ٙ໰఺ Q1. Lambda΋ࣗಈϦτϥΠ͋Δ͡ΌΜɺͳΜͰSQS? A1. ͦͷͱ͓ΓͰ͕͢ɺ࠷ऴతʹ࣮ߦͰ͖ͳ͔ͬͨevent͕SQSͷ΄͏͕௥͍΍͍ͨ͢ΊͰ͢ɻLambdaͰ΋ࣦഊͨ͠eventΛ DeadLetterQueueʹஷΊ͓ͯ͘ߏ੒͸͋ΔΑ͏Ͱ͢ɻ Q2. ͳΜͰDynamoDBʁRDSͰ͸ବ໨ͳͷ͔ A1. LambdaͱRDSͷ૬ੑ͸ྑ͘ͳ͍ͱ͢Δͷ͕ҰൠతͰ͢ɻཧ༝͸ɺRDS͸ࣄ্࣮εέʔϧΞοϓͰͷରԠ͔͠Ͱ͖ͳ͍ͨΊݶք͕ۙ ͍Ͱ͕͢ɺLambda͸ແ੍ݶͷεέʔϧΞ΢τͳͷͰɺ͜͜ͰRDS͕ϘτϧωοΫʹͳΔͨΊͰ͢ɻ ίωΫγϣϯϓʔϧͷ໰୊౳͸Amazon RDS ProxyͳͲΛར༻͢Δ͜ͱͰଧ։Ͱ͖Δ͔΋͠Ε·ͤΜʢ΍ͬͨ͜ͱͳ͍Ͱ͢ɻ

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ