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Event Sourcing+CQRS を活用するスケーラブルアプリケーション開発 / eve...
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yuuki takezawa
November 02, 2018
Technology
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Event Sourcing+CQRS を活用するスケーラブルアプリケーション開発 / event-sourcing-cqrs-v2
AWS Dev Day 2018
マイクロサービスアーキテクチャの裏側の巻
yuuki takezawa
November 02, 2018
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Transcript
Event Sourcing+CQRSΛ׆༻͢Δ εέʔϥϒϧΞϓϦέʔγϣϯ։ൃ yuuki takezawa AWS Dev Day Tokyo 2018
Profile • ᖒ ༗و / ytake • גࣜձࣾΞΠελΠϧ CTO •
PHP, Hack, Go, Scala • Apache Hadoop, Apache Spark, Apache Kafka • twitter https://twitter.com/ex_takezawa • facebook https://www.facebook.com/yuuki.takezawa • github https://github.com/ytake
ΞϓϦέʔγϣϯͷ
ΞϓϦέʔγϣϯྫ • ϩάΠϯϢʔβʔίϝϯτ͕ߘͰ͖Δ • ະϩάΠϯϢʔβʔӾཡͷΈ͕Ͱ͖Δ • ͓ؾʹೖΓͨ͠ϢʔβʔͷίϝϯτΛӾཡͰ͖Δ • ࣌ܥྻͰίϝϯτΛӾཡͰ͖Δ •
ίϝϯτͷআ͕Ͱ͖Δ • ίϝϯτͷฤूͰ͖ͳ͍ ͳͲ
ΞϓϦέʔγϣϯ࣮ • ೝূػೳͷ࣮ • ίϝϯτߘɺฤूɺӾཡػೳ࣮ • ݕࡧػೳͷ࣮
γϯϓϧͳΞϓϦέʔγϣϯߏ
ෳࡶԽ͢ΔΞϓϦέʔγϣϯ • ػೳՃ • ίϝϯτใΛଞͷػೳͰར༻͍ͨ͠ • ݅ʹΑΔҰཡใͷιʔτมߋ ϢʔβʔใଐੑʹΑΔιʔτॱมߋ
ෳࡶԽ͢ΔΞϓϦέʔγϣϯ
ංେԽ͢ΔΞϓϦέʔγϣϯ • ऩӹԽͷͨΊͷػೳ • རศੑͷͨΊͷػೳ • طଘػೳͷ֦ு
ංେԽ͢ΔΞϓϦέʔγϣϯ
ΞϓϦέʔγϣϯɾσʔλϕʔεϦϑΝΫλϦϯά • ݁߹ͨ͠ػೳΛίϯϙʔωϯτఏڙ • APIʹΑΔσʔλૢ࡞ͷநԽ • σʔλϕʔεύϑΥʔϚϯεվળ
ΞϓϦέʔγϣϯɾσʔλϕʔεϦϑΝΫλϦϯά
ڊେͳΞϓϦέʔγϣϯ
ਂࠁͳ • ༷มߋʹ͏ίϯϙʔωϯτमਖ਼ͱϦϦʔεෳࡶԽ ϥΠϒϥϦͷόʔδϣϯ͋͛ͳ͖Όɾɾʂ ͋ͷػೳΛऔΓࠐΉʹ͋Εͱ͜Εͱɾɾɾ • ΞϓϦέʔγϣϯؒ࿈ܞͷෳࡶԽ APIमਖ਼ʹ͏Өڹൣғௐࠪ • σʔλಉظͷෳࡶԽ
ϦΞϧλΠϜͰσʔλ͕ཉ͍͠ ΠϯσοΫεߋ৽͕ఆظ࣮ߦ
͍ͯ͘͠ࣄۀʹ߹Θͤͯɺ ΞϓϦέʔγϣϯΛ Ͳ͏εέʔϧ͍͔ͤͯ͘͞
มΘΓΏ͘ڥ • σʔλΛऔಘ͢Δʹʁ APIίʔϧʹΑΔ֬ೝʁ ΩϟογϡԿʁ • ͦΕͧΕͷαʔϏεͰͦΕͧΕͷݴޠ ͋ΔαʔϏεPHPɺ͋ΔαʔϏεͰGo ScalaͳͲ
σʔλॲཧ Ϣʔβʔใ͍߹Θͤ ใΛߋ৽ͨ͠߹Ͱ ґଘαʔϏε͕ͳ͍ͨΊͳ͠
σʔλॲཧͷෳࡶԽ Ϣʔβʔใมߋ Ϣʔβʔใআ Ϣʔβʔใ͕ݟ͔ͭΒͳ͍ͨΊ σʔλॲཧ͝ͱʹ"1*ΞΫηε ͋ͦ͜ͱͦ͜Ͱใ͕ҧ͏ʂ Ͳͷσʔλ͕ຊʁ શͯͷΞϓϦέʔγϣϯ͔Β Ωϟογϡͳ͠ͰΞΫηε ৗʹߴෛՙঢ়ଶʹ
Event / Application Side
Event? • Observerύλʔϯ • ʙͨ࣌͠ʹɺʙ͢Δ Λදݱ͢Δ • ༷ʑͳΞϓϦέʔγϣϯͰར༻͞ΕΔ
Event / Application • γεςϜཁ݅ɾػೳͱͯ͠औΓೖΕΔέʔεଟ͍ • Request͕དྷͨΒɺRouteΛىಈͤ͞Δ • ʙͷॲཧ͕ྃͨ͠Βɺϩάʹॻ͖ग़͢
public function __invoke( FulltextRequest $request ): RedirectResponse { // ొॲཧޙʹevent
try { $entity = new Entity(1, ‘testing’); $this->dispatcher->dispatch( new SinkConnect($this->usecase->run($entity)) ); } catch(\RuntimeException $e) { // Կ͔errorॲཧ } return $this->redirector->route('fulltext.index'); }
ҰͭͷΞϓϦέʔγϣϯͷ߹ • ΞϓϦέʔγϣϯͷ༷ʑͳग़དྷࣄΛ ObserverΛ࣮ͬͯ͢Δ • ΞϓϦέʔγϣϯͷΫϥε͕ංେԽͨ࣌͠ খ͞ͳΫϥεʹׂ͢Δ߹ɺ ϦϑΝΫλϦϯάʹར༻͢Δ͜ͱ • ୯ҰͷΞϓϦέʔγϣϯͰ࣮͢Δ߹ʹ༗༻
ߟྀ͢Δ͜ͱ • ΞϓϦέʔγϣϯؒͰ࿈ܞ͢Δ߹Ͳ͏͖͔͢ • ʙͨ࣌͠ʹɺʙ͢Δ ଞͷΞϓϦέʔγϣϯɾݴޠͰ࣮ߦ͞ΕΔ͔ Γग़͢ඞཁ͕͋Δ͔Ͳ͏͔
Event Sourcing
Event Sourcing • ΠϕϯτΛهͯ͠࠶ݱ͢Δύλʔϯ • ΠϕϯτΛΠϕϯτετΞʹอଘ • ه͞ΕͨΠϕϯτ͔ΒΦϒδΣΫτΛ෮ݩ • ΠϕϯτʴϩάʴΦϒδΣΫτɺΠϕϯτෆม
• ൃੜͨ͠ࣄ࣮Λ͑Δ
Event SourcingΛಋೖ͖͢Ͱͳ͍߹ • ΠϕϯτΛهͯ͠࠶ݱ͢Δඞཁ͕ͳ͍߹ • ه͞ΕͨΠϕϯτ͔Β ΦϒδΣΫτΛ෮ݩ͢Δ͜ͱ͕ͳ͍߹ • খنͳΞϓϦέʔγϣϯɺ γϯϓϧͳCRUD͔͠ͳ͍ΞϓϦέʔγϣϯ
Event Sourcing • Ͳ͏࣮ͬͯ͢Δ͔ʁ • RDBMSͱΈ߹ΘͤͯશͯͷΠϕϯτใΛอʁ • େنͳσʔλʹରԠͰ͖Δ͔ʁ • ר͖͠ͷॲཧͲ͏͢Δ͔ʁ
Asynchronous / Synchronous Event
ಉظΠϕϯτ • ΠϕϯτಉظॲཧͰ͋Δ͖͔Ͳ͏͔ Πϕϯτൃੜ࣌ʹଈ࠲ʹଞΞϓϦέʔγϣϯʹө͢Δ ඞཁ͕͋Δ͔ • ΠϕϯτൃߦɺΠϕϯτཤྺอ࣋ɺ αϒεΫϥΠόʹΑΔσʔλӬଓԽΛߦ͏
ඇಉظΠϕϯτ • ΠϕϯτඇಉظʹͰ͖Δ͔Ͳ͏͔ Πϕϯτ͕ൃੜͨ͜͠ͱΛ୲อ͠ɺ өԆͤͯ͞Α͍͔ • ΠϕϯτൃߦɺΠϕϯτཤྺอ࣋·Ͱ σʔλӬଓԽԆͰ࣮ߦ͞ΕΔ
CQRS
ΞϓϦέʔγϣϯͷͰൃੜ͢Δ • σʔλͱύϑΥʔϚϯε • αʔϏεͱڞʹ૿͑ΔෳࡶͳΫΤϦͱ༰ྔ • σʔλͷਖ਼͠͞(ਖ਼نԽ)͔ޮԽ͔(ඇਖ਼نԽ) • RDBMSͷෆಘҙ +
NoSQLʹΑΔΧόʔ ಉظํ๏ͷෳࡶԽ
σʔλϕʔεઃܭͷΈ • ਖ਼نԽͱநग़͍ͨ͠σʔλͷΪϟοϓ • நग़͍ͨ͠σʔλʹ߹ΘͤͨઃܭΛ͢Δ͜ͱʹΑΔ ੍͕͔͚ΒΕͳ͍δϨϯϚ • ࣮ίʔυͰ୲อ͢ΔͨΊʹෳࡶԽ
ཁٻ༷ʹରԠ͢ΔͨΊʹ σʔλϕʔεͰશͯରԠ͢Δͷਖ਼͍͔͠ ਖ਼نԽɺඇਖ਼نԽ ಉ࣠͡Ͱߟ͑Δ͖͔
CQRS "A few myths about CQRS". Ouarzy's Blog. http://www.ouarzy.com/2016/10/02/a-few-myths-about-cqrs/
ࢀর
CQRSͱԿ͔ • ॻ͖ࠐΈ(෭࡞༻͋Γ)ͱ ಡΈࠐΈ(෭࡞༻ͳ͠)Λ͢Δ • ෭࡞༻͋ΓσʔλͳͲʹԿΒ͔ͷมߋΛ༩͑Δͷ • ॻ͖ࠐΈ => Command
• ಡΈࠐΈ => Query
CQRS • ͋ΒΏΔϝιουɺΞΫγϣϯΛ࣮ߦ͢ΔίϚϯυ ͔ɺݺͼग़͠ݩʹσʔλΛฦ͢ΫΤϦ͔ͷ͍ͣΕ͔Ͱ ͋ͬͯɺ྆ํΛߦͬͯͳΒͳ͍ɻ͜Εɺ࣭Λ͢Δ ͜ͱͰճΛมԽͤͯ͞ͳΒͳ͍ͱ͍͏͜ͱͩɻ "Greg YoungྲྀCQRS -
Mark Nijhof". Digital Romanticism. http://d.hatena.ne.jp/digitalsoul/20100712/1278886009 ࢀর
Command • ߹ੑ ੍Λ͔͚ͯਖ਼͘͠ɺݎ͘ • ॻ͖ࠐΈɺߋ৽ɺআॲཧ ಡΈࠐΈʹൺͯޮੑɺ εέʔϥϏϦςΟΛҙࣝ͢Δ͜ͱ͋·Γͳ͍
Query • ߹ੑΑΓݕࡧޮ • ΄ͱΜͲͷΞϓϦέʔγϣϯʹ͓͍ͯɺ ॻ͖ࠐΈΑΓݕࡧͷൺॏ͕େ͖͍͜ͱ͕΄ͱΜͲ • εέʔϧ͕༰қͰ͋Δ͜ͱɺ ߴͳύϑΥʔϚϯεͰ͋Δ͜ͱ
Command, Query࣌ͷσʔλϕʔε
Command
Command
Query
CQRS Application Application
ཧ۶Θ͔Δ͚Ͳɺ Ͳ͏࣮͢Ε͍͍ͷ͔ʁ ಉظͲ͏͢Δͷʁ
Event Sourcing + CQRS
Event Sourcing / Command ྫ
Event Sourcing / Command ྫ ΞϓϦέʔγϣϯ͔Β Πϕϯτૹ৴
Event Sourcing / Command ྫ ϝοηʔδΛड͚औΓɺ ͷՃͳͲ
Event Sourcing / Command ྫ RDBMSɺNoSQLͳͲ ༻్ʹ߹Θͤͯॻ͖ࠐΈ
Event Sourcing / Command ྫ ଞͷΞϓϦέʔγϣϯ͔Β σʔλϕʔεͷΈΛࢀর Ճʹ͍ͭͯͷࣝΒͳ͍
Cache System σʔλϕʔεߋ৽ $PNNBOE σʔλϕʔεߋ৽ྃΠϕϯτ &WFOU4PVSDJOH σʔλϕʔεߋ৽ྃݕ &WFOU-JTUFOFS ΩϟογϡআͳͲ
Event Sourcing • CommandɺQueryɺEvent Sourcing ผΞϓϦέʔγϣϯɾݴޠͰ࣮Ͱ͖Δ͘Β͍ͷ γϯϓϧ͞ • EventอଘͱΞϓϦέʔγϣϯʹରԠͨ͠ QueryΛͲ͏ͬͯ
ޮతʹ࣮͢Δ͔
ΞϓϦέʔγϣϯׂྫ
ΞϓϦέʔγϣϯׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ
ΞϓϦέʔγϣϯׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ ूܭॲཧ push etc CLI։ൃνʔϜ / DWH
etc
ΞϓϦέʔγϣϯׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ ूܭॲཧ push etc CLI։ൃνʔϜ / DWH
etc ࠂ৴ܥAPI ࠂ৴։ൃνʔϜ
ΞϓϦέʔγϣϯׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ ूܭॲཧ push etc CLI։ൃνʔϜ / DWH
etc ࠂ৴ܥAPI ࠂ৴։ൃνʔϜ ϢʔβʔͷӾཡใʹج͍ͮͨ ใ͕ཉ͍͠Ͱ͢ ϦΞϧλΠϜͰ
Event Sourcing / Message Broker
Event SourcingͱMiddlewareબఆ • PubSubͰشൃੑͷͳ͍ͷΛબ͢Δ • ϝοηʔδอ͕ՄೳͰɺ࠶ݱ͢Δ͜ͱ͕Մೳͳͷ Λ࠾༻͢Δͷ͕·͍͠ • εέʔϥϒϧͰ͋Δ͜ͱ
Event Sourcing / RDBMS • PubSubͰشൃੑͷͳ͍ͷΛબ͢Δ ػೳͳ͍ͷͰόονॲཧͳͲͰ ఆظతʹσʔλՃ͕͋Δ͔Ͳ͏͔Λݕࡧ͢Δ • ϝοηʔδอ͕ՄೳͰɺ࠶ݱ͢Δ͜ͱ͕ՄೳͳͷΛ࠾༻͢Δͷ
͕·͍͠ ಘҙ • εέʔϥϒϧͰ͋Δ͜ͱ Slaveɺmulti masterͳͲͰରԠͰ͖Δ
Event Sourcing / Redis • PubSubͰشൃੑͷͳ͍ͷΛબ͢Δ PUBLISH SUBSCRIBEͳͲ͕͋ΔͷͰ࣮ݱͰ͖Δ͕ɺ شൃੑʹ͍ͭͯઃఆͰؤுΔ •
ϝοηʔδอ͕ՄೳͰɺ ࠶ݱ͢Δ͜ͱ͕ՄೳͳͷΛ࠾༻͢Δͷ͕·͍͠ τϥϯβΫγϣϯ͋Δ • εέʔϥϒϧͰ͋Δ͜ͱ ༰қʹͰ͖Δ
None
None
Message Broker
None
Apache Kafka • ZookeeperΛར༻ͨ͠ΫϥελϦϯάʹΑΔߴՄ༻ੑ • ϝοηʔδͷӬଓԽɺϨϓϦέʔγϣϯɺ࠶औಘՄ • ϏοάσʔλରԠ • ετϦʔϜରԠͷϝοηʔδϯάϛυϧΣΞ
• Kafka ConnectʹΑΔपลγεςϜͱͷߴ͍ੑ
Event Sourcing • ΠϕϯτΛΠϕϯτετΞʹอଘ Kafkaࣗମʹอଘ͢Δ͜ͱ͕Ͱ͖ɺ σʔλϕʔεʹసૹՄೳ • ه͞ΕͨΠϕϯτ͔ΒΦϒδΣΫτΛ෮ݩͰ͖Δ ॲཧ͞ΕͨΠϕϯτ࠶ൃߦՄೳ •
ΠϕϯτʴϩάʴΦϒδΣΫτɺΠϕϯτෆม ൃߦޙͷΠϕϯτΛॻ͖͑Δ͜ͱͰ͖ͳ͍ • ൃੜͨ͠ࣄ࣮Λ͑Δ τϥϯβΫγϣϯ͋Γ
Apache Kafka֓ཁ • Partition ෛՙࢄ༻్ʹར༻ ෳͷConsumer͕ͦΕͧΕͷPartitionΛࢀর͠ɺ ͦΕͧΕ͕ॲཧΛߦ͏ ॲཧϑϩʔͷσβΠϯʹΑͬͯଟ༷ͳར༻ํ๏ • librdkafka͕ඇৗʹߴ
Example Partition
Consumer
Kafka Connect • Kafka Connectͱɺ पลγεςϜ͔ΒͷσʔλΛऔΓࠐΈ(Source)ɺ σʔλૹ৴(Sink)ͷೋछྨΛαϙʔτ͢Δػೳ • Amazon SQSMongoDBͷσʔλΛKafkaͰऔࠐΉɺ
ϝοηʔδΛͦͷ··ElasticsearchRDBMSʹ֨ೲɺ ͕ߦ͑Δ • Connectࣗ༝ʹ֦ுͯ͠ಠࣗConnectΛ࣮Մೳ
Kafka Connect • γϯϓϧͳέʔεͰ͋Εɺ ಛʹ࣮͢Δ͜ͱͳ͘QueryΛαϙʔτ • ෳࡶͳσʔλΛ࡞͢ΔͷͰ͋Ε Kafka StreamsɺSpark StreamingͰσʔλՃ
None
Amazon Kinesis • εέʔϥϒϧ • ϝοηʔδ 7ؒอ(࠷େ) • ετϦʔϜରԠͷKinesis Stream
• Kinesis FirehoseΛͬͨσʔλసૹ Amazon S3ɺAmazon Redshiftɺ Amazon Elasticsearch Service etc
Event Sourcing+ CQRS / Kafka • Command QueryΛ୲͢ΔWebΞϓϦέʔγϣϯΛ γϯϓϧʹ •
Event SourcingʹΑͬͯɺΞϓϦέʔγϣϯʹՁΛ Ճ͢Δ͜ͱ͕Ͱ͖Δ(ੳͳͲ) • Command QueryͷಉظΛαϙʔτ͠ɺ ΞϓϦέʔγϣϯʹ߹Θͤͯෛՙࢄ͕༰қ
ఆظߋ৽ͤ͞Δόονॲཧͷߟ͑ํมΘΔ
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ྫ ༷ʑͳΞϓϦέʔγϣϯ͔Β σʔλૹ৴
ྫ "QBDIF,BGLB͕ ϝοηʔδड৴
ྫ ,BGLB 4QBSL4USFBNJOH ΞϓϦέʔγϣϯ͔Βૹ৴͞Εͨσʔλͱɺ 3%#.4ʹ֨ೲ͞ΕͨσʔλΛ݁߹͠ɺ ूܭɾूΛߦ͏
ྫ ूܭɾू͞ΕͨσʔλΛɺ ಡΈࠐΈͰར༻͢ΔΞϓϦέʔγϣϯʹ ߹Θͤͯอ $BTTBOESBͱ4QBSL4USFBNJOHͷΈͰ ೖग़ྗΛߦ͏έʔε
ྫ ूܭɾू͞Εͨσʔλͷ͏ͪ ༷ʑͳՕॴͰར༻͞ΕΔͷɺ)%'4 ࠶ܭࢉɺোൃੜ࣌ʹ෮چͤ͞ΔͳͲ
ྫ ΞϓϦέʔγϣϯଆ͔Β $BTTBOESBͷΈʹ͍߹ΘͤΛߦ͏
ྫ ͦΕͧΕͷΞϓϦέʔγϣϯͷ $POTVNFSͰͦΕͧΕͷॲཧ
ྫ 3BCCJU.2ϝοηʔδૹ৴ ଞαʔϏε͕ར༻
ྫ ֤αʔϏεͷίϯγϡʔϚʔ͕ ଞͷαϒγεςϜͰར༻͢ΔσʔλΛੜ
·ͱΊ • େنΞϓϦέʔγϣϯʹͳΔ͜ͱ͕༧ଌͰ͖ͨΒ • ϚΠΫϩαʔϏεΞʔΩςΫνϟΛࢧ͑Δ • ϛυϧΣΞͷࣝඞཁʹ • ࢄॲཧෳࡶͳσʔλॲཧͷ ϦϑΝΫλϦϯάʹ׆͖Δύλʔϯ