Event Sourcing,CQRS For PHP Application

PHPアプリケーションでEvent Sourcing、CQRSを実践する場合の
ミドルウェアとの組み合わせ、基本的な考え方
実例を交えた資料です

Transcript

1. Event Sourcing CQRS For PHP Application yuuki takezawa phpcon fuk 2018
2. ͸ͳ͢͜ͱ • Event • CQRS • Event Sourcing + CQRS • Event Sourcing / Message Broker • ࣮ྫ
3. ͸ͳ͞ͳ͍͜ͱ • DDD • Lambda Architecture • Kappa Architecture • Apache Sparkʹ͍ͭͯ
4. DDDͱҰॹʹड़΂ΒΕΔ͜ͱ͕ଟ͍Ͱ͕͢ɺ େن໛ͳσʔλॲཧͰ΋׆༻Ͱ͖Δύλʔϯ
5. όονॲཧ͕ଟ͍ΞϓϦέʔγϣϯ΍ɺ ෳ਺ͷσʔλϕʔεؒͰ σʔλಉظΛ͢ΔΞϓϦέʔγϣϯʹ΋
7. Event / Application Side
8. Event? • Observerύλʔϯ • ʙͨ࣌͠ʹɺʙ͢Δ Λදݱ͢Δ • PHPͷ༷ʑͳΞϓϦέʔγϣϯͰར༻͞Ε͍ͯΔ • \SplObserver, SplSubject
9. Event / PHP • Symfony Event Dispatcher • Illuminate Events (Laravel) • Zend Event Manager • RxPHP • ReactPHP
10. Event / PHP • γεςϜ౎߹ͰऔΓೖΕΔέʔε΋ଟ͍ • Request͕དྷͨΒɺRouteΛىಈͤ͞Δ • ʙͷॲཧ͕׬ྃͨ͠Βɺϩάʹॻ͖ग़͢
11. 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'); }
12. Domain Event
13. Event • υϝΠϯϞσϧ಺Ͱൃੜ͢Δग़དྷࣄ / υϝΠϯΠϕϯτ • ʙͨ࣌͠ʹɺʙ͢Δ Λදݱ͢Δ • υϝΠϯϞσϧΛލΔ΋ͷʹ஫໨͢Δ • ۀ຿తͳ؍఺͔ΒΠϕϯτͱͯ͠ѻ͏͔
 ܦաΛແࢹ͢΂͖͔Ͳ͏͔ͳͲ
14. Domain Event + Observer in PHP
15. ҰͭͷPHPΞϓϦέʔγϣϯͷ৔߹ • υϝΠϯϞσϧ಺ͷग़དྷࣄΛ
 ObserverΛ࢖࣮ͬͯ૷͢Δ • ΞϓϦέʔγϣϯͷΫϥε͕ංେԽͨ࣌͠
 খ͞ͳΫϥεʹ෼ׂ͢Δ৔߹΍ɺ
 ϦϑΝΫλϦϯάʹར༻͢Δ͜ͱ΋
 • ୯ҰͷΞϓϦέʔγϣϯ಺Ͱ࣮૷͢Δ৔߹ʹ༗༻
 (1ϓϩηεΏ͑)
16. ߟྀ͢Δ͜ͱ • ϚΠΫϩαʔϏεͰ࿈ܞ͢Δ৔߹͸Ͳ͏͢΂͖͔ • ʙͨ࣌͠ʹɺʙ͢Δ
 ଞͷΞϓϦέʔγϣϯɾݴޠͰ࣮ߦ͞ΕΔ͔
 ੾Γग़͢ඞཁ͕͋Δ͔Ͳ͏͔
17. ߟྀ͢Δ͜ͱ • ෳ਺ͷΞϓϦέʔγϣϯͱ࿈ܞͨ͠৔߹ͷো֐෮چ
 ϩάΛग़ྗ͍ͯ͠Δ͚ͩͰࡁΉ͔Ͳ͏͔ • ݁ՌΛσʔλϕʔεʹอଘ͠ɺ
 ΞϓϦέʔγϣϯͷσʔλͱͯ͠׆༻
 ݁ՌʹࢸΔ·Ͱͷաఔ͸ඞཁ͔Ͳ͏͔ • ཤྺσʔλอଘ͚ͩͰࡁΉ͔Ͳ͏͔
18. ݎ͘ɺͦͯ͠ো֐ʹ΋ڧ͍ ΞϓϦέʔγϣϯʹ͠ͳ͚Ε͹ͳΒͳ͍
19. Event Sourcing
20. Event Sourcing • ΠϕϯτΛه࿥ͯ͠࠶ݱ͢Δύλʔϯ • ΠϕϯτΛΠϕϯτετΞʹอଘ • ه࿥͞ΕͨΠϕϯτ͔ΒΦϒδΣΫτΛ෮ݩͰ͖Δ • ΠϕϯτʴϩάʴΦϒδΣΫτɺΠϕϯτ͸ෆม • ൃੜͨ͠ࣄ࣮Λ఻͑Δ
21. Event SourcingΛಋೖ͢΂͖Ͱ͸ͳ͍৔߹ • ΠϕϯτΛه࿥ͯ͠࠶ݱ͢Δඞཁ͕ͳ͍৔߹ • ه࿥͞ΕͨΠϕϯτ͔Β
 ΦϒδΣΫτΛ෮ݩ͢Δ͜ͱ͕ͳ͍৔߹ • খن໛ͳΞϓϦέʔγϣϯɺ
 γϯϓϧͳCRUD͔͠ͳ͍ΞϓϦέʔγϣϯ • ࢀরΑΓ΋ॻ͖ࠐΈ͕ϝΠϯͷΞϓϦέʔγϣϯ
22. Event Sourcing • PHPͰͲ͏΍࣮ͬͯ૷͢Δ͔ʁ • RDBMSͱ૊Έ߹ΘͤͯશͯͷΠϕϯτ৘ใΛอ؅ʁ • େن໛ͳσʔλʹ͸ରԠͰ͖Δ͔ʁ • ר͖໭͠ͷॲཧ͸Ͳ͏͢Δ͔ʁ
23. Asynchronous / Synchronous Event
24. ಉظΠϕϯτ • Πϕϯτ͸ಉظॲཧͰ͋Δ΂͖͔Ͳ͏͔
 Πϕϯτൃੜ࣌ʹଈ࠲ʹଞΞϓϦέʔγϣϯʹ൓ө͢Δ ඞཁ͕͋Δ͔ • ΠϕϯτൃߦɺΠϕϯτཤྺอ࣋ɺ
 αϒεΫϥΠόʹΑΔσʔλӬଓԽΛߦ͏
25. ඇಉظΠϕϯτ • Πϕϯτ͸ඇಉظʹͰ͖Δ͔Ͳ͏͔
 Πϕϯτ͕ൃੜͨ͜͠ͱΛ୲อ͠ɺ
 ଞΞϓϦέʔγϣϯ΁ͷ൓ө͸஗Ԇͤͯ͞΋Α͍͔ • ΠϕϯτൃߦɺΠϕϯτཤྺอ࣋·Ͱ
 σʔλӬଓԽ͸஗ԆͰ࣮ߦ͞ΕΔ
 (χΞϦΞϧλΠϜఔ౓)
26. CQRS
27. ΞϓϦέʔγϣϯͷ੒௕Ͱൃੜ͢Δ໰୊ • σʔλϞσϧͱύϑΥʔϚϯε • αʔϏε੒௕ͱڞʹ૿͑ΔෳࡶͳΫΤϦͱ૿͑Δ༰ྔ • σʔλͷਖ਼͠͞(ਖ਼نԽ)͔ޮ཰Խ͔(ඇਖ਼نԽ) • RDBMSͷෆಘҙ෼໺ + NoSQLʹΑΔΧόʔ
 ಉظํ๏ͷෳࡶԽ
28. σʔλϕʔεઃܭͷ೰Έ • ਖ਼نԽͱநग़͍ͨ͠σʔλͷΪϟοϓ • நग़͍ͨ͠σʔλʹ߹ΘͤͨઃܭΛ͢Δ͜ͱʹΑΔ
 ੍໿͕͔͚ΒΕͳ͍δϨϯϚ • ࣮૷ίʔυͰ୲อ͢ΔͨΊʹෳࡶԽ • ಛఆͷσʔλϕʔεʹରͯ͠ͷCRUDʹґଘͨ͠ߟ͑
29. ਖ਼نԽ͸͢΂͖ʂ
30. ϏδωεཁٻʹରԠ͢ΔͨΊʹ
 σʔλϕʔεͰશͯରԠ͢Δͷ͸ਖ਼͍͔͠ ਖ਼نԽɺඇਖ਼نԽ͸
 ಉ࣠͡Ͱߟ͑Δ΂͖Ͱ͸ͳ͍
31. Ϗδωεཁٻ γεςϜ౎߹(ϑϨʔϜϫʔΫͳͲ) Ϋϥεઃܭ γϯϓϧ͞ ύϑΥʔϚϯε
32. CQRS "A few myths about CQRS". Ouarzy's Blog. 
 http://www.ouarzy.com/2016/10/02/a-few-myths-about-cqrs/ ࢀর
33. CQRSͱ͸Կ͔ • ॻ͖ࠐΈ(෭࡞༻͋Γ)ͱ
 ಡΈࠐΈ(෭࡞༻ͳ͠)Λ෼཭͢Δ • ෭࡞༻͋Γ͸σʔλͳͲʹԿΒ͔ͷมߋΛ༩͑Δ΋ͷ
 • ॻ͖ࠐΈ => Command
 • ಡΈࠐΈ => Query
34. CQRS • ͋ΒΏΔϝιου͸ɺΞΫγϣϯΛ࣮ߦ͢ΔίϚϯυ ͔ɺݺͼग़͠ݩʹσʔλΛฦ͢ΫΤϦ͔ͷ͍ͣΕ͔Ͱ ͋ͬͯɺ྆ํΛߦͬͯ͸ͳΒͳ͍ɻ͜Ε͸ɺ࣭໰Λ͢Δ ͜ͱͰճ౴ΛมԽͤͯ͞͸ͳΒͳ͍ͱ͍͏͜ͱͩɻ
 
 "Greg YoungྲྀCQRS - Mark Nijhof". Digital Romanticism. 
 http://d.hatena.ne.jp/digitalsoul/20100712/1278886009 ࢀর 

35. Command • ੔߹ੑ
 ੍໿Λ͔͚ͯਖ਼͘͠ɺݎ͘ • ॻ͖ࠐΈɺߋ৽ɺ࡟আॲཧ͸
 ಡΈࠐΈʹൺ΂ͯޮ཰ੑ΍଎౓ɺ
 εέʔϥϏϦςΟΛҙࣝ͢Δ͜ͱ͸͋·Γͳ͍
36. Query • ੔߹ੑΑΓ΋ݕࡧޮ཰ • ΄ͱΜͲͷΞϓϦέʔγϣϯʹ͓͍ͯɺ
 ॻ͖ࠐΈΑΓ΋ݕࡧͷൺॏ͕େ͖͍͜ͱ͕΄ͱΜͲ • εέʔϧ͕༰қͰ͋Δ͜ͱɺ
 ߴ଎ͳύϑΥʔϚϯεͰ͋Δ͜ͱ
37. PHPΞϓϦέʔγϣϯ޲͚
 Command, Query෼཭࣌ͷσʔλϕʔε
38. Command
39. Query
40. Query
41. Query
42. Query
43. Query
44. Query
45. CQRS Application Application
46. ཧ۶͸Θ͔Δ͚Ͳɺ Ͳ͏࣮૷͢Ε͹͍͍ͷ͔ʁ ಉظ͸Ͳ͏͢Δͷʁ
47. Event Sourcing + CQRS
48. Event Sourcing / Command Event Application Command RDBMS
49. Event Sourcing / Command Event Application Command RDBMS ΞϓϦέʔγϣϯ͔Β ॻ͖ࠐΈࢦࣔ(class)
50. Event Sourcing / Command Event Application Command RDBMS ΞϓϦέʔγϣϯ͔Β ॻ͖ࠐΈࢦࣔ(class) σʔλϕʔεʹinsert
51. Event Sourcing / Command Event Application Command RDBMS ΞϓϦέʔγϣϯ͔Β ॻ͖ࠐΈࢦࣔ(class) σʔλϕʔεʹinsert ਖ਼ৗʹॻ͖ࠐ·Εͨ ࣄ࣮Λฦ٫
52. Event Sourcing / Command Event Application Command RDBMS ΞϓϦέʔγϣϯ͔Β ॻ͖ࠐΈࢦࣔ(class) σʔλϕʔεʹinsert ਖ਼ৗʹॻ͖ࠐ·Εͨ ࣄ࣮Λฦ٫ ࣄ࣮ʹج͍ͮͨ
 ΠϕϯτΛൃߦ
53. Event Sourcing / Command Event Application Command RDBMS Transaction
54. Event Sourcing / Query Event / Listener Application NoSQL Query
55. Event Sourcing / Query Event / Listener Application NoSQL Query EventͷൃߦΛݕ஌͠ NoSQLʹσʔλΛૠೖ
56. Event Sourcing / Queryྫ Event / Listener Application NoSQL Query EventͷൃߦΛݕ஌͠ NoSQLʹσʔλΛૠೖ Application͔ΒQuery
 நग़໰͍߹Θͤ
57. Event Sourcing / Query Event / Listener Application NoSQL Query EventͷൃߦΛݕ஌͠ NoSQLʹσʔλΛૠೖ Application͔ΒQuery
 நग़໰͍߹Θͤ NoSQLʹ໰͍߹Θͤ υϝΠϯʹ࠷దԽ͞Εͨ΋ͷΛظ଴
58. Event Sourcing / Query Event / Listener Application NoSQL Query EventͷൃߦΛݕ஌͠ NoSQLʹσʔλΛૠೖ Application͔ΒQuery
 நग़໰͍߹Θͤ NoSQLʹ໰͍߹Θͤ υϝΠϯʹ࠷దԽ͞Εͨ΋ͷΛظ଴ ݁ՌΛฦ͢ͷΈ
59. Cache System σʔλϕʔεߋ৽
 $PNNBOE σʔλϕʔεߋ৽׬ྃΠϕϯτ
 &WFOU
    4PVSDJOH σʔλϕʔεߋ৽׬ྃݕ஌
 &WFOU
    -JTUFOFS Ωϟογϡ࡟আͳͲ
60. Structure Event Publisher Command Query Event Subscriber
61. Structure Event Publisher Command Query Event Subscriber ੹຿͸ॻ͖ࠐΈͷΈ
62. Structure Event Publisher Command Query Event Subscriber ੹຿͸ॻ͖ࠐΈͷΈ ੹຿͸ಡΈࠐΈͷΈ
63. Structure Event Publisher Command Query Event Subscriber ੹຿͸ॻ͖ࠐΈͷΈ ੹຿͸ಡΈࠐΈͷΈ ੹຿͸Eventૹ৴ͷΈ
64. Structure Event Publisher Command Query Event Subscriber ੹຿͸ॻ͖ࠐΈͷΈ ੹຿͸ಡΈࠐΈͷΈ ੹຿͸Eventૹ৴ͷΈ ੹຿͸Eventड৴ͱ
 ॻ͖ࠐΈ
65. Event Sourcing • CommandɺQueryɺEvent Sourcing͸
 ผΞϓϦέʔγϣϯɾݴޠͰ࣮૷Ͱ͖Δ͘Β͍ͷ
 γϯϓϧ͞ • EventอଘͱυϝΠϯʹରԠͨ͠QueryΛͲ͏΍ͬͯ
 ޮ཰తʹ࣮૷͢Δ͔
66. ΞϓϦέʔγϣϯ෼ׂྫ
67. ΞϓϦέʔγϣϯ෼ׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ
68. ΞϓϦέʔγϣϯ෼ׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ ूܭॲཧ push etc CLI։ൃνʔϜ / DWH etc
69. ΞϓϦέʔγϣϯ෼ׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ ूܭॲཧ push etc CLI։ൃνʔϜ / DWH etc ޿ࠂ഑৴ܥAPI ޿ࠂ഑৴։ൃνʔϜ
70. ΞϓϦέʔγϣϯ෼ׂྫ PHP WebΞϓϦέʔγϣϯ webΞϓϦ։ൃνʔϜ ूܭॲཧ push etc CLI։ൃνʔϜ / DWH etc ޿ࠂ഑৴ܥAPI ޿ࠂ഑৴։ൃνʔϜ ϢʔβʔͷӾཡ৘ใʹج͍ͮͨ ৘ใ͕ཉ͍͠Ͱ͢ ϦΞϧλΠϜͰ
71. Event Sourcing / Message Broker
72. Event SourcingͱMiddlewareબఆ • PubSubͰشൃੑͷͳ͍΋ͷΛબ୒͢Δ • ϝοηʔδอ؅͕ՄೳͰɺ࠶ݱ͢Δ͜ͱ͕Մೳͳ΋ͷ Λ࠾༻͢Δͷ͕๬·͍͠ • εέʔϥϒϧͰ͋Δ͜ͱ
73. Event Sourcing / RDBMS • PubSubͰشൃੑͷͳ͍΋ͷΛબ୒͢Δ
 ͦΜͳػೳ͸ͳ͍ͷͰόονॲཧͳͲͰ
 ఆظతʹσʔλ௥Ճ͕͋Δ͔Ͳ͏͔Λݕࡧ͢Δ
 • ϝοηʔδอ؅͕ՄೳͰɺ࠶ݱ͢Δ͜ͱ͕Մೳͳ΋ͷΛ࠾༻͢Δͷ ͕๬·͍͠
 ಘҙ෼໺ • εέʔϥϒϧͰ͋Δ͜ͱ
 SlaveͳͲΛ૿΍͢͜ͱͰରԠ͸Ͱ͖Δ
74. Event Sourcing / Redis • PubSubͰشൃੑͷͳ͍΋ͷΛબ୒͢Δ
 PUBLISH SUBSCRIBEͳͲ͕͋ΔͷͰ࣮ݱ͸Ͱ͖Δ͕ɺ
 شൃੑʹ͍ͭͯ͸ઃఆͰؤுΔ
 • ϝοηʔδอ؅͕ՄೳͰɺ
 ࠶ݱ͢Δ͜ͱ͕Մೳͳ΋ͷΛ࠾༻͢Δͷ͕๬·͍͠
 ͋·ΓಘҙͰ͸ͳ͍(τϥϯβΫγϣϯͳ͠) • εέʔϥϒϧͰ͋Δ͜ͱ
 ༰қʹͰ͖Δ
76. Message Broker
78. Apache Kafka • ZookeeperΛར༻ͨ͠ΫϥελϦϯάʹΑΔߴՄ༻ੑ • ϝοηʔδͷӬଓԽɺϨϓϦέʔγϣϯɺ࠶औಘՄ • ϏοάσʔλରԠ • ετϦʔϜରԠͷϝοηʔδϯάϛυϧ΢ΣΞ • Kafka ConnectʹΑΔपลγεςϜͱͷߴ͍਌࿨ੑ
 (Amazon kinesisͱ΄΅ಉ͡)
79. Event Sourcing • ΠϕϯτΛΠϕϯτετΞʹอଘ
 Kafkaࣗମʹอଘ͢Δ͜ͱ͕Ͱ͖ɺ
 σʔλϕʔεʹసૹՄೳ • ه࿥͞ΕͨΠϕϯτ͔ΒΦϒδΣΫτΛ෮ݩͰ͖Δ
 ॲཧ͞ΕͨΠϕϯτ͸࠶ൃߦՄೳ • ΠϕϯτʴϩάʴΦϒδΣΫτɺΠϕϯτ͸ෆม
 ൃߦޙͷΠϕϯτΛॻ͖׵͑Δ͜ͱ͸Ͱ͖ͳ͍ • ൃੜͨ͠ࣄ࣮Λ఻͑Δ
 τϥϯβΫγϣϯ͋Γ
80. ϝοηʔδͷܽଛʹ͍ͭͯ ૹ৴ࣦഊ BDLड৴ࣦഊ #SPLFSμ΢ϯ ϝοηʔδड৴ࣦഊ
81. ϝοηʔδ఻ୡͷอূ • At least once semantics
 ॏෳΛڐՄ • At most once semantics
 ܽଛΛڐՄ • Exactly once semantics
 ॏෳɺ͓ΑͼܽଛΛڐՄ͠ͳ͍
 
 "Exactly-once Semantics are Possible: Here’s How Kafka Does it". Confluent APACHE KAFKA. 
 https://www.confluent.io/blog/exactly-once-semantics-are-possible-heres-how-apache-kafka-does-it/ ࢀর
82. Performance?
83. Apache Kafka֓ཁ • Partition
 ෛՙ෼ࢄ༻్ʹར༻
 ෳ਺ͷConsumer͕ͦΕͧΕͷPartitionΛࢀর͠ɺ
 ͦΕͧΕ͕ॲཧΛߦ͏
 ॲཧϑϩʔͷσβΠϯʹΑͬͯଟ༷ͳར༻ํ๏ • librdkafka͕ඇৗʹߴ଎
 PHPͰ͸rdkafka(librdkafkaϥοϓ)
84. Example Partition
85. Performance • confluent: 250000 records, 34.84177593s • sarama-cluster: 250000 records, 2m20.614963038s
 • confluent was almost 5x faster on the read.
86. Consumer
87. Kafka Connect • Kafka Connectͱ͸ɺ
 पลγεςϜ͔ΒͷσʔλΛऔΓࠐΈ(Source)ɺ
 σʔλૹ৴(Sink)ͷೋछྨΛαϙʔτ͢Δػೳ • Amazon SQS΍MongoDBͷσʔλΛKafkaͰऔࠐΉɺ
 ϝοηʔδΛͦͷ··Elasticsearch΍RDBMSʹ֨ೲɺ
 ͕ߦ͑Δ • Connect͸ࣗ༝ʹ֦ுͯ͠ಠࣗConnectΛ࣮૷Մೳ
88. Kafka Connect • γϯϓϧͳέʔεͰ͋Ε͹ɺ
 ಛʹ࣮૷͢Δ͜ͱͳ͘QueryΛαϙʔτ • Consumer͸ผΞϓϦέʔγϣϯͱͯ͠
 ෼ׂ͢Δͷ΋͍͍Ͱ͠ΐ͏ • ෳࡶͳσʔλΛ࡞੒͢ΔͷͰ͋Ε͹
 ConsumerͰσʔλΛ૊Έ߹ΘͤΔ
89. Structure Event Publisher Command Query Event Subscriber Application ੹຿͸ಡΈࠐΈͷΈ ੹຿͸Eventૹ৴ͷΈ WebΞϓϦέʔγϣϯ ͔Β੾Γग़͢
90. Event Sourcing+ CQRS / Kafka • Command QueryΛ୲౰͢ΔWebΞϓϦέʔγϣϯΛ
 γϯϓϧʹ • Event SourcingʹΑͬͯɺΞϓϦέʔγϣϯʹՁ஋Λ௥ Ճ͢Δ͜ͱ͕Ͱ͖Δ(෼ੳͳͲ) • Command QueryͷಉظΛαϙʔτ͠ɺ
 ΞϓϦέʔγϣϯʹ߹Θͤͯෛՙ෼ࢄ͕༰қ
91. ఆظߋ৽ͤ͞Δόονॲཧͷߟ͑ํ΋มΘΔ
92. ྫ
93. Example
94. Example: Produce Ϣʔβʔͷ࣌ܥྻߦಈϩά͕
    QIQ
    SELBGLBܦ༝ͰૹΒΕͯ͘Δ
95. Example: Kafka "QBDIF
    ,BGLB
    
    "QBDIF
    ;PPLFFQFS
    
    QBSUJUJPO
    
    ϲ݄͘Β͍Ͱԯ͘Β͍
 ΞϓϦέʔγϣϯ΁ͷো֐ɾऔΓ͜΅͠ͳ͠
96. Example: Consume σʔλϕʔεΛ݁߹ͯ͠ϏδωεϩδοΫٵऩ
    QVTI௨஌ࢦࣔͳͲΠϕϯτΛૹ৴
    ଞαʔϏε͕SBCCJUNRΛ࢖͍ͬͯΔͨΊ
97. Example: Cassandra $BTTBOESB
    
    $MVTUFS
    ԯͪΐͬͱ͘Β͍ 55-͋ΓͷͨΊ
    ো֐ͳ͠ɾίϯύΫγϣϯఆظ࣮ߦͰ
    τϥϒϧͳ͠
98. Example: Cassandra ͜͜·Ͱ਺NTҎ಺Ͱऴྃ͢ΔͨΊɺ
    ΄΅ϦΞϧλΠϜͰ൓ө͞ΕΔ
99. ଞ • ίϯςϯπͷσʔλΛKafkaܦ༝Ͱऩू͠HDFS֨ೲ
 SparkʹΑΔ෼ੳॲཧޙ Cassandra֨ೲ
 ΞϓϦέʔγϣϯ͔Β͸Cassandraʹ
 γϯϓϧͳΫΤϦΛ౤͛ΔͷΈʹ • Event Sourcing, CQRSͷ૊Έ߹ΘͤʹΑΓ
 Ωϟογϡੜ੒΍σʔλ࠷దԽʹΑΓߴ଎Խʹߩݙ

100. Now
101. େࡶ೺ͳαϯϓϧ͸ԼهΛࢀর͍ͩ͘͞
 https://github.com/ytake/laravel-presto- kafka-demo
102. ·ͱΊ • େن໛ʹͳΔ͜ͱ͕༧ଌͰ͖ͨΒ
 ಋೖʹνϟϨϯδ • ҰͭͷϑϨʔϜϫʔΫ͚ͩͰ΍Ζ͏ͱ͠ͳ͍͜ͱ • ϛυϧ΢ΣΞͷ஌ࣝ͸ඞཁʹ • DDDͷ؍఺͚ͩͰ͸ͳ͘ɺ
 ෼ࢄॲཧ΍ෳࡶͳσʔλॲཧͷ
 ϦϑΝΫλϦϯάʹ΋׆͖Δύλʔϯ