스프링캠프 2023 - 대규모 엔터프라이즈 시스템 개선 경험기 1부

스프링캠프 2023 - 대규모 엔터프라이즈 시스템 개선 경험기 1부 : 달리는 기차의 바퀴 갈아 끼우기
- 전통적인 시스템의 결합도
- Refactoring VS Rewriting
- 새로운 코드 : 새 술, 새 부대에
- 새로운 시스템으로의 이동
- 품질과 끈기

Transcript

1. ੐ഋక, 2023-04-22 ؀ӏݽ ূఠ೐ۄ੉ૉ दझమ ѐࢶ ҃೷ӝ 1ࠗ ׳ܻח ӝର੄ ߄௰ тই ՙ਋ӝ
2. ѐߊ੗ীѱ ѐߊ੉ۆ?
3. The Feynman Problem-Solving Algorithm 1. write down the problem 2. think very hard 3. write down the answer.
4. ա ӝמҳഅ ੢গ
5. ա ܻಂష݂ ੢গ
7. ݒ ࣽр ѐߊ੗о ӓࠂ೧ঠ ೞח Ѫ ف۰਑
8. ઑ৔ഐ, য়࠳ં౟: ௏٘۽ ੉೧ೞח ё୓૑ೱ ࢸ҅ “ਬ૑ࠁࣻࢿ੉ ݾ಴׮. 
 ৈӝࢲ ਬ૑ࠁࣻࢿ੉ۆ ف۰਑ হ੉, ઱੷ೣ হ੉, 
 ੷೦х হ੉ ௏٘ܳ ߸҃ೡ ࣻ ੓ח מ۱ਸ ݈ೠ׮.”
9. ӝദ౱ 
 ਃҳࢎ೦ ۨѢद दझమ ѐߊ੗
10. दפয ઱פয 2019. 09. 01
11. ۨѢद গ೒ܻா੉࣌ ۨѢद ߓ஖ EDA ױਤ పझ౟ DDD EC Object-Oriented ಁఢ
12. ਊয ࢸݺ ҳӖҗ ChatGPT ীѱ ޛযࠁࣁਃ
13. ੐ഋక (PL;CO) • ֎੉ߡ ࣳೝ஠ఎ۽Ӓ ѐߊ • 11ߣо(SK೒ې׫) ಕ੉ݢ౟ ѐߊ • ੉झ౟ࣗ೐౟ ঌডࢲߡ ѐߊ • KSUG ੌԴױ
 placebo.coder@gmail.com
14. ؀ӏݽ ূఠ೐ۄ੉ૉ दझమ ѐࢶ ҃೷ӝ 1ࠗ ׳ܻח ӝର੄ ߄௰ тই ՙ਋ӝ • ੹ా੸ੋ दझమ੄ Ѿ೤ب • Refactoring VS Rewriting • ࢜۽਍ ௏٘ : ࢜ ࣿ, ࢜ ࠗ؀ী • ࢜۽਍ दझమਵ۽੄ ੉ز • ಿ૕җ Տӝ
15. ੹ా੸ੋ दझమীࢲ੄ ֫਷ Ѿ೤ب
16. ؘ੉ఠ߬੉झ ҕਬ ࢲ࠺झ৬ ࣗ೐౟ਝয ૓ച੄ ߷ • SW ҳഅҗ ҙܻ੄ ബਯ 
 → ޖѾࢿҗ ҕਬ੄ ଼੐ਸ DBী ਤ੐ • ࢲ࠺झ, SW, ઑ૒੉ ࢿ੢
 → ৘ஏ࠺ਊ੉ ૐо • ౠ੉੼ਸ ֈযࢶ ҃਋ 
 → ӝࣿ ࠗ଻ әૐ
17. ௑ਝ੉੄ ߨ஗(Conway's law) “ࣗ೐౟ਝয ҳઑח ೧׼ ࣗ೐౟ਝযܳ ѐߊೠ 
 ઑ૒੄ ழޭפா੉࣌ ҳઑܳ ׵ѱ ػ׮.”
18. ೯ਤ ઺ࠂ ௏٘ ઺ࠂ੄ য়೧ • ࣗझ௏٘ ઺ࠂ = ӝࣿ ࠗ଻ • ࣗझ௏٘ 1 ѐ & API N ѐ
 : ੉ݫੌ ਬബࢿ Ѩࢎ 1 ѐ & ੉ݫੌ ੑ۱ API 5 ѐ • ࣗझ௏٘ ҕਬ ≒ ӝࣿ ࠗ଻ ഥೖ
19. ࠳ۮ ݓې೐ܽ, ѱܻ ಫܻझ, ؘ੉ࡁ ਝझ౟, ೻٘ ಌझ౟ Object-Oriented Analysis & Design “઺ࠂ ௏٘ܳ ୶࢚ചೞৈ Ս૘যղח Ѫ਷ DRY (Don't Repeat Yourself) ܳ ࢎਊೞח જ਷ ୹ߊ੼੉૑݅, ӒѪ੉ ੹ࠗח ইתפ׮. 
 ৈ۞࠙੉ ઺ࠂ ௏٘ܳ ೖೞ۰Ҋ ೞח Ѫ਷ ࢎप п ӝמҗ ਃҳࢎ೦ਸ ೠ ߣ݅ ҳഅೞ۰Ҋ ֢۱ೞח Ѫੑפ׮.”
20. ؘ੉ఠ ޖѾࢿ ҙܻ ࠺ਊ ࢲ࠺झ ࢿ੢җ ޖѾࢿ • ؘ੉ఠ ޖѾࢿ = ࢲ࠺झ ಿ૕ • ؘ੉ఠ ޖѾࢿਸ DB ਤ੐ 
 → ੌ੿ ӏݽ ੉ೞীࢲח ѐߊ ബਯ ࠗҗ • ࢲ࠺झ ࢿ੢җ ೯ਤ ઺ࠂ ૐо 
 → ؘ੉ఠ ޖѾࢿ ਬ૑, ҙܻ ࠺ਊ ૐо
21. Refactoring VS Rewriting
22. ؊ ੉࢚ ਬ૑ࠁࣻ غ૑ ঋח ѐߊ بҳ৬ 
 ࠺૑פझ ௏٘৬੄ Ѿ೤بо ֫਺
23. ܻಂష݂ਸ ਤೠ ୭ࣗೠ੄ పझ౟ ੘ࢿҗ 
 प೯ ࠺ਊ, दр, ߧਤب ৘ஏೡ ࣻ হ਺
24. গ೒ܻா੉࣌ р੄ Ѿ೤بܳ ѐࢶೞӝ ਤ ೧ ࢜܂ѱ ୶࢚ച ػ ҳઑ৬ ݽ؛੉ ೙ਃ
25. য়۽૑ ѐߊ౱݅੄ ֢۱ ৻ࠗ੄ ੉೧৬ ૑ਗহ੉ ೤פ׮
27. ࢜۽਍ ௏٘ : ࢜ ࣿ, ࢜ ࠗ؀ী FIG APPLICATON
28. Layered Architecture Port & Adapter Pattern Modular Monolith
29. + ਋ܻ ѐߊ੗ٜ੄ ਃҳࢎ೦ FIG গ೒ܻா੉࣌਷ 
 ࢲ࠺झ ਃҳࢎ೦ ׳ࢿ੉ ݾ੸
30. + ਋ܻ ѐߊ੗ٜ੄ ਃҳࢎ೦ FIG গ೒ܻா੉࣌਷ 
 ࢲ࠺झ ਃҳࢎ೦ ׳ࢿ੉ ݾ੸ ਃҳࢎ೦ ೧Ѿਸ ਤೠ 
 જ਷ ࢸ҅ ಿ૕ਸ о૑Ҋ ੓যঠ ೣ
32. ࢲ࠺झ җઁо द੘ؼ ٸ प೯ оמೠ
34. ࢜۽਍ दझమਵ۽੄ ੉ز
35. ରࣁ؀ ೐۽ં౟ BIGBANG (Cut-over) ೐۽ં౟
36. ରࣁ؀ ೐۽ં౟ ղ ઱߸ীࢲ ࠻ߛ੉ द੘غӝ য۰਍ ੉ਬ • ਃҳࢎ೦਷ ૑ࣘ੸ਵ۽ ૑ਗ೧ঠ ೞݴ 
 ੉ח SW ಿ૕ࠁ׮ ਋ࢶೞৈ ৘࢑җ ੋ۱ਸ ࢎਊ • दझమীࢲ ੌ੿ ӏݽ ੉࢚ਸ ߸҃ೞӝ ਤ೧ࢲח 
 ؀ӏݽ੄ ੋ۱җ ݆਷ दрਸ ࣗ࠺ • ੷ࣻળ੄ SW ಿ૕۽ ੋೠ Ҋా਷ 
 ӝദ౱, ࢎস౱੉ ইצ ѐߊ౱੄ ݿ੉׮.
37. ׮ܲ ੹ۚ੉ ೙ਃ
38. Strangler Fig Application Strangler Pattern
41. Martin Fowler, StranglerFigApplication “The most important reason to consider a strangler fig application over a cut-over rewrite is reduced risk.”
43. Object Oriented Domain Driven Design Event Driven Architecture Eventual Consistency
44. Keep It Simple Stupid ױࣽೣ
45. ױࣽೣ ≠ औ׮
46. ѐ֛੄ ࠗ੤৬ ױࣽೣ Object-Oriented 
 & Domain Driven Design
47. ѐ֛੄ ࠗ੤ ੌҙࢿ੄ ೙ਃ • OO ৬ DDD ח ࣗ೐౟ਝয ࢸ҅ী ੌҙࢿҗ ݓۅਸ ࠗৈ • ੌҙࢿҗ ݓۅ਷ ୶࢚ച ӝࠄ ੤ܐ • ୶࢚ച۽ࠗఠ ঳਷ ݽ؛਷ ઱ਃ ҙबࢎ • ݽ؛਷ ࣗ೐౟ਝযী ױࣽೣਸ ࠗৈ
48. ѐ֛੄ ࠗ੤ ੌҙࢿ੄ ೙ਃ • OO ৬ DDD ח ࣗ೐౟ਝয ࢸ҅ী ੌҙࢿҗ ݓۅਸ ࠗৈ • ੌҙࢿҗ ݓۅ਷ ୶࢚ച ӝࠄ ੤ܐ • ୶࢚ച۽ࠗఠ ঳਷ ݽ؛਷ ઱ਃ ҙबࢎ • ݽ؛਷ ࣗ೐౟ਝযী ױࣽೣਸ ࠗৈ ୓҅੸੉Ҋ ֤ܻ੸ੋ җ੿ীࢲ ೞաঀ ߊѼ೧աоঠ ೣ
49. ੋఠಕ੉झ৬ ੉߮౟ Event Driven Architecture 
 & Event Consistency
50. ੋఠಕ੉झۆ?
51. ઑ৔ഐ, ё୓૑ೱ੄ ࢎपҗ য়೧: ৉ೡ, ଼੐, ഈ۱ ҙ੼ীࢲ ࠄ ё୓૑ೱ “ੌ߈੸ਵ۽ ੋఠಕ੉झۆ যڃ ف ࢎޛ੉ ݃઱஖ח ҃҅ ૑੼ীࢲ ࢲ۽ ࢚ഐ੘ਊೡ ࣻ ੓ѱ ੉য઱ח ߑ ߨ੉ա ੢஖ܳ ੄޷ೠ׮.”
52. ੉߮౟ۆ?
53. Wikipedia, Event-driven architecture, K. Mani Chandy Event-driven Applications, California Institute of Technology, 2006 “An event can be defined as a significant change in state”
55. ੋఠಕ੉झ۽ ݫद૑ܳ Үജ ≠ ੉߮౟۽ ݫद૑ܳ ੹౵
56. ਃ୒੗ ਽׹੗ ੋఠಕ੉झ
58. Wikipedia, Publish–subscribe pattern “subscribers express interest in one or more classes and only receive messages that are of interest, without knowledge of which publishers, if any, there are.”
59. ޖѾࢿҗ Eventual Consistency ੸੺ೠ ؘ੉ఠ ޖѾࢿ ҙܻ • ݽ؛, ѐ୓(Entity) ױਤ੄ ੉߮౟۽ ؘ੉ఠ ޖѾࢿ ਬ૑ • ੌҙػ ױਤ۽ ؘ੉ఠ ޖѾࢿ ҙܻ 
 → ޖѾࢿ ҳഅ, ҙܻ ੺ରী ױࣽೣ • ޖѾࢿ ױਤ ղীࢲ੄ וटೠ Ѿ೤ب
 → ࠼ড೧૓ ؘ੉ఠ ޖѾࢿ • ҳഅ, ҙܻ੄ ױࣽೣҗ ޖѾࢿ ъب р੄ ౟ۨ੉٘ য়೐
60. ޖѾࢿҗ Eventual Consistency ੸੺ೠ ؘ੉ఠ ޖѾࢿ ҙܻ • ݽ؛, ѐ୓(Entity) ױਤ੄ ੉߮౟۽ ؘ੉ఠ ޖѾࢿ ਬ૑ • ੌҙػ ױਤ۽ ؘ੉ఠ ޖѾࢿ ҙܻ 
 → ޖѾࢿ ҳഅ, ҙܻ ੺ରী ױࣽೣ • ޖѾࢿ ױਤ ղীࢲ੄ וटೠ Ѿ೤ب
 → ࠼ড೧૓ ؘ੉ఠ ޖѾࢿ • ҳഅ, ҙܻ੄ ױࣽೣҗ ޖѾࢿ ъب р੄ ౟ۨ੉٘ য়೐ ׮নೞҊ ೂࠗೠ ੉߮౟۽ ӓࠂ
61. ૓૞ ࢜۽਍ दझమਵ۽੄ ੉ز
62. 1. ۨѢद दझమীࢲ੄ فߣ ॳӝ
63. DB ഥਗ Module Repo. API Client ۨѢद গ೒ா੉࣌
64. DB ഥਗ V1 Module Repo. API Client ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ DB WRITE
65. ৵ Repository ীࢲ 
 فߣ ॳӝܳ ࣻ೯೧ঠ ೡөਃ?
66. ৵ API ীࢲ فߣ ॳӝ ਃ୒ਸ ߉ਸөਃ?
67. ۨѢद গ೒ܻா੉࣌ FIG গ೒ܻா੉࣌ ଵৈ੗ Repository API ଼੐ ё୓੄ ৔ࣘച৬ ੋझఢझച ৻ࠗ۽ࠗఠ ਃ୒җ ਽׹ FIG APP ژ ׮ܲ ੷੢ࣗ N/A ۨѢद APP N/A ژ ׮ܲ ௿ۄ੉঱౟
68. 2. ؘ੉ఠ ݃੉Ӓۨ੉࣌
69. Client V2 DB ഥਗ V1 Module Repo. API Client V1 ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ DB WRITE READ ௿ۄ੉঱౟ API ࢜۽਍ ਃҳࢎ೦ ୶о/ࣻ੿
 =100% < 100% First(Primary) Second(ary)
70. ݃੉Ӓۨ੉࣌਷ ߈ࠂؼ ࣻ ੓਺ਸ Ҋ۰
71. ݃੉Ӓۨ੉࣌਷ ߈ࠂؼ ࣻ ੓਺ਸ Ҋ۰ ୶࢚ച ݽ؛੄ ࢿ੢਷ ҍ ؘ੉ఠ ҳࢿ ߸҃
72. 3. ۨѢद दझమ੄ DB ੍ӝ݅ ੹ജ
73. DB ഥਗ V1 Module Repo. API Client V1 ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ DB WRITE Client V2 READ READ READ WRITE WRITE =100% = 100%
74. ۨѢद গ೒ܻா੉࣌ীࢲ 
 DB ప੉࠶ ॳӝח ৵ թѹ لөਃ?
76. 4. ߊ೯-ҳة ಁఢਵ۽ ۨѢद DB ॳӝ
77. DB ഥਗ V1 Module Repo. API Client V1 ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ DB WRITE Client V2 READ READ WRITE First(Primary) Second(ary) Second(ary) First(Primary)
78. DB ഥਗ V1 Module Repo. API ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ DB WRITE WRITE First(Primary) Second(ary) WRITE WRITE Second(ary) First(Primary)
79. ৵ উؼөਃ?
80. ҙܻ ࠺ਊ੄ ૐо • FIG ৬ ۨѢद р ࢚ഐ ଵઑ
 → दझమ੄ ࠂ੟ب ૐо • FIG ী ۨѢद ‘݅’ਸ ਤೠ ӝמ
 → ੌ߈ച غ૑ ঋ਷ ӝמ ୶о = ప੉࠶݃׮ ѐ߹ ҳഅ • ࢲ࠺झ ਃҳࢎ೦җ ҙ۲হח ҳഅ ௏٘ ૐо
 → ਃҳࢎ೦ ߸҃ द ৘ஏ ࠺ਊ ૐо
81. Publish–subscribe pattern
82. ഥਗ V2 Module Repo. API Event FIG গ೒ா੉࣌ DB WRITE PUB SUB ? MQ • ౸ݒ ࢚ಿ ࢚క ߸҃ • ۽Ӓੋ ੌद ߸҃ • ഥਗ ঌۈ ݫद૑ ੹࣠ • ഥਗ ӂೠ ࢚క ߸҃
83. DB ഥਗ V1 Module Repo. API API ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ DB WRITE WRITE Event PUB MQ WRITE Mirror SUB Second(ary) First(Primary)
84. ৉ೡҗ ੄ઓࢿ ۨѢद दझమ DB ੄ ъੋೠ ࢤݺ۱ • FIG੄ ଼੐਷ ਃҳࢎ೦ਸ ೧Ѿ
 → ۨѢद DB ؘ੉ఠ زӝചח FIG৬ח ߹ѐ • MIRROR ੄ ଼੐ = ۨѢद दझమ ؘ੉ఠ ޖѾࢿ
 → ۨѢद গ೒ۨா੉࣌ ࣗݷ റীب ۨѢद दझమ ਬ૑ • FIG ৬ MIRROR, FIG৬ ۨѢद दझమ р੄ ੄ઓࢿ੉ হ਺ 
 → ਃҳࢎ೦ ҳഅ द ۨѢद दझమ ࣻ੿ ࠺ਊ ծ୺

85. ৉ೡҗ ੄ઓࢿ ۨѢद दझమ DB ੄ ъੋೠ ࢤݺ۱ • FIG੄ ଼੐਷ ਃҳࢎ೦ਸ ೧Ѿ
 → ۨѢद DB ؘ੉ఠ زӝചח FIG৬ח ߹ѐ • MIRROR ੄ ଼੐ = ۨѢद दझమ ؘ੉ఠ ޖѾࢿ
 → ۨѢद গ೒ۨா੉࣌ ࣗݷ റীب ۨѢद दझమ ਬ૑ • FIG ৬ MIRROR, FIG৬ ۨѢद दझమ р੄ ੄ઓࢿ੉ হ਺ 
 → ਃҳࢎ೦ ҳഅ द ۨѢद दझమ ࣻ੿ ࠺ਊ ծ୺
 नӏ दझమҗ ۨѢद दझమ рী
 ֫਷ ਽૘ب, ծ਷ Ѿ೤ب۽ ੋ૑җࠗച ೧ࣗ
86. 5. ۨѢद दझమ੄ DB ॳӝ ઁѢ
87. DB ഥਗ V1 Module Repo. API API ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ WRITE Event PUB MQ WRITE Mirror SUB WRITE
88. WIRTE ઁѢܳ ৵ ݃૑݄ী ೞաਃ??
89. ੼૓੸ੋ ѐࢶ ਤ೷ ઴੉ӝ • Real-Time җ Near Real Time ਷ ׮ܴ • উ੿੸ੋ MIRROR ܳ ҳࢿೞӝө૑ दр੉ ೙ਃ
 → ࠛഛपࢿ ೧ࣗ • ؘ੉ఠ ਬप = ੢গ
90. 6. ۨѢद दझమীࢲ੄ 
 ୶о ਃҳࢎ೦ ҳഅ ੹ۚ (߹଼ࠗ۾)
91. A ࠄࠗ B౱ ѐߊ੗ C ҵ “ੌ੿ ٸޙী ӝઓ ௿ۄ੉঱౟ ੹ജਸ ޅೞѷחؘ, 
 ӝઓ APIী ӝദ ਃѤٜ ୶о೧઱दѷযਃ?”
92. DB ഥਗ V1 Module Repo. API ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ WRITE Event PUB MQ WRITE Mirror SUB WRITE Client V1 Client V1 WRITE Adapt WRITE Client V2
93. DB ഥਗ V1 Module Repo. API ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ WRITE Event PUB MQ WRITE Mirror SUB WRITE Client V1 Client V1 WRITE Adapt WRITE Client V2 ਃҳࢎ೦ ೧Ѿ਷ FIG ীࢲ!!
94. D ࠄࠗ E౱ ѐߊ੗ F ҵ “੉ߣী नӏ۽ ୶оػ ؘ੉ఠ োز੉ ೙ਃ೧઎חؘ 
 ӝઓ DBী ప੉࠶җ ೙٘ ୶оо оמೡөਃ?”
95. DB ഥਗ V1 Module Repo. API API ۨѢद গ೒ா੉࣌ ഥਗ V2 Module Repo. API FIG গ೒ா੉࣌ DB WRITE Event PUB MQ WRITE Mirror SUB
96. 7. ߈ࠂ, ߈ࠂ, ߈ࠂ …ృ.ź.Ƅ.ೞ.Ů.ŭ..
98. ಿ૕җ Տӝ
100. ਋ܻח ѐߊ౱ਵ۽ࢲ ࢲ࠺झ ࢿ੢ী ֫਷ ಿ૕੄ ࣗ೐౟ਝয৬ ѐߊҗ੿ਵ۽ 
 ӝৈೞח Ѫਸ ઺ਃೠ ଼੐ਵ۽ ৈӤפ׮.
101. ਋ܻח গ೒ܻா੉࣌җ ѐߊҗ੿੄ 
 ಿ૕ ѐࢶ݅ਸ ݾ੸ਵ۽ प೯ೞ૑ ঋਵݴ 
 ਃҳࢎ೦ ӝמ ҳഅ җ੿ীࢲ ೣԋ ѐࢶೞب۾ ೤פ׮.
102. ਋ܻח গ೒ܻா੉࣌җ ѐߊҗ੿ ಿ૕ਸ 
 ѐࢶೞחؘ ೙ਃೠ ӝࣿҗ ੗ਗ਷ 
 ౱ ৉۝ উীࢲࠗఠ प೯೤פ׮.
103. ૑ࣘоמೠ ֢۱ ֫਷ ಿ૕ী ؀ೠ ଼੐җ Տӝ
104. The Feynman Problem-Solving Algorithm 1. write down the problem 2. think very hard 3. write down the answer. 4. repeat... repeat... repeat...
105. ੉ઁ թ਷ Ѥ?
108. PL;CO, दפযо ઱פযܳ Ҋࢤदః ੹ী ೞח ݈ “ѐߊ੗ח ޖ঱оܳ ٜ݅ٸ ࠁ׮ 
 ޖ঱оܳ Ҋசٸ ࢿ੢೤פ׮.”
110. Coming Soon!! 2ࠗܳ ӝ؀೧઱ࣁਃ
111. ઓ ৢझಌ, ࢎ੉౟ न܉ࢿ ূ૑פয݂: ҳӖ੉ ҕѐೞח ࢲ࠺झ ѐߊҗ ਍৔ ֢ೞ਋ “ޥо ઁ؀۽ ૓೯੉ ػ׮ח Ѫ਷ ޥо ઁ؀۽ ૓೯੉ غ૑ ঋח ৬઺ী ߊࢤೞח ౠ߹ೠ ҃਋ੌ ࡺ੉׮.”