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Microservices
- 2. 2 Contents 1 ???????? ?? 0 Warm-up 3 ??????? ?? ?? ? ??? 4 ???????? ?? ? ?? 2 ???????? ?? 5 ??????? ?? ?? ? ??? 6 MSA ??
- 3. 3 Infrastructure Evolution ? IT ???????? ?? Electronic accounting machine 1930 ~ 1950 ? ??? ??? ?? ?? ??? ??? ?? ? ?? ???? ????? General-Purpose Mainframe and minicomputer 1950 ~ ?? ? 1958: IBM ????? ? 1965: DEC ??? Personal computer 1981 ~ ?? ? 1981: IBM PC ? 80~90?? PC ? SW ?? Client Server 1983 ~ ?? ? ??? ?????? ????? ?? ?? ?? ? N-tier ? ??? ??? ??: ????, ??????, Web Enterprise Internet 1992 ~ ?? ? ?? ???? ? ??? ?? ? ?????? ?????? Cloud and mobile computing 2000 ~ ?? ? ??? ? ??????? ????? ????? ?? ?? ? ?? ??? ???? ??? ??
- 4. 4 Software Development Methodology ? Waterfall ? Agile ? DevOps Waterfall Agile DevOps Analysis Development Build Test Deployment DEV QA OPS Test Deployment DEV QA OPS A D B A D B A D B Sprint Sprint Sprint A D B T D Sprint DEV/QA/OPS A D B T D Sprint DEV/QA/OPS A D B T D Sprint DEV/QA/OPS
- 5. 5 Prolog - History Innovation 1985 1995 2005 2015 2025 OO application (offline, monolith) Online systems (offline, monolith) Distributed systems (distributed monolith) Microservices Technology X Challenge: Reaching customers (diskettes, CDs) Challenge: Scaling Performance Challenge: Zero downtime Upgrade Challenge: Comprehension Monolith Single unit SOQ Coarse-grained Microservices Fine-grained
- 6. 6 Prolog - AOP AOP(Aspect Oriented Programming)? ??? ?? ???? ??? ?? ??? ????, ?? ??? ??? ?? ???? ?? ?? ??? ?? ??? ????? ??? ???? ????. ?? ???? ?? ??? ?? ?, ?? ??? ???? ??? ???? ?? ????. OOP AOP ?? ?? ?? ?? ???? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ???? ?? ???? ?? ???? ?? ???? ?? ??? ?? ?? ?? ?? ???? ?? ?? ?? ?? Application Primary Concern Cross-Cutting Concern Application Primary Concern Code Aspect Point-cut Cross-Cutting Concern Advise Primary(Core) Concern: ???? ??? ??? ?? Cross-Cutting Concern: ???? ???? ??? ??? ???? ???? ?? Code: primary Concen?? ??? ?? ?? Join Point: ?? ?? ?? ??? ???? ??? ? ?? ?? ??? ?? ?? Point-Cut: ?? ???? Join Point? ??? ??? ???? ?? ?? Advise: ? Join-Point? ???? ??? ? ?? ??
- 7. 7 Prolog - SOA ? Service Oriented Architecture ´ ? ??? ???(Client)? ???? ???? ?????? ?? ?? ? ?? ??? ?? ??(???)? ??? ????? ??? ?? ???? ?? ?????? ????? ???? ???? Service Orientation Architecture ? Open ? ?? ???? ?? ????? ?? ? ?????? ??? Description? ?? ???? Dynamic Discovery ???? ?? ?? ??? ?? ? ???? ??? ???? ?? ????? ???? ??? ? ? Layer? ?? ???? ?????? ?? ????? Blueprint? ????? ?? ? ??, ????, ?? ??? ?? Service Consumer Service Provider Service Broker Find Register Bind Message Client Service Service Contract ?? ???? ?????? ?? ???? ??? ???? XML ??? ? ????, Service Broker? ?? ???? ???? ????, ??????? ???? ???? ?? ? ?? ??? ????.
- 8. 8 Prolog - Service ? ??? ? ????? ??? ??? ??? ??? ????? ??? ? ?? SW ???? ? ??? ???, ?? ?? ? ??, Self-contained ? ???? ??? ?? ??? ??? ???, ??? ?????? ???? ?? ????? ??? ??? ????? ???? Service Implementation ? ?? ??? ?? Service Interface ? Request? ???? ? ??? ?? Infrastructure Service Existing Application External Services Existing Application Service Wrapper Service Wrapper Coarse Grained Business Service (Business Service Bus) Aggregation Fine Grained Implementation-Based Service ???
- 10. 10 Monolithic Architecture vs. MSA
- 11. 11 Microservices - Definition ? Microservices is ´ A software architecture style in which complex applications are composed of small, Independent process communicating with each other using language-agnostic APIs. These services are small, highly decupled and focus on doing a small task, facilitating a modular approach to system-build - Wikipedia ??? ??? ????? ?? ???? ??? ?? ??? ??????? ???? ????, ??? ???? ???? ???? ????, ??? ??? ? ??/????? ?? ?? ????? ??? ? ??. ???? ???? ?? ??? ???, ? ???? ?? ?? ????? ??, ?? ??? ???? ??? ??? ??? ?. - Martin Fowler at ThoughWorks Data Store Public API Software Modules: Application code, libraries, ´ Microservices = Fine-grained service-oriented architecture + ＾small￣ public API Microservice
- 12. 12 Microservices C Pros, & Cons. Data Business Logic Web Monolithic Design Microservices Design Http Listener Page Content ReportingOrder ManagementUsage Analytics AuthenticationOrderSearching Monolithic Style Microservices Single Unit with all components interwoven Applications are suite of service Overall Scaling of the structure required Each service independently scalable Overall deployment Independently deployable Increases complexity for developers More developer friendly One errant component crashes the whole system Fault diagnosis and isolation is easier Testing is streamlined Difficult to test
- 13. 13 Microservices - Size ? ???????? ??? ??? ?? ??? ???????? ???? ?? ? ? ?? (?? ??) ??? ?? ??? ????? ??? ??????? ?? ?? ???????? ?? ?? ??? ??? ?? ???? ??? ??? ????? ???? ?????? ?? ? ? ??? ?? ???? ???? ???? ??? ???? ??? ?? ?? ???? ???????? ??? ????? ????? ???? ??? ?????????? ???? ??? ??? ??? ?? ??, ???????? ??? ???? ???????? ???? ?? ??? ????
- 14. 14 Microservices C Organization: Conway¨s law Organizations which design system (in the board sense used here) are constrained to produce design which are copies of the communications structures of these organizations - Melvin Conway, Datamation, 1968
- 15. 15 Microservices C Most Important thing! ? Only rely on each other¨s public API ? ?? ?? ??? ?????? ?? ???? ???? ??? ???? ? ??? ??? ?????? ?? ?? ???? ? ?? ??? ?????? ?? ?? ???? ??? ????? ????? ?? Microservice A Microservice B
- 16. 16 ???????? ??
- 17. 17 MSA ? Microservices Architecture ? ???? ???? ?? ??? ?? ????? ??? ?? ? Inner Architecture C ?? ???????? ???? ? Outer Architecture C ???????? ??? ???? ???? ??? ?? ??? ?? Inner Architecture Outer Architecture ? Single Purpose ? Loosely coupled ? Independently deployable ? Independently disposable ? Focused Business Capabilities ? Decentralized Data Management ? Heterogeneous Technology ? Logging & Monitoring ? Stateless ? Managed APIs ? Expose services ? Route messages ? Asynchronous communication ? Load Balancing ? Service Discovery ? Shared Configuration ? Dependency management ? Transaction Analysis ? Logging & Monitoring
- 18. 18 Microservices - Implementation ? MSA ?? ? ????? ??? ?? 4??? ?? ???? ??? ?????? ?? ??? ??? ?? ??????? ??? ??? ?? ???? ?? ? ??1 2 3 4 ??? ???? ? ?? ?? ??? ??? ? ???? ??? ??? ?? ??? ??, ??? ? ?? ?????? ?? ?? ?? ??? ??????, ????? ? ?? ????? ??? = Σ ??? ???? ??? ?? ??? ???? ?? ? ???? ?? ??? ?? ? ???? VM?? ?? ? ???? ?????? ?? ? API Gateway - ???/???? I/O ? IPC - ??(??? ??) - ???(Request) ? Client Side Discovery Pattern ? Server Side Discovery Pattern - ?? ???? ?? ??? ???? ?? ????? ????, ?????? IP? ?? Service Discovery ?? ???? ?? ??
- 19. 19
- 20. 20 ??????? ?? ?? ? ???
- 21. 21 Microservices - Benefits ? ??????? ?? ? ?? ?? ?? ?? ?? ???? ?? ? ?? ??? ? ?? ??? ?? ? ??? ?? ? ???? ?? ?? ? ??? ? ??? ? ???? ?? ?? ? ??? ? ?? ??? ? ?? ??? ? ??? ???? ? ?? ?? ?? ? ??? ????? ?? ? ??? ???? ??? ???? ?? ???? ?? ???? ??????? ?? ???? ??? App ?? ????? ?? ??? ?? ?? ??? ?? ?? ??? ?? ?? ??? ?? ??? ??? ?? ?????
- 22. 22 Microservices C Challenges ? ??????? ?? ? ???? ???? ??? ??? ?? ?? ?? API? ?? ?? ? ?? ?? ??? ?? ? ?? ?? ??? ? ??? ?? ?? ? ?? ?? ???? ???? ?? ??? ??
- 23. 23 ???????? ?? ? ??
- 25. 25 API Gateway ? API Gateway ? ??? ?? ??? ???? ??? ? ?? ??? ???? ??, ??? ? ???? ???? ?? ? API Gateway ?? ?? ? ??? ??? ?? ? API Gateway? ?????, ??, ???? ? ??? ??? ?? ? ?? ? ?? ??? ? ???? ??.
- 26. 26 IPC ? Inter-Process Communication ? ??????? ??? = ?? ??? ? ??? ? ??? ??(1:1, 1:N) ? IPC ?? ? ?? ??/?? ?? : REST, ´ ? ??? ??? ?? : AMQP, ´ ? ??? ?? ? ??? ?? : JSON, XML, ´ ? ???? : Protocol Buffers, ´ 1:1 1:N Synchronous Request/response - Asynchronous Notification Request/async response Publish/subscribe Publish/async response Channel ??? ???? ??
- 27. 27 Service Discovery ? Why ? ? Request? ??? ???? ??? ????? ???? ??? ??? ??? ? ? IP? Port ??? ?? ? ??? ?????? ? ??? ????? ???? ??? ???? ?????? ? ?? ?? ??? ????, ????? ?? ? Netflix Eureka, etcd, Consul, Apache Zookeeper ? ??? ??? Self-Registration Pattern? Third-Party Registration Pattern
- 28. 28 Event Driven ? ?? ??? ? CAP(Consistency, Availability, Partition tolerance)? ???? ?? Two-phase commit protocol Event Sourcing ??? ?? ??? ???? ?? ??? ???? ??? ??? ???? ?? ??? ??? ???? ?? ??? ??? CQRS(Command Query Responsibility Segregation) ??(???? ???? Create/Delete/Update)? ??(???? ???? Read)? ??
- 29. 29 ??????? ?? ?? ? ???
- 30. 30 V-Model & Test Pyramid ? Each phase has corresponding test or validation counterpart Requirements Analysis System Design Program Design Implementation Unit Test Integration Test Acceptance Test Nested V-Model Nested multiple V-Model
- 31. 31 Microservice Deploy ? Use Continuous Integration/Delivery/Deployment ? Decreased lead times and higher quality with smaller batches Monitoring
- 33. 33 MSA ??
- 34. 34 Best Practices #1 ? A? ?? ?? ???? ???? ?? ????? ?? ?? ?? ?? ?? ?? ?? ?? ??????? ???? ?? ????? ??????? ???? ?? ????? ??????? ???? ?? ????? ?? ???? ?? ????? ?? ??? ?? ??? ????.
- 35. 35 Best Practices #2 ? ???? ???(Signal Inc.) ? ??? ??? HW -> ??? ???? ?? ? ?? ?? ??? ?? ?? ? ? ? ?? ??? ?? ? ?? ??? ? ? ? ? ? Processing Processing Processing Sensor Sensor Sensor Sensor
- 37. 37