Should That Be a Microservice ?
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The document discusses the transition between microservices and monoliths, emphasizing the motivations, heuristics, and implementation strategies involved. Key concepts include technical and business heuristics, Wardley maps, and modular monoliths as a viable approach for certain applications. It highlights the importance of understanding domain boundaries and team structures to effectively navigate the complexities of cloud-native architectures.
Should That Be a Microservice ?
- 1. Confidential │ © 2020 VMware, Inc. Should That Be a Microservice ? From Microservices to Monoliths Rohit Kelapure @rkela Solution Architect at VMware #micro2mono May 2020 [email protected]
- 2. Confidential │ © 2020 VMware, Inc. Agenda 2 Motivation Why? What? How? Technical Heuristics Cloud Native Apps Business Heuristics Wardley Maps, Core Domain Patterns Modular Monoliths App Continuum, Service Block & Moduliths Implementation Sociotechnical Architecture
- 3. Confidential │ © 2020 VMware, Inc. Motivation Why? What? How? 3
- 4. Confidential │ © 2020 VMware, Inc. 4 Microservices has now become DEFAULT Cloud Native and Serverless have become buzz words Towards A New Serverless World https://www.swiftbird.us/post/towards-a-new-ser verless-world Education & Enablement Should That Be A Microservices Workshop Modular Monoliths / App Continuum https://www.infoq.com/news/2020/04/microservi ces-back-again/ Microservices Sprawl - Leads to POOR Development & Testing experience Poor definition and understanding of service & Context Boundaries Challenges with Observability and Heisenbugs To Microservices and Back Again Why Go Back to a Monolith ? HOW? WHY ? WHAT?
- 5. 5Confidential │ © 2020 VMware, Inc. Technical Heuristics Should that be a Microservice? Keep These Factors in Mind Please Microservice Responsibly
- 6. Confidential │ © 2020 VMware, Inc. 6 Technical Heuristics Multiple Rates Of Change Value Streams Independent Life Cycles Speed Matters Independent Scalability Efficiently allocate
- 7. Confidential │ © 2020 VMware, Inc. 7 Technical Heuristics Simplify Interactions with External Dependencies Facades, ACL Isolated Failure Failure Domains Freedom to Choose the Right Tech Polyglot
- 8. Confidential │ © 2020 VMware, Inc. 8 Microservices - Is the Price Right Workshop ?
- 9. Confidential │ © 2020 VMware, Inc. 9 Theory of Microservices Domain Driven Design Subdomains Represents a single, logical Domain Model used to break up the business model logically to understand the problem space. Bounded Context : Language based semantic contextual boundary where each component of the software model has a specific meaning and does specific things. Ubiquitous language: The consistent language spoken by all members of the team within the Bounded Context. It is necessary to rigorous, stringent, exact and tight. Entities: Something with continuity and identity. Aggregates: Mark the scope within which invariants have to be maintained stored. An Order Aggregate would represent the Order, Order Items, Shipping Address, etc. as a single transactional invariant.
- 10. Confidential │ © 2020 VMware, Inc. 10 Are Your Bourndaries (BOUNDED CONTEXTS) Correct ?
- 11. 11Confidential │ © 2020 VMware, Inc. Business Heuristics Wardley Maps To The Rescue
- 12. Confidential │ © 2020 VMware, Inc. 12 Core Domain -An area of the domain with the opportunity for high business differentiation. This represents a compelling ROI. Implementation must has at-least a reasonable level of model complexity. Supporting Domains are business necessities, they contain business concepts related to the domain, but there is limited ROI. Generic Domains represent concepts not-unique to our domain, such as user identity, sending emails, taking payments — we should consider buying SaaS or using open source instead of building Generic Domains. Business Heuristics Context Distillation Invented by Nick Tune @ntcoding
- 13. Confidential │ © 2020 VMware, Inc. 13 Where is my Core Domain ?
- 14. Confidential │ © 2020 VMware, Inc. 14 Understand the Business Capability Value Chain Of Your Product Identify Patterns of Genesis, Product, Utility and Commodity
- 15. Confidential │ © 2020 VMware, Inc. 15 What are Wardley Maps? Using Miro for Wardley Mapping Wardley Maps
- 16. 16Confidential │ © 2020 VMware, Inc. Simon Brown “If you can't build a monolith, what makes you think microservices are the answer?” http://www.codingthearchitecture.com /2014/07/06/distributed_big_balls_of_m ud.html Martin Fowler - Monoliths First
- 17. Confidential │ © 2020 VMware, Inc. 17 Sometimes The Right Answer is a Modular Monolith
- 18. Confidential │ © 2020 VMware, Inc. 18
- 19. Confidential │ © 2020 VMware, Inc. 19 Moduliths: A playground to build technology supporting the development of modular monolithic (modulithic) Java applications. Repo Service blocks are cloud-native applications that share many characteristics with microservices. The key difference with microservices is that a service block is a self-contained system that has multiple independently deployable units—mixing together serverless functions with containers. App Continuum: Evolution of a distributed system starting from a single application and evolving into several applications and services. Link Options - Idiomatic Approaches to Modular Monoliths Moduliths , Service Blocks & App Continuum
- 20. 20Confidential │ © 2020 VMware, Inc. Implementation Sociotechnical Architecture
- 21. Confidential │ © 2020 VMware, Inc. 21 Team Topologies - Flow Based Teams Interaction Modes for the Four Fundamental Team Topologies - Skelton & Pais
- 22. Confidential │ © 2020 VMware, Inc. 22 Coupled - End To End Stream Teams Drawbacks: ● Teams must understand how to operate in multiple domains ● Teams can’t confidently make changes to shared codebases without committee approval ● Cross-functional apps don’t have clear owners to improve them ● Adding a new team requires everyone to take on additional context (the full ecosystem of domains) Teams Are Too Coupled During Development
- 23. Confidential │ © 2020 VMware, Inc. 23 Component Based Teams Improving Team Independence Impact: ● Teams can confidently make changes to and release! code they own at any time ● Cross-functional apps have owners to drive improvements ● There’s a clear path to scaling teams horizontally without drastic scope change for existing teams ● Communication between teams happens between well-defined public contracts instead of in-the-weeds implementation detail
- 24. 24Confidential │ © 2020 VMware, Inc. Conclusion What Next ?
- 25. Confidential │ © 2020 VMware, Inc. Technical + Business + Social Heuristics Bringing It All Together 25
- 26. Confidential │ © 2020 VMware, Inc. 26 Reach out [email protected] Free Discovery Workshop Consult Solve Your Toughest Challenge VMware Pivotal Labs Consultation | VMware Tanzu https://tanzu.vmware.co m/product-consultation
- 27. Thank You Confidential │ © 2020 VMware, Inc.
- 28. Confidential │ © 2020 VMware, Inc. 28