Dev/Architecture

Model: Clue Bucket Clue bucket = toolbox (@ruthmalan) insights patterns best practices design principles proposal: add Design Heuristics (src: Video_ Design Heuristics - Mathias Verraes - KanDDDinsky 2018)

something that has happened in the past that is relevant to the business (src’s src: from summary book Eric Evans (not the blue book) ) (src: Video_ Design Heuristics - Mathias Verraes - KanDDDinsky 2018)

(src: Course_ ADSD - Fallacies of Distributed Computing) role: Business Analist role: Architect role: Project Manager Estimates Given a - well-formed team (worked together) - with required skills (has done such things before) - of size S I like how estimates formulated this way, drive Proof-of-Concepts with the sole focus of getting better estimates. This then lowers risk & variability by shifting that to the beginning of the project....

Search for ’natural folding lines’ in the domain Try to find the “natural folding lines” between areas in the domain. how: ask domain experts: “Can you imagine that changing data x ever impact data y” eg. “[hospital] Would the patient changing family name impact which doctor they get treated by” eg. “[webshop] Would changing the description of a product cause the price to change?” When the domain expert looks at you like - "You don't get it at all do you?...

Course_ Advanced Distributed System Design - Udi Dahan Coupling incoming vs outgoing coupling def: incoming coupling def: outgoing coupling clarity: incoming vs outgoing count coupling X->Y x outboing 1 y incoming 1 A->B x outgoing 5 “is this class single responsibility principle” y incoming 1 “how many classes do I have to change” static analysis tool hidden coupling 3 aspects of coupling ...

Course_ Advanced Distributed System Design - Udi Dahan def: Application def: System application !-> connectivity 8 fallacies of distributed computing latency table backward compatibility is a requirement for CD unless you have multiple versions & backward compatibility, dont do CD CD will become Cdowntime functionally separate vs physically separate you can deploy monolith what is logically decoupled Product vs Project maintenance is a bad metaphor, project is better...

Course: Advanced Distributed System Design - Udi Dahan https://learn.particular.net/courses/adsd-online Important info about the course Welcome to the course Distributed System Design- Slides Fallacies of Distributed Computing Introduction: Systems vs. Applications Fallacy #1: The network is reliable Fallacy #2: Latency isn’t a problem Fallacy #3: Bandwidth isn’t a problem Fallacy #4: The network is secure Fallacy #5: The network topology won’t change Fallacy #6: The admin will know what to do Fallacy #7: Transport cost isn’t a problem Fallacy #8: The network is homogeneous Summary: 8 fallacies of distributed computing Fallacy #9: The system is atomic Fallacy #10 : The system is finished Fallacy #10: Towards a better development process Fallacy #11 : The business logic can and should be centralized [[course-adsd-coupling....

(https://vimeo.com/108441214) Paper_ waterfall - Winston Royce Paper_ Big Ball of Mud - Brian Foote, Joseph Yoder read: alan K Article_ Dr. Alan Kay on the Meaning of Object-Oriented Programming https://en.wikipedia.org/wiki/Alan_Kay read: Carl Huwitt https://en.wikipedia.org/wiki/Carl_Hewitt -> learn erlang to learn paradigm for better OO Video: The art of destroying software - Greg Young Greg Young - The art of destroying software Paper_ waterfall - Winston Royce You should read the original waterfall pater....

Microservices at Netflix Scale: Principles, Tradeoffs & Lessons Learned - R. Meshenberg https://www.youtube.com/watch?v=57UK46qfBLY Principles Principles in action stateless services register to service discopvery health check get external stuff from service discovery -> test it in prod billing services (needs to be just right) limited access auditable === COST Need for microservices Contract for intermediate language (IPC) protect your dbs operational visibility is it scalable? get signal out of noise !...