Easy Learn
A complete, beginner-friendly chronicle of the Saga pattern — how independent microservices keep a long, multi-step business promise together and gracefully undo it when one chapter of the story goes wrong. Starts with the wedding-planning analogy, then traces the pattern from its 1987 origin in the Garcia-Molina and Salem paper…
A first-principles, beginner-friendly guide to why traditional ACID transactions and the Two-Phase Commit protocol do not survive the jump from a single monolithic database to many independent microservice databases — and exactly how modern systems stay consistent using the Saga pattern (choreography and orchestration), the Outbox pattern, idempotency, and eventual…
A complete, book-quality guide to the Strangler Fig Pattern for legacy modernisation — coined by Martin Fowler in 2004 and now the de-facto way to migrate a monolith to microservices without a risky big-bang rewrite. Nineteen chapters cover history, motivation, core vocabulary (legacy system, facade, seam, anti-corruption layer), architecture, the…
A complete, beginner-friendly guide to service discovery — how hundreds of moving, restarting, scaling microservices find each other without anyone hand-writing an address book. Traces history from 1990s hardcoded IPs through AWS, the microservices boom, Netflix Eureka, HashiCorp Consul, Kubernetes DNS-based discovery, and the modern service-mesh era. Covers vocabulary, architecture,…
A complete, beginner-friendly guide to compensating transactions — the technique that lets microservices stay consistent when a step fails halfway through, from the 1987 Saga paper to modern orchestrators like AWS Step Functions, Temporal, Camunda, and Azure Durable Functions. Opens with the broken-toy order analogy (money taken, delivery slot booked,…
A complete, beginner-friendly guide to inter-service communication — the set of techniques, protocols, and patterns that let independently deployed microservices work together as one coherent application. Opens with the school-staff analogy (class teacher, librarian, canteen worker, sports coach, principal — none of whom can do everything alone) and the restaurant-kitchen…
A complete, beginner-to-production guide to the API Gateway pattern — the single, well-guarded front door that sits between the outside world and the many small services that make up a modern application. Starts with a plain-English office-building analogy: without a gateway, every visitor (mobile app, browser, partner) would have to…
A complete, beginner-friendly guide to service discovery — the quiet-but-essential mechanism that lets hundreds of moving, constantly-changing microservices find each other reliably. Opens with the “school with 500 students being moved to different classrooms every day” analogy, then traces the history from 1970s-1990s monolithic mainframes where addresses were fixed at…
A complete, beginner-to-production guide to synchronous communication between services — the “phone-call” style of software interaction where the caller sends a request and waits (blocks, logically or literally) for the response before continuing. Opens with the two-friends-on-a-phone-call analogy to anchor the concept, then traces the history from 1970s-1980s mainframes through…
A complete, beginner-to-production tutorial on asynchronous communication between services — the “drop a letter in the mailbox and walk away” alternative to synchronous phone-call-style RPC. Opens with the phone-call vs. mailbox analogy that anchors the entire post, then traces the history from 1960s mainframes through the split into distributed systems,…