Easy Learn
A complete, plain-language field manual covering all 22 sections of the transactional outbox pattern — the standard microservices building block that stops services from silently losing events. Explains the dual-write problem in depth (four canonical failure modes: DB-ok/broker-fail, broker-ok/DB-fail, crash-in-between, broker-down), why every naive workaround fails (publish-first, application retry, 2PC/XA,…
A complete, beginner-friendly field manual covering all 18 chapters of why observability is a survival skill in microservices architectures. Explains the shift from monoliths (one place to look) to microservices (needle in a haystack of needles), the “detective problem” of debugging 30 services with scattered logs and no correlation IDs,…
A complete, beginner-to-production tutorial on distributed tracing — the observability discipline that follows one single request as it hops across dozens of independently deployed microservices, so engineers can pinpoint the exact slow or failing step in seconds instead of hours. Opens with the online-pizza-order analogy and the relay-race-across-cities-with-a-GPS-baton analogy to…
A single button tap can quietly trigger dozens of network calls behind the scenes. This complete field manual on the fan-out problem in microservices covers all 18 chapters end-to-end: what fan-out and fan-in are, why the term comes from electronics, the request-amplification factor, synchronous vs asynchronous fan-out, cascading failure, backpressure,…
A complete, beginner-to-production tutorial on chaos engineering — the discipline of deliberately injecting real-world failures (killing servers, adding network latency, dropping packets, exhausting CPU or memory, simulating an entire cloud region outage) into a running system on purpose, in a controlled way, during working hours with engineers watching, to discover…
A complete, beginner-friendly field manual for the Bulkhead Pattern — the resilience design pattern that isolates a system’s resources (threads, connections, permits) into separate pools per dependency, so one slow or failing dependency can never exhaust capacity needed by unrelated healthy parts of the same system. Starts with the ship…
A complete, ground-up field guide to backward compatibility in API design — the discipline of changing your API’s “menu” so that clients holding the old menu (a 2019 mobile app, a partner integration untouched for five years, a farmer’s SMS alert system) keep ordering successfully even after you have quietly…
A beginner-to-production field guide to the real, first-time challenges of moving from a monolith to microservices. Starts with the toy-factory analogy and a decades-long honest history (1990s monoliths → early-2000s SOA/ESB → 2011 Venice workshop where the term is coined → 2014 Fowler/Lewis article → Docker/Kubernetes wave → service mesh…
A complete, beginner-to-production tutorial on the correlation ID — a short, unique, opaque string (usually a UUID like 7f3a9e21-4b6d-4c2a-9f11-8e2d5c7a10bb) attached to a request at the moment it enters a system and then propagated unchanged through every service, message queue, database call and log line that touches it, so a single…
A complete, beginner-to-production tutorial on service versioning — the practice of labelling distinct editions of an API or service so that old and new clients can both keep working while the service itself evolves. Opens with the toy-robot-and-remote analogy (an old remote that only knows “walk” is exactly the same…