A Gentle Introduction to CQRS

Contemporary software systems are increasingly having to deal with "concurrency" and "scalability". There are various reasons why parallelism is a common contemporary approach but it's complex and there are many patterns & practices that aid with complexity. CQRS builds on those patterns & practices to make concurrency and scalability easier, if you let it. We will discuss the basic principles around CQRS & its roots. We'll discuss where CQRS fits, what types of complexities CQRS will help deal with, & when CQRS might not be a good fit. Some in-the-trenches-type lessons learned and temper the principles with some recommended practices will also be covered. As well, some of the reasons why you'd want to have a CQRS frame-of-mind along with some ways to think CQRS with existing systems without rewriting your whole system. CQRS and its related practices & principles are one of areas of software development that really parallels journeyman/master in the level of detail and skill required for it to be mastered.