Bounded context in microservices8/19/2023 ![]() Technology heterogeneity: Developers can theoretically build each service in a different language and with different technologies.For most large organizations this “people side” is one of the main reasons for adopting a microservices approach. This increases accountability, code quality, and job satisfaction. Autonomous teams: Microservices allow small teams to take full ownership of the entire lifecycle of a service.Whether addressing “people problems” by aligning services to teams, speeding up innovation by reducing risk of new tech adoption, or easing deployment and scalability, adopting microservices provides numerous benefits. Now that we know what microservice are, let’s explore why organizations are adopting them. But I’ll cover those in a separate article. This, by the way, is where service meshes fit it. This network and the amount of communication happening over it introduces new challenges. To function as one cohesive app, all these different autonomous services communicate over a network through network interfaces. Data sharing can inadvertently lead to coupling and should therefore always be deliberate. Information hiding: Each microservice only shares data other services need and hides data only relevant to its own processes.For a deeper dive into this topic please see Domain-Driven Design (DDD). By grouping all related behavior together, engineers update code in one place only whenever they want to change a particular behavior. Not only is this more time-consuming, but it also increases risk. Otherwise, each time you want to update the behavior, you have to update different parts within your app, each representing an additional release. You don’t want to spread behavior across the app. High cohesion: Code with related behavior is grouped together.That means it has its own lifecycle and is independently deployed, updated, scaled, and deleted. Loose coupling: Each service is autonomous and only loosely connected to the rest of the system.To support that, microservices have the following properties: What characterizes a microservice? On a high level, all microservices should remain independently deployable - the core design philosophy behind microservices. They also allow individual app teams to focus entirely on a single business process without needing to understand the entire application. Why are they important? To update an application, microservices can be updated and deployed independently - you don’t have to re-deploy the entire application. Generally considered to be an independent part of a codebase, microservices are maintained by a single team. They inherited their basic operating model from SOA but extended it in a more prescriptive way. Microservices are small, autonomous app components that together form an application. That makes microservices the latest culmination of the continuous architectural evolution in search of a decoupled system. ![]() ![]() Independent cloud consultant Sam Newman argues that microservices are nothing more than a modular architecture where the modules run on different processes that communicate via networks. ![]() A microservices-based architecture is a more prescriptive type of SOA that emerged from real-world use cases and has been successfully adopted by numerous organizations. SOA got quite a bit of traction but largely failed, mainly because it left lots of unanswered questions, such as how to correctly split services up. From object-based architectural styles to service-oriented architectures (SOA) to microservices, application architecture became increasingly decoupled (to learn more about software architecture, check out this primer on the topic). Nevertheless, engineers did start modularizing applications. While the former can be addressed by breaking monoliths down into modules (semi-independent components) - an approach that has been around for decades - it never really caught on even though it’s likely much simpler than implementing microservices. To roll out a simple change, you had to re-deploy the entire application and, if something went wrong, everything was impacted, not just the component you wanted to update or scale. With no clear separation between different functionalities, when you update one part of the app, you may inadvertently affect a totally different one. Traditionally, applications were built as monoliths where all code was lumped into one big codebase. Microservices emerged when organizations started to build more complex applications and the practice of writing monolithic apps became increasingly problematic. A marketing leader turned cloud native evangelist, Catherine is passionate about educating business leaders on the new stack and the critical flexibility it provides. Catherine is head of marketing at Buoyant, the creator of Linkerd. ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |