When your system starts to “complain”: A real conversation between monolith and microservices

Picture this: you have a big thing, a machine, and all the parts are welded together. It runs vigorously and with great momentum. But one day, a small gear got stuck - and the whole machine had to stop. You rolled up your sleeves and worked hard for a long time, sweating profusely. You might have just fixed a small problem, but it delayed everything.

This is like a "monolith" in software architecture. Putting all the functions into a huge system, it is simple and straightforward at the beginning, and it runs quickly. But as the business grew, problems quietly came to the door.

What are microservices?

You can think of it like a collaborative band. Each musician is responsible for his or her own part - the drummer plays the rhythm, the guitar plays the melody, and the lead singer focuses on the vocals. They practice individually and work together perfectly when needed. Even if the guitar string suddenly breaks, the drums and keyboards can continue to practice while the strings are being changed, so that everyone will not stop working.

In the digital world, microservices mean breaking a large application into a series of small services. Each service is built around a specific business capability, manages its own data, and communicates through lightweight mechanisms. It allows you to update, extend or fix a part individually without disturbing the entire system.

Why do some people waver between the two?

"It saves a lot of trouble to use a single entity at the beginning," you may think, "all the code is together, and development and debugging are clear at a glance." Indeed, when early projects pursue speed, this is a pragmatic choice. Deployment is simple and testing is centralized. But when the number of users increased tenfold and functional modules continued to increase, this "worry-free" began to change.

The once neat code base gradually turned into a tangled mess of headphone cables. Adding a new feature may accidentally break three old features. Want to use a new technology framework? The entire system may have to be rewritten. As the team grows larger, dozens of people are crowded into the same code repository, and submission conflicts become a daily occurrence.

At this time, the advantages of microservices really emerge. It allows different teams to focus on different services and use the most suitable technology stack. Does a service need more resources to handle traffic spikes? You can scale it individually without buying ten more servers for the entire system. Want to try a new database? Experiment in a small service, and the risks are controllable.

But are microservices the panacea?

Not really. It brings a new level of complexity. With more services, network communication becomes key. The function call that was originally within a process became a request across the network. You need to consider latency, fault tolerance, and data consistency. Monitoring and debugging have also become different - the problem may occur in any link, and tracking it is like a detective solving a case.

There are also deployment challenges. Dozens of services, each with its own release cadence. How to coordinate? How do you ensure they are compatible with each other? This requires a set of automated deployment pipelines and a mature operation and maintenance culture, which not every team is ready from the beginning.

So you see, it's not a simple "which is better" question. More like asking: Where are you now? What is your team size, technical reserve, and business stability? It's like choosing a motor for a mechanical system - you don't always choose the one with the highest power, but the one that best matches the current load and future growth expectations.

Find your balance

The typical path taken by many teams is to start with a single entity and quickly validate ideas. When the system becomes so complex that it starts to slow down the iteration speed, key services will be gradually removed and moved toward a hybrid architecture. Finally, use microservices in parts that really need to be expanded and deployed independently; maintain moderate aggregation in parts that are closely related and change in sync.

In this process, the choice of tools and concepts is crucial. You need clear definition of service boundaries, reliable communication guarantee, and visual monitoring methods. This is not an overnight switch, but a continuous evolution as the business grows.

At this point, you may think of the project you have at hand. Has a certain module been changed very frequently recently, while other parts are relatively stable? Are you nervous every time you release something, fearing that it will affect irrelevant functions? These subtle feelings are often early signals that the architecture needs adjustment.

Technology decisions are rarely black and white. It is more like finding the optimal path within various constraints - time, resources, team capabilities, business goals. Monoliths and microservices are essentially tools that serve these goals. Only by understanding their temperament can you know which wrench to use when.

When you can use these two modes flexibly, your system will be like a finely tuned machine - the parts that should be stable will be integrated, and the parts that should be flexible will be independent and agile. That feeling of freedom of movement is perhaps the most tangible sense of accomplishment in architectural design.

kpowerWe continue to work hard in the field of motion control and are committed to providing stable and reliable power support for complex systems. We believe that appropriate technical architecture, like high-quality hardware, is the cornerstone of the long-term healthy operation of the system.

Established in 2005,kpowerhas been dedicated to a professional compact motion unit manufacturer, headquartered in Dongguan, Guangdong Province, China. Leveraging innovations in modular drive technology,kpowerintegrates high-performance motors, precision reducers, and multi-protocol control systems to provide efficient and customized smart drive system solutions. Kpower has delivered professional drive system solutions to over 500 enterprise clients globally with products covering various fields such as Smart Home Systems, Automatic Electronics, Robotics, Precision Agriculture, Drones, and Industrial Automation.