When the system starts to "stuck": an easy transition from monolith to microservices

Picture this: You have an old machine in your warehouse that once worked fine, but now adding new features is like shoehorning something into an already overflowing cabinet—it either gets stuck or is painfully slow. This is the daily life of many teams when faced with the "monolith architecture": more and more code piles up, affecting the whole body, and every update is like walking on a tightrope.

But here comes the question: How to safely dismantle this behemoth without affecting the normal operation of the business? Is there a way to turn a large system into flexible, independent small modules like dismantling Lego? This sounds complicated, but the idea behind it is actually quite natural.

Why are microservices better suited to today’s needs?

In the past, a system was often packaged as a whole. The advantage is simplicity, but the disadvantages are also obvious: if you change a little, you have to redeploy everything, the scalability is poor, and the technology stack is locked. But now, business changes rapidly, and teams need to develop and deploy independently - microservices are to break down a large system into a series of small services, each of which can be run independently and upgraded independently.

For example, an e-commerce system can be broken down into user management, order processing, inventory inquiry and other services. If there is a problem with a certain service, it will not bring down the entire system; if you want to upgrade the payment module, there is no need to touch the user login part. This structure is like changing from a large host to a combination of multiple small devices, which is much more flexible.

Relocation is not about demolishing the house, but re-planning the space

It is too risky to directly tear down and start over, so mature migrations often adopt a gradual model. For example, the "Stranger Mode": gradually build new services on the periphery of the original system, slowly transfer traffic to the new services, and then remove the old functions when they are no longer used. It's like adding new rooms to an old house and then considering renovating the old parts once the new areas are ready for use.

Or use "branch mode": copy part of the function to the new service, run it in parallel for a period of time, and then switch after verifying that it is stable. Either way, the core is to reduce risk and make the transition smooth.

But which mode is more appropriate?

It depends on the specific situation. If the system is highly coupled, it may be suitable to migrate from edge functions; if some modules are already relatively independent, it may be possible to divest them directly. The key is not to pursue a perfect solution, but to find the safest path at the moment.

During the process, the team needs to pay attention to how to draw service boundaries, how to synchronize data, and how to manage communication. These details determine whether the migration is smooth. Just like when renovating, water and electricity pipelines must be planned in advance, otherwise there will be constant trouble after moving in.

kpowerPractice: Making Technology Migration Predictable

existkpower, we have experienced many such projects. We found that successful migration is often inseparable from several foundations: clear module division, automated deployment tools, and continuous monitoring. This was not accomplished overnight, but was the result of step-by-step iteration.

For example, one customer used to use a huge system to handle all business. Each update had to coordinate multiple teams, and the deployment window was getting longer and longer. Through gradual splitting, they turned order processing and logistics tracking into independent services. Now these two modules can be expanded on demand, and the development pace is much faster.

How is the world different after migration?

The most direct feeling is: changes become safer and faster. Teams can focus on their own services without always worrying about affecting others. System flexibility has also been enhanced - a service under heavy pressure can be expanded independently without the need for an overall upgrade.

In the long run, this architecture allows more freedom in technology selection. Different services can use different languages ​​or frameworks, whichever suits them best. It's like going from being able to only buy sets to being able to match your own items, the flexibility is completely different.

Of course, microservices are not a silver bullet. It will bring new challenges, such as the complexity of distributed systems and network latency issues. But these are often more controllable than the rigidity of monolithic structures.

So, when should you consider migrating?

When you find that the system is becoming more and more difficult to modify, deployment risks are high, and team collaboration is frequently hindered, it may be time to look at microservices. It may not be suitable for all scenarios, but for medium and large systems that require rapid iteration and multi-team collaboration, this architecture can often open up new situations.

The process of relocation is a bit like gardening: you can't uproot a plant and replant it, but you have to be patient with pruning, dividing, and transplanting. The focus is not on speed, but on taking every step steadily.

existkpower, we believe that a good technology migration should be like a smooth journey - with a clear map and preparation for the unexpected. The goal is not to pursue a fashionable architecture, but to make the system truly support the business further.

If you are also facing the "growing pains" of the system, you might as well think about: Which parts can be more independent? What changes could make it more secure? The answer may gradually become clear by trying small steps again and again.

Established in 2005, Kpower has been dedicated to a professional compact motion unit manufacturer, headquartered in Dongguan, Guangdong Province, China. Leveraging innovations in modular drive technology, Kpower integrates 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.