What Are Microservices?
Microservices is an architectural style that structures your application as a collection of small, autonomous, and loosely coupled services. Instead of building a single, massive application (called a monolith), developers can break down the system into these smaller services where each one focuses on a single business capability. For example, an e-commerce microservices application might have a service called “Shopping Cart” and another one called “User Profiles.”
Microservices are massively scalable, resilient, they have a faster time to market, and they allow you to experiment with new technologies and features. You’ll have to mitigate the challenges, which include network latency, data consistency, complexity (like if you have to manage 50 services), and the JVM warm-up time.
What Are Containers?
Containers are standardized, lightweight packages of software that contain everything an application needs to run: the code, the libraries, all the dependency files, and even the specific version of the runtime. Containers are often thought of like those big, metal shipping containers on freight ships. As long as all your goods fit inside one of those standard metal boxes, then any ship, crane, or truck can handle it. You can stack them together on a ship and move them wherever you need them. Software containers do the same thing for your code and files.
You don’t have to worry about whether the software works on your machine, because it brings everything it needs with it. They’re pretty small, so you can fit ten to fifty times more containers on a single server than you could with virtual machines (VMs). Containers are the perfect home for microservices. For example, you could scale your “Login” container independently of your “Payment” container.
Microservices vs. Containers
We should stop thinking of microservices and containers as competitors or even alternatives. Instead, we should understand that microservices are a type of architecture, and containers are a method of packaging code. In modern software, they are often used together, but you can have one without the other.
When Should You Use Containers?
- Use containers whenever you need code to run on any system. Containers can help make sure your development environment is always the same.
- Use containers to save money on servers. Containers are much smaller than virtual machines.
- Use containers when you have complex dependencies. A container locks in a specific version of Java, a specific library, and a specific OS setting, so you don’t need to manually configure multiple servers.
When Should You Use Microservices?
- When you need to scale parts of your app separately.
- When you have many teams, which makes app development complicated, with too many dependencies.
- When you have high fault tolerance, where one feature set can crash another one. Microservices help you isolate your app’s failures.
These situations are not mutually exclusive. In many cases, you’ll want to use microservices to break up your application, along with containers to package your environment.
How Azul Prime Helps with Microservices and Containers
In a containerized world, Java has a major weakness: the warm-up problem. When a containerized Java microservice starts (or scales out), it starts cold. The JVM must interpret code and perform just-in-time (JIT) compilation before it hits its peak speed. This causes latency spikes every time you deploy or scale.
Azul Prime solves this for containerized apps using ReadyNow! It allows the container to remember its previous state and start up at peak performance immediately, which is critical for maintaining high-speed responsiveness in modern, orchestrated environments like Kubernetes.
Azul also uses its Cloud Native Compiler to offload heavy JIT compilation work to a separate service. This keeps your microservice containers small, so they don’t use many CPU resources upon startup.
Azul’s C4 Garbage Collector eliminates the “stop-the-world” pauses that often trigger false-positive failures in container environments.
To learn more about how Azul Prime can provide you with a high-performance JVM, see Azul Prime: High Performance JVM.
