Some of the advantages of microservices are as follows:
- As each service focuses on one responsibility, the code becomes clearer, easier to test, and has a more controlled flow.
- Services can be independently deployable by an automated deployment process.
- Unlike monolith services, it doesn't suffer from the single point of failure. All the services are deployed separately and talk to different data stores.
- Any change or upgrade can be easier with microservices. Unlike the monolith, making an upgrade won't results in downtime for the system as a whole. Only the required system will be upgraded.
- We can have smaller code bases with the microservices, and maintaining such code bases becomes easier.
- When it comes to scalability, the service that is getting more requests can be scaled easily, leading to better resource utilization and better system performance.
The microservices style of architecture may not be employed for every use case. Although it offers several advantages, it also has some side-effects. If the number of smaller services increases, deploying and managing can be overhead sometimes. Communication between services might contribute to the latency.