The concept of "horizontal scaling" is another important principle in microservices architecture. It refers to the idea that instead of scaling vertically (adding more resources to a single server), services should scale horizontally (adding more service instances on different servers or machines).
Horizontal scaling is possible because the services are independent of each other and communicate via the network. This means that you can deploy multiple instances of a service on different machines or servers and use a load balancer to distribute traffic between them.
Horizontal scaling has several advantages over vertical scaling. First, it is more flexible and scalable, allowing services to scale to meet system demand in a more granular and efficient way. Second, it is more resilient, as if one service instance fails, the other instances will continue to function normally. Finally, it allows the system to be deployed in the cloud, which offers elastic scalability and reduces infrastructure costs.
However, horizontal scaling also presents some challenges, such as the need to manage multiple service instances and ensure that the communication between them is secure and reliable. It is important to implement good management and monitoring practices to ensure the availability and performance of the system as a whole.
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