In order to guarantee the system's reliability, we cannot allow a situation where each service would have only one instance running. We usually aim to have a minimum of two running instances in case one of them experiences a failure. Of course, there could be more, but we'll keep it low for performance reasons. Anyway, multiple instances of the same service make it necessary to use load balancing for incoming requests. Firstly, the load balancer is usually built into an API gateway. This load balancer should get the list of registered instances from the discovery server. If there is no reason not to, then we usually use a round-robin rule that balances incoming traffic 50/50 between all running instances. The ...
Communication between services
Get Mastering Spring Cloud now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
