What is the high availability principle of Eureka?

The high availability principle of Eureka is achieved by forming a cluster of multiple Eureka servers. Each Eureka server is a interconnected node that registers and replicates service information among each other.

When a service starts, it registers its information with one of the Eureka servers. This Eureka server then replicates the service’s information to all other Eureka servers. This ensures that even if one Eureka server fails, the information about the service is still available on the other servers, allowing other services to discover and access it through other available Eureka servers.

If a Eureka server is unable to accept new registration or replication requests, it will be removed from the cluster by other servers to ensure the stability and availability of the entire cluster. Additionally, Eureka servers detect each other’s health status through a heartbeat mechanism to ensure the health of each server.

In a nutshell, Eureka’s high availability principle involves deploying multiple Eureka servers in a clustered environment, and ensuring the consistency and availability of service registration information through replication and heartbeat mechanisms.