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I'm giving a try to Spring Cloud and Spring Boot. It uses Netflix OSS Applications, among them there are Ribbon and Hystrix.
Ribbon is a load balancer and comes with some features, one of them is a circuit breaker.
Hystrix is a circuit breaker application.
I don't know the difference between them both. Why use Hystrix if Ribbon already comes with a circuit breaker feature.
Can I use both applications in the same connector?
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Circuit Breaker pattern prevents failure cascading and gives a default behavior when services fail. Netflix Hystrix allows us to introduce fault tolerance and latency tolerance by isolating failure and by preventing them from cascading into the other part of the system building a more robust distributed application.
The most prominent difference between the two is the fact that while Hystrix embraces an Object-Oriented design where calls to external systems have to be wrapped in a HystrixCommand offering multiple functionalities, Resilience4J relies on function composition to let you stack the specific decorators you need.
Hystrix fallback prevents cascading failures. Having an open circuit stops cascading failures and allows overwhelmed or failing services time to recover. The fallback can be another Hystrix protected call, static data, or a sensible empty value.
Regarding Zuul, there is a RibbonRoutingFilter that routes your request to an actual service instance. RibbonRoutingFilter is using Ribbon to choose a server from the list that is given from your configuration or from Eureka. So if you want to use Zuul as a load-balanced reverse proxy, Zuul needs Ribbon.
I'm not aware of any circuit breaker in ribbon except integration with Hystrix. We recommend using both, ribbon for the load balancer and hystrix for the circuit breaker.
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