Circuit Breaker Microservice

In this post we ll see how to configure netflix hystrix fault tolerance library along with spring boot microservice.

Circuit breaker microservice.

To demo circuit breaker we will create following two microservices where first is dependent on another. The circuit breaker pattern is the solution to this problem. The basic idea behind the circuit breaker is very simple. If the call to the supplier microservice.

You will build a microservice application that uses the circuit breaker pattern to gracefully degrade functionality when a method call fails. You have applied the microservice architecture services sometimes collaborate when handling requests. It uses this mechanism to make a trial call to the supplier microservice periodically to check if it has recovered. It will be a rest based service.

So when the circuit breaker is in the open state it usually jumps to the half open state. Circuit breaker is a design pattern to create resilient microservices by limiting the impact of service failures and latencies. Student microservice which will give some basic functionality on student entity. Fortunately if the supplier microservice responds the circuit breaker goes back to the closed state.

Circuit breaker does a great job in protecting the service from a heavy load. If the supplier microservice doesn t reply within a specific threshold the circuit breaker will switch back to the open state from the half open state. Use of the circuit breaker pattern can let a microservice continue operating when a related service fails preventing the failure from cascading and giving the failing service time to recover. This microservices tutorial shows how to set up a netflix hystrix circuit breaker to fix potential cascading failures from microservice dependencies.

Hystrix circuit breaker example. Circuit breakers in half open state. An application can combine these two patterns. You wrap a protected function call in a circuit breaker object which.

The circuit breaker pattern prevents an application from performing an operation that s likely to fail. When one service synchronously invokes another there is always the possibility that the other service is unavailable or is exhibiting such high latency it is essentially unusable. In a microservice landscape failing fast is critical. Hystrix library provides an implementation of the circuit breaker pattern using which you can apply circuit breakers to potentially failing method calls.

The circuit breaker uses a monitoring and feedback mechanism called the half open state to know if and when the supplier microservice has recovered.