Hystrix - Example

Example of hystrix with feign usage in Spring Boot

Used Docker to containerize environment.

Hello World Service

• It has only one functionality. It returns a string from an endpoint.

Example Service

• It requests Hello World Service. If hello world service is unavailable/returns an error, it uses fallback (fixed, fake response from hello world service)
• It is configured with requestVolumeThreshold: 5 and sleepWindowInMilliseconds: 300000. When 5 requests fails to hello world service it will use fallback for the next 5 minutes without making any request to hello world service.
• If it managed to request hello world service, this response is returned: hello world from hello-world service, if it uses the fallback: hello world from example-service

How to run the environment?

Before you start

• Make sure you have Docker and docker-compose installed.

Docker CE INSTALLATION
Docker Compose INSTALLATION

Start the environment

1. Build services:
   docker-compose build
2. Run services:
   docker-compose up
3. Stop the hello world service to test hystrix:
   docker-compose stop hello-world-service
4. Run hello-world-service again:
   docker-compose up hello-world-service

Important endpoints:

• http://localhost:8080/test - Example service will request hello-world-service or use fallback and return a string.