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Version: 2.7.0

1. Overview

1.1 Plugin Name​

  • Hystrix Plugin

1.2 Appropriate Scenario​

  • The backend service is unstable, use hystrix for protection

1.3 Plugin functionality​

  • Fusing the flow
  • Protect the application behind ShenYu Gateway
  • Isolation mode supports thread and semaphore.

1.4 Plugin code​

  • Core Module: shenyu-plugin-hystrix

  • Core Class: org.apache.shenyu.plugin.hystrix.HystrixPlugin

1.5 Added Since Which shenyu version​

  • Since ShenYu 2.4.0

2. How to use plugin

2.1 Plugin-use procedure chart​

2.2 Import pom​

  • Add hystrix dependency in the pom.xml file of the gateway.
<!-- apache shenyu hystrix plugin start-->
<dependency>
  <groupId>org.apache.shenyu</groupId>
  <artifactId>shenyu-spring-boot-starter-plugin-hystrix</artifactId>
  <version>${project.version}</version>
</dependency>
<!-- apache shenyu hystrix plugin end-->

2.3 Enable plugin​

  • In shenyu-admin--> BasicConfig --> Plugin --> hystrix set to enable.

2.4 Config plugin​

2.4.1 Plugin Config​

  • No Config, but you should open hystrix plugin.

2.4.2 Selector Config​

It is used to filter traffic for the first time and does not require handle fields.

For more information on selectors and rules configuration, see Selector And Rule Config , only some of the fields are covered here.

2.4.3 Rule Config​

  • For the final filtering of traffic, there is a rule handler logic, isolation mode supports thread and semaphore.

  • Hystrix handler details:

    • MinimumRequests: the minimum number of requests required to trigger a circuit breaker.

    • ErrorThresholdPercentage: percentage of exception occurring during that time.

    • Timeout(ms): execution timeout.

    • MaxConcurrentRequests: max concurrent requests.

    • Sleep(ms): The recovery time after the circuit breaker.

    • GroupKey: It is generally set to: contextPath.

    • CallBackUrl: default url /fallback/hystrix.

    • CommandKey: generally, it is set to a specific path interface.

2.5 Examples​

2.5.1 use hystrix protect application​

2.5.1.1 Preparation​

  • Start ShenYu Admin
  • Start ShenYu Bootstrap
  • Start a backend service

2.5.1.2 Selector Config​

2.5.1.3 Rule Config​

  • The rules in the pictures below are test examples, actual environment depends on the specific situation.

  • test example
@RestController
@RequestMapping("/test")
@ShenyuSpringMvcClient("/test/**")
public class HttpTestController {
    @PostMapping("/testHystrix")
    public ResultBean ok() {
        Random random = new Random();
        int num = random.nextInt(100);
        if (num > 20) {
            throw new RuntimeException();
        }
        return new ResultBean(200, "ok", null);
    }
}

2.5.1.4 Send Request With Apache Jmeter​

2.5.1.5 Check Result​

3. How to disable plugin

  • In shenyu-admin --> BasicConfig --> Plugin --> hystrix set Status disable.