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Spring Cloud Alibaba Sentinel 服务熔断

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我是靠谱客的博主 柔弱菠萝，最近开发中收集的这篇文章主要介绍Spring Cloud Alibaba Sentinel 服务熔断，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

文章目录

      • 1 摘要
      • 2 核心 Maven 依赖
      • 3 核心代码
        • 3.1 application 配置文件
        • 3.2 Service 层 - 核心Feign服务调用与熔断
        • 3.3 熔断回调方法
        • 3.4 熔断回调工厂
        • 3.5 Controller 控制层
        • 3.6 SpringBoot 启动类
        • 3.7 其他相关类
        • 3.8 手动标记 Sentinel 资源
      • 4 熔断测试
        • 4.1 准备工作
        • 4.2 正常接口请求
        • 4.3 接口限流，熔断测试
      • 5 推荐参考资料
      • 6 Github 源码

​
​

1 摘要

微服务之间相互调用，如果有一个服务出现故障，无法对外提供服务，那么调用该服务的应用也会跟着陷入无线的等待，直至客户端出现链接超时，这种客户体验及其不好，而且严重影响系统的效率。熔断机制的出现，就是为了解决这个问题。微服务的熔断机制基本原理为当一个服务(A)调用另一个服务(B)的时候，如果后一个服务(B)出现故障，则不影响前一个服务(A)，同时前者能够及时提供反馈到客户端，避免用户长久等待。

Spring Cloud 中的Hystrix 就是一个著名的微服务熔断组件，Sentinel 对其进行了适配，写法上与 Hystrix 保持基本一致，从而让开发者的迁移更加方便。

本文将介绍基于 Spring Cloud Alibaba 2.2 使用 Sentinel 实现服务熔断。

准备工作:

安装 Alibaba Sentinel

了解 Spring Cloud Alibaba Sentinel 流量限制控制台

Sentinel Gtihub: https://github.com/alibaba/Sentinel

Spring Cloud Alibaba Github: https://github.com/alibaba/spring-cloud-alibaba

​

2 核心 Maven 依赖

./cloud-alibaba-consumer-sentinel/pom.xml

    <dependencies>
        <!-- cloud alibaba -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>${spring-cloud-alibaba.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            <version>${spring-cloud-alibaba.version}</version>
        </dependency>
        <!-- cloud feign -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>${spring-cloud-openfeign.version}</version>
        </dependency>

        
        <!-- 省略其他依赖 -->

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

其中 ${spring-cloud-alibaba.version} 的版本为 2.2.3.RELEASE , ${spring-cloud-openfeign.version} 的版本为 2.2.5.RELEASE

注意事项: Spring Cloud Alibaba 2.2.3.RELEASE 版本支持的 Spring Boot 版本为 2.3.1.RELEASE ，建议在搭建项目时要保持版本的一致性，Spring Boot 版本过高或过低都可能导致不兼容问题

​

3 核心代码

3.1 application 配置文件

./cloud-alibaba-consumer-sentinel/src/main/resources/application.yml

## config

## server
server:
  port: 8608

## spring
spring:
  application:
    name: cloud-alibaba-consumer-sentinel
  cloud:
    nacos:
      discovery:
        server-addr: 172.16.140.10:8688
    sentinel:
      transport:
        dashboard: 172.16.140.10:8666
        port: 8720


## feign
feign:
  sentinel:
    enabled: true

## endpoint
management:
  endpoints:
    web:
      exposure:
        include: "*"

配置简要说明:

spring.application.name: 应用名称， Nacos 服务名称

spring.cloud.nacos.discovery.server-addr: Nacos 服务注册中心地址

spring.cloud.sentinel.transport.dashboard: Sentinel 控制台地址，包括 ip 和端口

spring.cloud.sentinel.transport.port: 客户端与 Sentinel 控制台的通讯端口，是项目所在服务器的端口，不是 Sentinel 控制台所在服务器的端口

feign.sentinel.enabled: 这里需要手动开启 Sentinel 对 Feign 的支持

3.2 Service 层 - 核心Feign服务调用与熔断

./cloud-alibaba-consumer-sentinel/src/main/java/com/ljq/demo/springboot/alibaba/consumer/sentinel/service/NacosConsumerService.java

package com.ljq.demo.springboot.alibaba.consumer.sentinel.service;

import com.ljq.demo.springboot.alibaba.consumer.sentinel.common.constant.NacosConst;
import com.ljq.demo.springboot.alibaba.consumer.sentinel.model.param.HelloParam;
import com.ljq.demo.springboot.alibaba.consumer.sentinel.service.fallback.ConsumerFallBackFactory;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.cloud.openfeign.SpringQueryMap;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;


/**
 * @Description: Nacos 服务消费者业务层
 * @Author: junqiang.lu
 * @Date: 2020/12/2
 */
@FeignClient(name = NacosConst.CLOUD_ALIBABA_SENTINEL_DASHBOARD, fallbackFactory = ConsumerFallBackFactory.class)
public interface NacosConsumerService {

    /**
     * hello
     * @param helloParam
     * @return
     */
    @GetMapping(value = "/api/cloud/alibaba/sentinel/dashboard/hello", produces = {MediaType.APPLICATION_JSON_VALUE})
    ResponseEntity<String> hello(@SpringQueryMap HelloParam helloParam);

    /**
     *
     * @param helloParam
     * @return
     */
    @PostMapping(value = "/api/cloud/alibaba/sentinel/dashboard/replay", produces = {MediaType.APPLICATION_JSON_VALUE})
    ResponseEntity<String> replay(@RequestBody HelloParam helloParam);


}

3.3 熔断回调方法

./cloud-alibaba-consumer-sentinel/src/main/java/com/ljq/demo/springboot/alibaba/consumer/sentinel/service/fallback/ConsumerFallBack.java

package com.ljq.demo.springboot.alibaba.consumer.sentinel.service.fallback;

import com.ljq.demo.springboot.alibaba.consumer.sentinel.model.param.HelloParam;
import com.ljq.demo.springboot.alibaba.consumer.sentinel.service.NacosConsumerService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.ResponseEntity;

/**
 * @Description: 熔断回调方法
 * @Author: junqiang.lu
 * @Date: 2020/12/2
 */
@Slf4j
public class ConsumerFallBack implements NacosConsumerService {

    private Throwable throwable;

    public ConsumerFallBack(Throwable throwable) {
        this.throwable = throwable;
    }

    /**
     * hello
     * @param helloParam
     * @return
     */
    @Override
    public ResponseEntity<String> hello(HelloParam helloParam) {
        String result = "Sorry," + helloParam.getName() + ",网络拥堵,稍后重试";
        log.info("call back result: {}", result);
        log.error("{}", throwable.getMessage());
        return ResponseEntity.ok(result);
    }

    /**
     * 回复
     *
     * @param helloParam
     * @return
     */
    @Override
    public ResponseEntity<String> replay(HelloParam helloParam) {
        String result = "Sorry," + helloParam.getName() + ",网络拥堵,稍后重试";
        log.info("call back result: {}", result);
        log.error("{}", throwable.getMessage());
        return ResponseEntity.ok(result);
    }


}

3.4 熔断回调工厂

./cloud-alibaba-consumer-sentinel/src/main/java/com/ljq/demo/springboot/alibaba/consumer/sentinel/service/fallback/ConsumerFallBackFactory.java

package com.ljq.demo.springboot.alibaba.consumer.sentinel.service.fallback;

import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;

/**
 * @Description: Nacos 熔断工厂
 * @Author: junqiang.lu
 * @Date: 2020/12/3
 */
@Component
public class ConsumerFallBackFactory implements FallbackFactory<ConsumerFallBack> {

    @Override
    public ConsumerFallBack create(Throwable cause) {
        return new ConsumerFallBack(cause);
    }
}

3.5 Controller 控制层

./cloud-alibaba-consumer-sentinel/src/main/java/com/ljq/demo/springboot/alibaba/consumer/sentinel/controller/NacosConsumerController.java

package com.ljq.demo.springboot.alibaba.consumer.sentinel.controller;

import com.ljq.demo.springboot.alibaba.consumer.sentinel.model.param.HelloParam;
import com.ljq.demo.springboot.alibaba.consumer.sentinel.service.NacosConsumerService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

/**
 * @Description: nacos 服务消费者控制层
 * @Author: junqiang.lu
 * @Date: 2020/12/2
 */
@Slf4j
@RestController
@RequestMapping("/api/nacos/consumer")
public class NacosConsumerController {

    @Autowired
    private NacosConsumerService consumerService;

    @GetMapping(value = "/hello", produces = {MediaType.APPLICATION_JSON_VALUE})
    public ResponseEntity<String> hello(HelloParam helloParam) {
        ResponseEntity<String> response = consumerService.hello(helloParam);
        log.info("response: {}", response.getBody());
        return response;
    }

    @PostMapping(value = "/replay", produces = {MediaType.APPLICATION_JSON_VALUE})
    public ResponseEntity<String> replay(@RequestBody HelloParam helloParam) {
        ResponseEntity<String> response = consumerService.replay(helloParam);
        log.info("response: {}", response.getBody());
        return response;
    }


}

3.6 SpringBoot 启动类

./cloud-alibaba-consumer-sentinel/src/main/java/com/ljq/demo/springboot/alibaba/consumer/sentinel/CloudAlibabaConsumerSentinelApplication.java

package com.ljq.demo.springboot.alibaba.consumer.sentinel;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author junqiang.lu
 */
@EnableDiscoveryClient
@EnableFeignClients
@SpringBootApplication
public class CloudAlibabaConsumerSentinelApplication {

    public static void main(String[] args) {
        SpringApplication.run(CloudAlibabaConsumerSentinelApplication.class, args);
    }

}

@EnableDiscoveryClient: spring cloud 服务发现注解，使用该注解可以在服务注册中心发现、管理该服务

@EnableFeignClients ：启用 Feign 的注解

3.7 其他相关类

请求参数类

./cloud-alibaba-consumer-sentinel/src/main/java/com/ljq/demo/springboot/alibaba/consumer/sentinel/model/param/HelloParam.java

package com.ljq.demo.springboot.alibaba.consumer.sentinel.model.param;

import lombok.Data;

import java.io.Serializable;

/**
 * @Description: 用户实体类
 * @Author: junqiang.lu
 * @Date: 2020/12/2
 */
@Data
public class HelloParam implements Serializable {

    private static final long serialVersionUID = -686738885661126900L;

    /**
     * 用户名
     */
    private String name;
}

常量类

./cloud-alibaba-consumer-sentinel/src/main/java/com/ljq/demo/springboot/alibaba/consumer/sentinel/common/constant/NacosConst.java

package com.ljq.demo.springboot.alibaba.consumer.sentinel.common.constant;

/**
 * @Description: Nacos 相关常量
 * @Author: junqiang.lu
 * @Date: 2020/12/2
 */
public class NacosConst {

    private NacosConst() {
    }

    public static final String CLOUD_ALIBABA_SENTINEL_DASHBOARD = "cloud-alibaba-sentinel-dashboard";
}

3.8 手动标记 Sentinel 资源

Sentinel 提供的注解 @SentinelResource 用于标记资源，其 value 属性即为资源识别编号，被标记后可以在 Sentinel 控制台对其进行流量监控和限制等操作，该注解不仅可以用在服务调用者上，还可以用在服务提供者上。本文主要介绍了 Sentinel 和 Feign 结合使用的示例，因此并没有用到该注解。在本示例中 @SentinelResource 可以再添加到 cloud-alibaba-sentinel-dashboard 项目 Controller 里提供的两个接口上。这样就可以做到更好地服务熔断。

更多信息可参考: 官方文档: Spring Cloud Alibaba Sentinel

​

4 熔断测试

4.1 准备工作

依次启动 Sentinel 控制台项目、待调用服务 cloud-alibaba-sentinel-dashboard 、当前项目服务 cloud-alibaba-consumer-sentinel

请求当前项目的两个接口(可暂不传参数，主要为了让 Sentinel 控制台显示当前服务)

打开 Sentinel 控制台

image-20201216195825289

​

4.2 正常接口请求

接口一:

接口地址与请求参数:

http://127.0.0.1:8608/api/nacos/consumer/hello?name=%E8%92%99%E5%A8%9C%E4%B8%BD%E8%8E%8E

请求方式: GET

返回结果:

Hello,蒙娜丽莎

服务消费者(cloud-alibaba-consumer-sentinel)日志:

2020-12-17 13:34:31.130  INFO 7339 --- [nio-8608-exec-1] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hello,蒙娜丽莎

服务提供者(cloud-alibaba-sentinel-dashboard)日志:

2020-12-17 13:34:31.014  INFO 7346 --- [nio-8606-exec-1] .d.s.a.s.d.c.SentinelDashboardController : serverPort: 8606
2020-12-17 13:34:31.015  INFO 7346 --- [nio-8606-exec-1] .d.s.a.s.d.c.SentinelDashboardController : result: Hello,蒙娜丽莎

接口二:

接口地址:

http://127.0.0.1:8608/api/nacos/consumer/replay

请求参数:

{
    "name": "马保国"
}

请求方式: POST

返回结果:

Hi,马保国,I'm fine,Thank you.

服务消费者(cloud-alibaba-consumer-sentinel)日志:

2020-12-17 13:34:35.425  INFO 7339 --- [nio-8608-exec-2] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hi,马保国,I'm fine,Thank you.

服务提供者(cloud-alibaba-sentinel-dashboard)日志:

2020-12-17 13:34:35.422  INFO 7346 --- [nio-8606-exec-2] .d.s.a.s.d.c.SentinelDashboardController : result: Hi,马保国,I'm fine,Thank you.

Sentinel 控制台界面

Sentinel 控制台

​

4.3 接口限流，熔断测试

对服务提供者的接口进行限流，QPS 上限为 5

操作步骤：

点击左侧「cloud-alibaba-sentinel-dashboard」,点击「簇点链路」，在hello 和 replay 接口右侧点击「流控」按钮，将 QPS 设置为 5

添加流量控制

添加成功后，点击左侧「流控规则」，展示设置的限流信息

流控规则列表

使用测试工具对接口进行测试

这里以 Postman 的 Runner 功能为例

image-20201217135727892

image-20201217140825715

请求的接口为服务消费者(cloud-alibaba-consumer-sentinel) 的两个接口

总共请求 1000 次，每间隔 10 毫秒请求一次，理论 QPS 为 100/2 = 50（Runner 是单线程串行请求接口的）

启动 Runner

Sentinel 控制台

image-20201217141156685

image-20201217141247365

服务消费者部分后台日志:

2020-12-17 14:12:02.061  INFO 7339 --- [nio-8608-exec-8] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hello,蒙娜丽莎
2020-12-17 14:12:02.103  INFO 7339 --- [nio-8608-exec-9] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hi,马保国,I'm fine,Thank you.
2020-12-17 14:12:02.144  INFO 7339 --- [io-8608-exec-10] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hello,蒙娜丽莎
2020-12-17 14:12:02.190  INFO 7339 --- [nio-8608-exec-1] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : call back result: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.190 ERROR 7339 --- [nio-8608-exec-1] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : [429] during [POST] to [http://cloud-alibaba-sentinel-dashboard/api/cloud/alibaba/sentinel/dashboard/replay] [NacosConsumerService#replay(HelloParam)]: [Blocked by Sentinel (flow limiting)]
2020-12-17 14:12:02.190  INFO 7339 --- [nio-8608-exec-1] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.227  INFO 7339 --- [nio-8608-exec-2] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : call back result: Sorry,蒙娜丽莎,网络拥堵,稍后重试
2020-12-17 14:12:02.227 ERROR 7339 --- [nio-8608-exec-2] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : [429] during [GET] to [http://cloud-alibaba-sentinel-dashboard/api/cloud/alibaba/sentinel/dashboard/hello?serialVersionUID=-686738885661126900&name=%E8%92%99%E5%A8%9C%E4%B8%BD%E8%8E%8E] [NacosConsumerService#hello(HelloParam)]: [Blocked by Sentinel (flow limiting)]
2020-12-17 14:12:02.227  INFO 7339 --- [nio-8608-exec-2] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Sorry,蒙娜丽莎,网络拥堵,稍后重试
2020-12-17 14:12:02.276  INFO 7339 --- [nio-8608-exec-3] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : call back result: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.276 ERROR 7339 --- [nio-8608-exec-3] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : [429] during [POST] to [http://cloud-alibaba-sentinel-dashboard/api/cloud/alibaba/sentinel/dashboard/replay] [NacosConsumerService#replay(HelloParam)]: [Blocked by Sentinel (flow limiting)]
2020-12-17 14:12:02.276  INFO 7339 --- [nio-8608-exec-3] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.324  INFO 7339 --- [nio-8608-exec-4] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : call back result: Sorry,蒙娜丽莎,网络拥堵,稍后重试
2020-12-17 14:12:02.324 ERROR 7339 --- [nio-8608-exec-4] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : [429] during [GET] to [http://cloud-alibaba-sentinel-dashboard/api/cloud/alibaba/sentinel/dashboard/hello?serialVersionUID=-686738885661126900&name=%E8%92%99%E5%A8%9C%E4%B8%BD%E8%8E%8E] [NacosConsumerService#hello(HelloParam)]: [Blocked by Sentinel (flow limiting)]
2020-12-17 14:12:02.324  INFO 7339 --- [nio-8608-exec-4] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Sorry,蒙娜丽莎,网络拥堵,稍后重试
2020-12-17 14:12:02.374  INFO 7339 --- [nio-8608-exec-5] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : call back result: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.374 ERROR 7339 --- [nio-8608-exec-5] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : [429] during [POST] to [http://cloud-alibaba-sentinel-dashboard/api/cloud/alibaba/sentinel/dashboard/replay] [NacosConsumerService#replay(HelloParam)]: [Blocked by Sentinel (flow limiting)]
2020-12-17 14:12:02.374  INFO 7339 --- [nio-8608-exec-5] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.411  INFO 7339 --- [nio-8608-exec-6] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : call back result: Sorry,蒙娜丽莎,网络拥堵,稍后重试
2020-12-17 14:12:02.411 ERROR 7339 --- [nio-8608-exec-6] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : [429] during [GET] to [http://cloud-alibaba-sentinel-dashboard/api/cloud/alibaba/sentinel/dashboard/hello?serialVersionUID=-686738885661126900&name=%E8%92%99%E5%A8%9C%E4%B8%BD%E8%8E%8E] [NacosConsumerService#hello(HelloParam)]: [Blocked by Sentinel (flow limiting)]
2020-12-17 14:12:02.411  INFO 7339 --- [nio-8608-exec-6] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Sorry,蒙娜丽莎,网络拥堵,稍后重试
2020-12-17 14:12:02.454  INFO 7339 --- [nio-8608-exec-7] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : call back result: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.454 ERROR 7339 --- [nio-8608-exec-7] c.l.d.s.a.c.s.s.f.ConsumerFallBack       : [429] during [POST] to [http://cloud-alibaba-sentinel-dashboard/api/cloud/alibaba/sentinel/dashboard/replay] [NacosConsumerService#replay(HelloParam)]: [Blocked by Sentinel (flow limiting)]
2020-12-17 14:12:02.454  INFO 7339 --- [nio-8608-exec-7] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Sorry,马保国,网络拥堵,稍后重试
2020-12-17 14:12:02.505  INFO 7339 --- [nio-8608-exec-8] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hello,蒙娜丽莎
2020-12-17 14:12:02.557  INFO 7339 --- [nio-8608-exec-9] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hi,马保国,I'm fine,Thank you.
2020-12-17 14:12:02.619  INFO 7339 --- [io-8608-exec-10] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hello,蒙娜丽莎
2020-12-17 14:12:02.678  INFO 7339 --- [nio-8608-exec-1] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hi,马保国,I'm fine,Thank you.
2020-12-17 14:12:02.759  INFO 7339 --- [nio-8608-exec-2] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hello,蒙娜丽莎
2020-12-17 14:12:02.846  INFO 7339 --- [nio-8608-exec-3] c.l.d.s.a.c.s.c.NacosConsumerController  : response: Hi,马保国,I'm fine,Thank you.

Postman 部分日志:

image-20201217141554548

测试结果可以看出服务提供者端的QPS 在限流之后最高只能达到5，超过的部分请求均被拒绝。在后台日志中可以看出请求被拒绝之后走了熔断方法。从Postman日志中可以看出一个完整请求的时间很短(50毫秒以内)，并没有处于长时间的等待，从而提升了用户体验。

至此，已经实现了使用 Sentinel 对服务进行限流，以及集成 Feign 对服务进行熔断控制的功能。

​

5 推荐参考资料

官方文档: Spring Cloud Alibaba Sentinel

Spring Cloud Alibaba系列教程 - Spring Cloud Alibaba 熔断(Sentinel)

​

6 Github 源码

Gtihub 源码地址 : https://github.com/Flying9001/springBootDemo

个人公众号:404Code,分享半个互联网人的技术与思考，感兴趣的可以关注.
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