微服务熔断限流Hystrix之Dashboard

简介

hystrix dashboard是一款针对hystrix进行实时监控的工具，通过hystrix dashboard可以直观地看到各hystrix command的请求响应时间，请求成功率等数据。

快速上手

工程说明

工程名	端口	作用
eureka-server	8761	注册中心
service-hi	8762	服务提供者
service-consumer	8763	服务消费者

核心代码

eureka-server 工程

pom.xml

<dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-web</artifactid>
</dependency>
<dependency>
    <groupid>org.springframework.cloud</groupid>
    <artifactid>spring-cloud-starter-netflix-eureka-server</artifactid>
</dependency>

application.yml

server:
  port: 8761
eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultzone: http://${eureka.instance.hostname}:/${server.port}/eureka/
spring:
  application:
    name: eureka-server

启动类

@springbootapplication
@enableeurekaserver
public class eurekaserverapplication {

    public static void main(string[] args) {
        springapplication.run( eurekaserverapplication.class, args );
    }

}

service-hi 工程

pom.xml

<dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-web</artifactid>
</dependency>
<dependency>
    <groupid>org.springframework.cloud</groupid>
    <artifactid>spring-cloud-starter-netflix-eureka-client</artifactid>
</dependency>

application.yml

server:
  port: 8762

spring:
  application:
    name: service-hi
eureka:
  client:
    service-url:
      defaultzone: http://localhost:8761/eureka/

hellocontroller

@restcontroller
public class hellocontroller {

    @getmapping("/hi")
    public string hi() {
        return "hello ~";
    }

    @getmapping("/hey")
    public string hey() {
        return "hey ~";
    }


    @getmapping("/oh")
    public string oh() {
        return "ah ~";
    }

    @getmapping("/ah")
    public string ah() {
        //模拟接口1/3的概率超时
        random rand = new random();
        int randomnum = rand.nextint(3) + 1;
        if (3 == randomnum) {
            try {
                thread.sleep( 3000 );
            } catch (interruptedexception e) {
                e.printstacktrace();
            }
        }
        return "来了老弟~";
    }

}

启动类

@springbootapplication
@enableeurekaclient
public class servicehiapplication {

    public static void main(string[] args) {
        springapplication.run( servicehiapplication.class, args );
    }

}

service-consumer 工程

pom.xml

<dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-web</artifactid>
</dependency>
<dependency>
    <groupid>org.springframework.cloud</groupid>
    <artifactid>spring-cloud-starter-netflix-eureka-client</artifactid>
</dependency>
<dependency>
    <groupid>org.springframework.cloud</groupid>
    <artifactid>spring-cloud-starter-netflix-ribbon</artifactid>
</dependency>
<dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-actuator</artifactid>
</dependency>
<dependency>
    <groupid>org.springframework.cloud</groupid>
    <artifactid>spring-cloud-starter-netflix-hystrix</artifactid>
</dependency>
<dependency>
    <groupid>org.springframework.cloud</groupid>
    <artifactid>spring-cloud-starter-netflix-hystrix-dashboard</artifactid>
</dependency>

application.yml

server:
  port: 8763

  tomcat:
    uri-encoding: utf-8
    max-threads: 1000
    max-connections: 20000

spring:
  application:
    name: service-consumer
eureka:
  client:
    service-url:
      defaultzone: http://localhost:8761/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"
      cors:
        allowed-origins: "*"
        allowed-methods: "*"

helloservice

@service
public class helloservice {

    @autowired
    private resttemplate resttemplate;

    /**
     * 简单用法
     */
    @hystrixcommand
    public string hiservice() {
        return resttemplate.getforobject("http://service-hi/hi" , string.class);
    }

    /**
     * 定制超时
     */
    @hystrixcommand(commandproperties = {
            @hystrixproperty(name = "execution.isolation.thread.timeoutinmilliseconds", value = "30000") })
    public string heyservice() {
        return resttemplate.getforobject("http://service-hi/hey" , string.class);
    }

    /**
     * 定制降级方法
     */
    @hystrixcommand(fallbackmethod = "getfallback")
    public string ahservice() {
        return resttemplate.getforobject("http://service-hi/ah" , string.class);
    }

    /**
     * 定制线程池隔离策略
     */
    @hystrixcommand(fallbackmethod = "getfallback",
            threadpoolkey = "studentservicethreadpool",
            threadpoolproperties = {
                    @hystrixproperty(name="coresize", value="30"),
                    @hystrixproperty(name="maxqueuesize", value="50")
            }
    )
    public string ohservice() {
        return resttemplate.getforobject("http://service-hi/oh" , string.class);
    }


    public string getfallback() {
        return "oh , sorry , error !";
    }


}

hellocontroller

@restcontroller
public class hellocontroller {

    @autowired
    private helloservice helloservice;


    @getmapping("/hi")
    public string hi() {
        return helloservice.hiservice();
    }

    @getmapping("/hey")
    public string hey() {
        return helloservice.heyservice();
    }

    @getmapping("/oh")
    public string oh() {
        return helloservice.ohservice();
    }

    @getmapping("/ah")
    public string ah() {
        return helloservice.ahservice();
    }


}

启动类

@springbootapplication
@enableeurekaclient
@enablehystrixdashboard
@enablehystrix
@enablecircuitbreaker
public class serviceconsumerapplication {

    public static void main(string[] args) {
        springapplication.run( serviceconsumerapplication.class, args );
    }

    @loadbalanced
    @bean
    public resttemplate resttemplate() {
        return new resttemplate();
    }

}

hystrix dashboard 的使用

json格式监控信息

先访问http://localhost:8762/hi
再打开http://localhost:8763/actuator/hystrix.stream，可以看到一些具体的数据：

hystrix仪表盘监控信息

单纯的查看json数据，很难分析出结果，所以，要在hystrix仪表盘中来查看这一段json，在hystrix仪表盘中输入监控地址进行监控：
打开仪表盘地址：http://localhost:8762/hystrix

在界面依次输入：http://localhost:8763/actuator/hystrix.stream 、2000 、service-consumer；点确定。

hystrix仪表盘指标含义

测试

编一个测试脚本curl.sh

while true;
do
curl "http://localhost:8763/hi";
curl "http://localhost:8763/hey";
curl "http://localhost:8763/oh";
curl "http://localhost:8763/ah";
done

执行测试脚本，查看hystrix仪表盘：

可以看出 ahservice 因为模拟了1/3的概率超时，所以监控中呈现了30%左右的错误百分比。

源码

https://github.com/gf-huanchupk/springcloudlearning/tree/master/chapter17

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