Hystrix集群及监控turbine

前面Dashboard演示的仅仅是单机服务监控，实际项目基本都是集群，所以这里集群监控用的是turbine。

turbine是基于Dashboard的。

先搞个集群；

再microservice-student-provider-hystrix-1004项目的基础上再搞一个microservice-student-provider-hystrix

代码和配置都复制一份，然后修改几个地方；

1、yml配置

---

server:

  port: 1004

  context-path: /

spring:

  datasource:

    type: com.alibaba.druid.pool.DruidDataSource

    driver-class-name: com.mysql.jdbc.Driver

    url: jdbc:mysql://localhost:3306/t224?useUnicode=true&characterEncoding=utf8

    username: root

    password: 123

  jpa:

    hibernate:

      ddl-auto: update

    show-sql: true

  application:

    name: microservice-student

  profiles: provider-hystrix-1004

eureka:

  instance:

    hostname: localhost

    appname: microservice-student

    instance-id: microservice-student:1004

    prefer-ip-address: true

  client:

    service-url:

      defaultZone: http://eureka2001.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.com:2003/eureka/

info:

  groupId: com.liuwenwu.springcloud

  artifactId: microservice-student-provider-hystrix-1004

  version: 1.0-SNAPSHOT

  userName: http://liuwenwu.com

  phone: 123456

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

---

server:

  port: 1005

  context-path: /

spring:

  datasource:

    type: com.alibaba.druid.pool.DruidDataSource

    driver-class-name: com.mysql.jdbc.Driver

    url: jdbc:mysql://localhost:3306/t224?useUnicode=true&characterEncoding=utf8

    username: root

    password: 123

  jpa:

    hibernate:

      ddl-auto: update

    show-sql: true

  application:

    name: microservice-student

  profiles: provider-hystrix-1005

eureka:

  instance:

    hostname: localhost

    appname: microservice-student

    instance-id: microservice-student:1005

    prefer-ip-address: true

  client:

    service-url:

      defaultZone: http://eureka2001.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.com:2003/eureka/

info:

  groupId: com.liuwenwu.springcloud

  artifactId: microservice-student-provider-hystrix-1005

  version: 1.0-SNAPSHOT

  userName: http://liuwenwu.com

  phone: 123456

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

---

server:

  port: 1006

  context-path: /

spring:

  datasource:

    type: com.alibaba.druid.pool.DruidDataSource

    driver-class-name: com.mysql.jdbc.Driver

    url: jdbc:mysql://localhost:3306/t224?useUnicode=true&characterEncoding=utf8

    username: root

    password: 123

  jpa:

    hibernate:

      ddl-auto: update

    show-sql: true

  application:

    name: microservice-student

  profiles: provider-hystrix-1006

eureka:

  instance:

    hostname: localhost

    appname: microservice-student

    instance-id: microservice-student:1006

    prefer-ip-address: true

  client:

    service-url:

      defaultZone: http://eureka2001.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.com:2003/eureka/

info:

  groupId: com.liuwenwu.springcloud

  artifactId: microservice-student-provider-hystrix-1006

  version: 1.0-SNAPSHOT

  userName: http://liuwenwu.com

  phone: 123456

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

2、启动类配置

package com.liuwenwu.microservicestudentproviderhystrix;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.domain.EntityScan;

import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableCircuitBreaker

@EntityScan("com.liuwenwu.*.*")

@EnableEurekaClient

@SpringBootApplication

public class MicroserviceStudentProviderHystrixApplication {

    public static void main(String[] args) {

        SpringApplication.run(MicroserviceStudentProviderHystrixApplication.class, args);

    }

}

这样的话就有了 hystrix集群服务；

3、我们新建项目microservice-student-consumer-hystrix-turbine-91

pom.xml加下依赖

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-actuator</artifactId>

</dependency>

<dependency>

    <groupId>org.springframework.cloud</groupId>

    <artifactId>spring-cloud-starter-turbine</artifactId>

</dependency>

4、application.yml

server:

  port: 91

  context-path: /

eureka:

  client:

    service-url:

      defaultZone: http://eureka2001.liuwenwu.com:2001/eureka/,http://eureka2002.liuwenwu.com:2002/eureka/,http://eureka2003.liuwenwu.com:2003/eureka/

turbine:

  app-config: microservice-student   # 指定要监控的应用名称

  clusterNameExpression: "'default'" #表示集群的名字为default

spring:

  application:

    name: turbine

1、新建启动类MicroserviceStudentConsumerHystrixTurbine91Application 加注解：@EnableTurbine

package com.liuwenwu.microservicestudentconsumerhystrixturbine91;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;

import org.springframework.cloud.netflix.turbine.EnableTurbine;

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})

@EnableTurbine

public class MicroserviceStudentConsumerHystrixTurbine91Application {

    public static void main(String[] args) {

        SpringApplication.run(MicroserviceStudentConsumerHystrixTurbine91Application.class, args);

    }

}

测试：

先启动三个eureka，然后把1004 1005 带hystrix的服务都启动；

microservice-student-consumer-80这个也启动，方便测试；

dashboard，turbine启动；

这样的话 http://localhost/student/hystrix 就能调用服务集群；

http://localhost:91/turbine.stream 可以监控数据，实时ping 返回data

输入http://localhost:90/hystrix进入仪表盘，输入地址

点击进入集群监控仪表：

Feign、Hystrix整合

前面的代码，用@HystrixCommand fallbackMethod是很不好的，因为和业务代码耦合度太高，不利于维护，所以需要解耦，这我们讲下Feign Hystrix整合。

1、microservice-student-provider-hystrix项目修改

我们不用原先那套。按照正常的逻辑来写；

StudentService加新的接口方法：

/**

 * 测试Hystrix服务降级

 * @return

 */

public Map<String,Object> hystrix();

StudentServiceImpl写具体实现：

@Override

public Map<String, Object> hystrix() {

    Map<String,Object> map=new HashMap<String,Object>();

    map.put("code", 200);

    map.put("info","工号【"+port+"】正在为您服务");

    return map;

}

StudentProviderController正常调用service方法：

/**

     * 测试Hystrix服务降级

     * @return

     * @throws InterruptedException

     */

    @ResponseBody

    @GetMapping(value="/hystrix")

    @HystrixCommand(fallbackMethod="hystrixFallback")

    public Map<String,Object> hystrix() throws InterruptedException{

        Thread.sleep(2000);

//        Map<String,Object> map=new HashMap<String,Object>();

//        map.put("code", 200);

//        map.put("info","工号【"+port+"】正在为您服务");

        return studentService.hystrix();

    }

2、microservice-common项目新建FallbackFactory类，解耦服务熔断服务降级

StudentClientService接口，新增getInfo方法；

/**

 * 服务熔断降级

 * @return

 */

@GetMapping(value="/student/hystrix")

public Map<String,Object> hystrix();

新建 StudentClientFallbackFactory 类，实现FallbackFactory<StudentClientService>接口；

package com.liuwenwu.microservicecommon.FallbackFactory;

import com.liuwenwu.microservicecommon.entity.Student;

import com.liuwenwu.microservicecommon.service.StudentClientService;

import feign.hystrix.FallbackFactory;

import org.springframework.stereotype.Component;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

 * @author LWW

 * @site www.lww.com

 * @company

 * @create 2019-11-23 14:50

 *

 * 作用，将所有service层业务方法可能出现故障，需要定义对应的快速返回方法的处理集合

 * add/del/edit/query...

 * StudentClientFallbackFactory

 * add/del/edit/query...对应的快速回退措施

 *

 */

@Component

public class StudentClientFallbackFactory implements FallbackFactory<StudentClientService> {

    @Override

    public StudentClientService create(Throwable throwable) {

        return new StudentClientService() {

            @Override

            public Student get(Integer id) {

                return null;

            }

            @Override

            public List<Student> list() {

                return null;

            }

            @Override

            public boolean save(Student student) {

                return false;

            }

            @Override

            public boolean delete(Integer id) {

                return false;

            }

            @Override

            public String ribbon() {

                return null;

            }

            @Override

            public Map<String, Object> hystrix() {

                Map<String,Object> map=new HashMap<String,Object>();

                map.put("code", 500);

                map.put("info", "系统繁忙，稍后重试");

                return map;

            }

        };

    }

}

StudentClientService接口的@FeignClient注解加下 fallbackFactory属性

@FeignClient(value="MICROSERVICE-STUDENT",fallbackFactory=StudentClientFallbackFactory.class)

这类我们实现了降级处理方法实现；

3、microservice-student-consumer-feign-80修改支持Hystrix

StudentConsumerFeignController新增方法调用

/**

 * Feign整合Hystrix服务熔断降级

 * @return

 * @throws InterruptedException

 */

@GetMapping(value="/hystrix")

public Map<String,Object> hystrix() throws InterruptedException{

    return studentClientService.hystrix();

}

4、microservice-common的application.yml加上hystrix支持

feign:

  hystrix:

    enabled: true

测试开启三个eureka，以及带hystrix的provider，和带feign,hystrix的consummer。

测试的话，也是没问题的。0.9秒的话，返回正常信息；超过1秒的话，就返回错误提示；

集群后超时设置

上面错误是什么原因呢，咱们明明在Hystrix中的application.yml中设置了

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

这里因为还有一个 feign 也有一个超时时间的设置，当然feign底层是 ribbon的封装，所以直接配置ribbon，ribbon默认超时也是1秒。

所以这里都是强制要求，ribbon的超时时间要大于hystrix的超时时间，否则 hystrix自定义的超时时间毫无意义。

所以还得microservice-student-consumer-feign-80上加个 ribbon超时时间设置

ribbon:

  ReadTimeout: 10000

  ConnectTimeout: 9000

这样就完工了。可以自行测试。