springcloud05（Hystrix集群及集群监控turbine）

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。

集群三合一 ：
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修改配置
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.cjh.com:2001/eureka/,http://eureka2002.cjh.com:2002/eureka/,http://eureka2003.cjh.com:2003/eureka/

info:
  groupId: com.cjh.testSpringcloud
  artifactId: microservice-student-provider-hystrix-1004
  version: 1.0-SNAPSHOT
  userName: http://cjh.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.cjh.com:2001/eureka/,http://eureka2002.cjh.com:2002/eureka/,http://eureka2003.cjh.com:2003/eureka/

info:
  groupId: com.cjh.testSpringcloud
  artifactId: microservice-student-provider-hystrix-1005
  version: 1.0-SNAPSHOT
  userName: http://cjh.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.cjh.com:2001/eureka/,http://eureka2002.cjh.com:2002/eureka/,http://eureka2003.cjh.com:2003/eureka/

info:
  groupId: com.cjh.testSpringcloud
  artifactId: microservice-student-provider-hystrix-1006
  version: 1.0-SNAPSHOT
  userName: http://cjh.com
  phone: 123456

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 1500

启动类添加：

package com.cjh.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.cjh.*.*")
@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；

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>

application.yml

server:
  port: 91
  context-path: /
eureka:
  client:
    service-url:
      defaultZone: http://eureka2001.cjh.com:2001/eureka/,http://eureka2002.cjh.com:2002/eureka/,http://eureka2003.cjh.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、启动类MicroserviceStudentConsumerHystrixTurbine91Application 加注解：@EnableTurbine

package com.cjh.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);
    }

}

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();
    }

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.cjh.microservicecommon.service;

import com.cjh.microservicecommon.entity.Student;
import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author
 * @site
 * @company
 * @create 2019-11-23 14:42
 * 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
 */
@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