Hystrix与Feign的服务集群和监控服务集群的turbine

1、Hystrix集群及监控turbine

在microservice-student-provider-hystrix-1004的基础上建立新项目microservice-student-provider-hystrix
参考博文https://blog.youkuaiyun.com/water_java/article/details/103933914
改变一下yml文件

---
server:
  port: 1004
  context-path: /

eureka:
  instance:
    hostname: localhost  #eureka客户端主机实例名称
    appname: microservice-student  #客户端服务名
    instance-id: microservice-student:1004 #客户端实例名称
    prefer-ip-address: true #显示IP
  client:
    service-url:
      defaultZone: http://eureka2001.hsl.com:2001/eureka/,http://eureka2002.hsl.com:2002/eureka/,http://eureka2003.hsl.com:2003/eureka/   #把服务注册到eureka注册中心

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
    username: root
    password: 1234
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application:
    name: microservice-student
  profiles: provider-hystrix-1004

#暴露全部的监控信息
#management:
#  endpoints:
#    web:
#      exposure:
#        include: "*"

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

info:
  groupId: com.hsl.testSpringcloud
  artifactId: microservice-student-provider-hystrix-1004
  version: 1.0-SNAPSHOT
  userName: http://hsl.com
  phone: 123456
---
server:
  port: 1005
  context-path: /

eureka:
  instance:
    hostname: localhost  #eureka客户端主机实例名称
    appname: microservice-student  #客户端服务名
    instance-id: microservice-student:1005 #客户端实例名称
    prefer-ip-address: true #显示IP
  client:
    service-url:
      defaultZone: http://eureka2001.hsl.com:2001/eureka/,http://eureka2002.hsl.com:2002/eureka/,http://eureka2003.hsl.com:2003/eureka/   #把服务注册到eureka注册中心

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
    username: root
    password: 1234
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application:
    name: microservice-student
  profiles: provider-hystrix-1005

#暴露全部的监控信息
#management:
#  endpoints:
#    web:
#      exposure:
#        include: "*"

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

info:
  groupId: com.hsl.testSpringcloud
  artifactId: microservice-student-provider-hystrix-1005
  version: 1.0-SNAPSHOT
  userName: http://hsl.com
  phone: 123456

---
server:
  port: 1006
  context-path: /

eureka:
  instance:
    hostname: localhost  #eureka客户端主机实例名称
    appname: microservice-student  #客户端服务名
    instance-id: microservice-student:1006 #客户端实例名称
    prefer-ip-address: true #显示IP
  client:
    service-url:
      defaultZone: http://eureka2001.hsl.com:2001/eureka/,http://eureka2002.hsl.com:2002/eureka/,http://eureka2003.hsl.com:2003/eureka/   #把服务注册到eureka注册中心

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
    username: root
    password: 1234
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  application:
    name: microservice-student
  profiles: provider-hystrix-1006

#暴露全部的监控信息
#management:
#  endpoints:
#    web:
#      exposure:
#        include: "*"

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

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

新建项目microservice-student-consumer-hystrix-turbine-91
pom依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.hsl</groupId>
        <artifactId>t237microservice</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>microservice-student-consumer-hystrix-turbine-91</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <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>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

yml文件配置

server:
  port: 91
  context-path: /
eureka:
  client:
    service-url:
      defaultZone: http://eureka2001.hsl.com:2001/eureka/,http://eureka2002.hsl.com:2002/eureka/,http://eureka2003.hsl.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

启动类：MicroserviceStudentConsumerHystrixTurbine91Application 添加注解@EnableTurbine

package com.hsl.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;
@EnableTurbine
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class MicroserviceStudentConsumerHystrixTurbine91Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceStudentConsumerHystrixTurbine91Application.class, args);
    }

}

StudentProviderController

配置差异性启动：
两份microservice-student-provider-hystrix，分别为1005，1006
启动注册中心，1004，1005，1006，microservice-student-consumer-80，dashboard，turbine

注册中心

访问：http://localhost/student/hystrix



访问：http://localhost:91/turbine.stream

http://localhost:90/hystrix进入仪表盘
输入地址：http://localhost:91/turbine.stream

2、Feign、Hystrix整合之服务熔断服务降级彻底解耦

之前使用@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，这里使用feign和hystrix整合

service层添加代码
StudentService

 /**
     * 测试Hystrix服务降级
     * @return
     */
    public Map<String,Object> hystrix();

实现类：

 @Value("${server.port}")
    private Integer port;


 @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;
    }

controller层

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.hsl.microservicecommon.service;

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

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

@Component
public class StudentClientFallbackFactory implements FallbackFactory<StudentClientService> {

    @Override
    public StudentClientService create(Throwable cause) {
        return new StudentClientService() {

            @Override
            public boolean save(Student student) {
                return false;
            }

            @Override
            public List<Student> list() {
                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;
            }

            @Override
            public Student get(Integer id) {
                return null;
            }

            @Override
            public boolean delete(Integer id) {
                return false;
            }

            @Override
            public String ribbon() {
                return null;
            }
        };
    }

}

StudentClientService接口的@FeignClient注解加下 fallbackFactory属性

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

microservice-student-consumer-feign-80修改 支持Hystrix
StudentConsumerFeignController新增方法：

/**
 * 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();
}

microservice-student-consumer-feign-80的yml文件修改，加上hystrix支持

feign:
  hystrix:
    enabled: true

microservice-student-consumer-feign-80的启动类上添加公共模块

注意：
 公共子项目与当前子项目的基包都要扫描到；
 只指定公共子模块为基包会导致本子项目的springmvc功能失效；
 只指定本子项目为基包会导致feign与Hystrix集成失败，从而导致服务熔断功能失效

@ComponentScan(basePackages = {"com.hsl.microservicecommon","com.hsl.microservicestudentconsumerfeign80"})

改变microservice-student-provider-hystrix的controller层

改变microservice-student-provider-hystrix-1004的controller层

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

访问http://localhost:1004/student/hystrix服务正常服务

http://localhost:1005/student/hystrix和http://localhost：1006/student/hystrix应该出现服务熔断，服务繁忙的提示
可是出现的结果如下：


搭建失败，熔断未生效，可能出现雪崩

出现这样现象的原因：

虽然在Hystrix中的yml文件中设置了超时设置：

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

但是还有一个 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。

解决方式就是后面的集群后超时设置

3、集群后超时设置

为解决上面的问题，得在microservice-student-consumer-feign-80的yml文件上加个 ribbon超时时间设置

ribbon:
  ReadTimeout: 10000
  ConnectTimeout: 9000

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

这样既把代码解耦了，也解决了雪崩的问题
测试：
启动注册中心，启动三个生产者（1004，1005，1006），启动dashboard，turbine,feign