Hystrix集羣及監控turbine
前面Dashboard演示的僅僅是單機服務監控,實際項目基本都是集羣,所以這裏集羣監控用的是turbine。
說明:本篇博客基於上一篇的配置 springCould 之 Hystrix斷路器
新建服務提供這集羣項目(這是一個項目,通過不同配置達到集羣的目的)和上片博客中microservice-book-provider-hystrix-1005一樣copy就行了,下面是不同的部分
application.yml
---
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/cpc?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
username: root
password: root
jpa:
hibernate:
ddl-auto: update
show-sql: true
application:
name: microservice-book
profiles: provider-hystrix-1004
eureka:
instance:
hostname: localhost
appname: microservice-book
instance-id: microservice-book:1004
prefer-ip-address: true
client:
service-url:
defaultZone: http://eureka2001.cpc.com:2001/eureka/,http://eureka2002.cpc.com:2002/eureka/,http://eureka2003.cpc.com:2003/eureka/
info:
groupId: com.cpc.testSpringcloud
artifactId: microservice-book-provider-hystrix-1004
version: 1.0-SNAPSHOT
userName: http://cpc.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/cpc?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
username: root
password: root
jpa:
hibernate:
ddl-auto: update
show-sql: true
application:
name: microservice-book
profiles: provider-hystrix-1005
eureka:
instance:
hostname: localhost
appname: microservice-book
instance-id: microservice-book:1005
prefer-ip-address: true
client:
service-url:
defaultZone: http://eureka2001.cpc.com:2001/eureka/,http://eureka2002.cpc.com:2002/eureka/,http://eureka2003.cpc.com:2003/eureka/
info:
groupId: com.cpc.testSpringcloud
artifactId: microservice-book-provider-hystrix-1005
version: 1.0-SNAPSHOT
userName: http://cpc.com
phone: 123456
hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 10000
---
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/cpc?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
username: root
password: root
jpa:
hibernate:
ddl-auto: update
show-sql: true
application:
name: microservice-book
profiles: provider-hystrix-1006
eureka:
instance:
hostname: localhost
appname: microservice-book
instance-id: microservice-book:1006
prefer-ip-address: true
client:
service-url:
defaultZone: http://eureka2001.cpc.com:2001/eureka/,http://eureka2002.cpc.com:2002/eureka/,http://eureka2003.cpc.com:2003/eureka/
info:
groupId: com.cpc.testSpringcloud
artifactId: microservice-book-provider-hystrix-1006
version: 1.0-SNAPSHOT
userName: http://cpc.com
phone: 123456
hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 10000
啓動類:
package com.cpc.microservicebookproviderhystrix;
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 //關鍵部分
@EntityScan("com.cpc.*.*")
@EnableEurekaClient
@SpringBootApplication
public class MicroserviceBookProviderHystrixApplication {
public static void main(String[] args) {
SpringApplication.run(MicroserviceBookProviderHystrixApplication.class, args);
}
}
Run/Debug Configurations
消費者集羣配置完成了
新建項目microservice-book-consumer-hystrix-turbine-91
pom.xml加下依賴
<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.cpc.com:2001/eureka/,http://eureka2002.cpc.com:2002/eureka/,http://eureka2003.cpc.com:2003/eureka/
turbine:
app-config: microservice-book # 指定要監控的應用名稱
clusterNameExpression: "'default'" #表示集羣的名字爲default
spring:
application:
name: turbine
啓動類
package com.cpc.microservicebookconsumerhystrixturbine91;
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 MicroserviceBookConsumerHystrixTurbine91Application {
public static void main(String[] args) {
SpringApplication.run(MicroserviceBookConsumerHystrixTurbine91Application.class, args);
}
}
測試
先啓動三個eureka,然後把帶剛剛配置帶的 hystrix 的服務都啓動;
microservice-book-consumer-80(消費者)
這個也啓動,方便測試;啓動dashboard服務,啓動turbine服務;
http://localhost:91/turbine.stream 可以監控數據,實時ping 返回data
輸入http://localhost:90/hystrix進入儀表盤,輸入地址
點擊 進入集羣監控儀表:
服務降級
所謂降級,一般是從整體負荷考慮。就是當某個服務熔斷之後,服務器將不再被調用此時客戶端可以自己準備一個本地的fallback回調,返回一個缺省值。這樣做,雖然服務水平下降,但好歹可用,比直接掛掉要強。
整體資源快不夠了,忍痛將某些服務先關閉,待度過難關,再開啓回來.例如:
假設銀行有3個窗口A,B,C,每個窗口提供不同的業務,現在A窗口的服務人員,人手不夠急需從C或者B窗口調人處理業務,C或者B窗口掛起暫停服務的牌子
服務降級處理是在客戶端,也就是消費者(調用方)實現完成的,與服務端沒有關係
服務熔斷的做法需要一個方法就需要一個回覆的方法,並且回覆的方法和業務邏輯方法在一起,代碼過於耦合,所以接下來試試這個服務降級的操作:
通用模塊配置
服務降級要配合 feign 調用方式才能使用,降級是在消費者方做的 所以直接修改通用模塊的代碼,先寫一個降級處理類,實現FallbackFactory<StudentClientService>
接口;
package com.cpc.common.service;
import com.cpc.common.entity.Book;
import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @Description: 這是降級處理類
* @Author: cpc
* @Date: 2019-11-22 18:34
* @Version: V1.0
*/
@Component // 不要忘記添加,不要忘記添加,千萬不要忘記 這是一個巨大的坑
public class BookServiceFallbackFactory implements FallbackFactory<BookClientService> {
@Override
public BookClientService create(Throwable throwable) {
//實現BookClientService 這個接口,當調用服務端失敗的時候就走這裏面對應方法的邏輯
return new BookClientService() {
@Override
public Map<String, Object> hystrix() {
Map<String,Object> map=new HashMap<String,Object>();
map.put("code", 500);
map.put("info", "這是在客戶端做服務降級");
return map;
}
@Override
public Book get(Integer id) {
return null;
}
@Override
public List<Book> list() {
return null;
}
@Override
public boolean save(Book book) {
return false;
}
@Override
public boolean delete(Integer id) {
return false;
}
@Override
public String ribbon() {
return null;
}
};
}
}
feign 調用接口:重點是在FeignClient
註解上加了fallbackFactory 這個參數
package com.cpc.common.service;
import com.cpc.common.entity.Book;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
import java.util.Map;
/**
* Book Feign接口客戶端
* @author Administrator
*
*/
// fallbackFactory 是指定降級處理實現類
@FeignClient(value = "MICROSERVICE-BOOK", fallbackFactory = BookServiceFallbackFactory.class)
public interface BookClientService {
/**
* 根據id查詢學生信息
* @param id
* @return
*/
@GetMapping(value="/book/get/{id}")
public Book get(@PathVariable("id") Integer id);
/**
* 查詢學生信息
* @return
*/
@GetMapping(value="/book/list")
public List<Book> list();
/**
* 添加或者修改學生信息
* @param book
* @return
*/
@PostMapping(value="/book/save")
public boolean save(Book book);
/**
* 根據id刪除學生信息
* @return
*/
@GetMapping(value="/book/delete/{id}")
public boolean delete(@PathVariable("id") Integer id);
@RequestMapping("/book/ribbon")
public String ribbon();
/**
* 這是測試服務熔斷的
* @return
*/
@RequestMapping("/book/hystrix")
public Map<String, Object> hystrix();
}
microservice-feign-consumer-feign-80修改(具體的服務調用方)
BookConsumerController
package com.cpc.microservicebookconsumerfeign80.controller;
import com.cpc.common.entity.Book;
import com.cpc.common.service.BookClientService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
import java.util.Map;
@RestController
@RequestMapping("/book")
public class BookConsumerController {
@Autowired
private BookClientService bookClientService;
@PostMapping(value = "/save")
private boolean save(Book book) {
return bookClientService.save(book);
}
@GetMapping(value = "/list")
public List<Book> list() {
return bookClientService.list();
}
@GetMapping(value = "/get/{id}")
public Book get(@PathVariable("id") Integer id) {
return bookClientService.get(id);
}
@GetMapping(value = "/delete/{id}")
public boolean delete(@PathVariable("id") Integer id) {
try {
bookClientService.delete(id);
return true;
} catch (Exception e) {
return false;
}
}
@RequestMapping("/ribbon")
public String ribbon(){
return bookClientService.ribbon();
}
@RequestMapping("/hystrix")
public Map<String, Object> hystrix(){
return bookClientService.hystrix();
}
}
啓動類配置
package com.cpc.microservicebookconsumerfeign80;
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.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.annotation.ComponentScan;
@EnableEurekaClient
@EnableFeignClients(basePackages = {"com.cpc"})
//注意這裏,如果通用模塊包名不同那麼是可能無法將對應的類加入ioc容器,這個配置非常的重要
@ComponentScan(basePackages = {"com.cpc.common.service", "com.cpc.microservicebookconsumerfeign80"})
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class MicroserviceBookConsumerFeign80Application {
public static void main(String[] args) {
SpringApplication.run(MicroserviceBookConsumerFeign80Application.class, args);
}
}
application.yml 中添加如下配置
feign: #feign負載均衡啓動 hystrix
hystrix:
enabled: true
測試
啓動eureka集羣,啓動服務提供者集羣,啓動服務消費者,測試調用 http://localhost/book/hystrix,當服務提供者那邊調用不到,或者超時異常的時候
消費者超時設置
使用Feign調用接口分兩層,ribbon的調用和hystrix的調用,所以ribbon的超時時間和Hystrix的超時時間的結合就是Feign的超時時間
# 這是 ribbon 調用超時時間設置
ribbon:
ReadTimeout: 10000
ConnectTimeout: 9000
#hystrix的超時時間
hystrix:
command:
default:
execution:
timeout:
enabled: true
isolation:
thread:
timeoutInMilliseconds: 9000
一般情況下 都是 ribbon 的超時時間(<)hystrix的超時時間(因爲涉及到ribbon的重試機制)