hystrix dashboard 断路器仪表盘
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hystrix 对请求的降级和熔断,可以产生监控信息,hystrix dashboard可以实时的进行监控
sp07-hystrix 项目添加 actuator,并暴露 hystrix 监控端点
actuator 是 spring boot 提供的服务监控工具,提供了各种监控信息的监控端点
management.endpoints.web.exposure.include
配置选项,
可以指定端点名,来暴露监控端点
如果要暴露所有端点,可以用 “*”
pom.xml 添加 actuator 依赖
右键点击项目或pom.xml, 编辑起步依赖, 添加 actuator 依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
调整 application.yml 配置,并暴露 hystrix.stream
监控端点
spring:
application:
name: hystrix
server:
port: 3001
eureka:
client:
:
defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka
ribbon:
MaxAutoRetriesNextServer: 1
MaxAutoRetries: 1
OkToRetryOnAllOperations: true
hystrix:
command:
default:
execution:
isolation:
thread:
timeoutInMilliseconds: 500
management:
endpoints:
web:
exposure:
include: hystrix.stream
访问 actuator 路径,查看监控端点
http://localhost:3001/actuator
Hystrix dashboard 仪表盘
新建 sp08-hystrix-dashboard 项目
pom.xml
<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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>cn.tedu</groupId>
<artifactId>sp08-hystrix-dashboard</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>sp08-hystrix-dashboard</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.RELEASE</spring-cloud.version>
</properties>
<dependencies>
<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-hystrix-dashboard</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>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
application.yml
spring:
application:
name: hystrix-dashboard
server:
port: 4001
eureka:
client:
:
defaultZone: http://eureka1:2001/eureka, http://eureka2:2002/eureka
主程序添加 @EnableHystrixDashboard
和 @EnableDiscoveryClient
package cn.tedu.sp08;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
public class Sp08HystrixDashboardApplication {
public static void main(String[] args) {
SpringApplication.run(Sp08HystrixDashboardApplication.class, args);
}
}
启动,并访问测试
访问 hystrix dashboard
http://localhost:4001/hystrix
填入 hystrix 的监控端点,开启监控
http://localhost:3001/actuator/hystrix.stream
- 通过 hystrix 访问服务多次,观察监控信息
http://localhost:3001/item-service/35
http://localhost:3001/user-service/7
http://localhost:3001/user-service/7/score?score=100
http://localhost:3001/order-service/123abc
http://localhost:3001/order-service/
hystrix 熔断
整个链路达到一定的阈值,默认情况下,10秒内产生超过20次请求,则符合第一个条件。
满足第一个条件的情况下,如果请求的错误百分比大于阈值,则会打开断路器,默认为50%。
Hystrix的逻辑,先判断是否满足第一个条件,再判断第二个条件,如果两个条件都满足,则会开启断路器
断路器打开 5 秒后,会处于半开状态,会尝试转发请求,如果仍然失败,保持打开状态,如果成功,则关闭断路器
使用 apache 的并发访问测试工具 ab
http://httpd.apache.org/docs/current/platform/windows.html#down
- 用 ab 工具,以并发50次,来发送20000个请求
ab -n 20000 -c 50 http://localhost:3001/item-service/35
- 断路器状态为 Open,所有请求会被短路,直接降级执行 fallback 方法
hystrix 配置
https://github.com/Netflix/Hystrix/wiki/Configuration
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds
请求超时时间,超时后触发失败降级hystrix.command.default.circuitBreaker.requestVolumeThreshold
10秒内请求数量,默认20,如果没有达到该数量,即使请求全部失败,也不会触发断路器打开hystrix.command.default.circuitBreaker.errorThresholdPercentage
失败请求百分比,达到该比例则触发断路器打开hystrix.command.default.circuitBreaker.sleepWindowInMilliseconds
断路器打开多长时间后,再次允许尝试访问(半开),仍失败则继续保持打开状态,如成功访问则关闭断路器,默认 5000
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