服务短路(CircuitBreaker)

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QPS：Query Per Second

TPS：Transaction Per Second

QPS：经过全链路压测，计算单机极限QPS，集群QPS=单机PQS*集群机器数量*可靠性比率

全链路压测，除了压极限QPS，还有错误数量

全链路：一个完整的业务流程操作

JMeter：可调整型比较灵活

Spring Cloud Hystrix Client

官网：https://github.com/Netflix/Hystrix

Reactive Java框架：

java9 Flow API

Reactor

RxJava(Reactive X)

激活Hystrix

通过@EnableHystrix激活

配置信息wiki：https//github.com/Netflix/Hystrix/wiki/Configuration

Hystrix

1. 注解方式

@HystrixCommand(defaultFallback= "errorContent",commandProperties =

{@HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value= "100")})

@GetMapping("/user/count")

public String userCount() throws InterruptedException {

Random random = new Random();

int nextInt = random.nextInt(200);

System.out.println("random time > "+nextInt);

Thread.sleep(nextInt);

return userService.userCount();

}

public String errorContent() {

System.out.println("超时了");

return "-1";

}

2. 编程方式

@GetMapping("/user/count2")

public String userCount2() {

return new MyHystrixCommand().execute();

}

private class MyHystrixCommand extends com.netflix.hystrix.HystrixCommand{

protected MyHystrixCommand() {

super(HystrixCommandGroupKey.Factory.asKey(""), 100);

}

@Override

protected String run() throws Exception {

Random random = new Random();

int nextInt = random.nextInt(200);

System.out.println("random time > "+nextInt);

Thread.sleep(nextInt);

return "OK";

}

@Override

protected String getFallback() {

return UserServiceProviderRestApiController.this.errorContent();

}

}

对比其他Java执行方式：

Feature

public class FutrueDemo {

public static void main(String[] args) {

Random random = new Random();

ExecutorService service = Executors.newFixedThreadPool(1);

Future futrue = service.submit(() -> {

int value = random.nextInt(200);

System.out.print("睡眠"+value+"ms.");

Thread.sleep(value);

return "OK";

});

try {

futrue.get(100,TimeUnit.MILLISECONDS);

}catch (Exception e) {

System.out.println("超时保护...");

}

service.shutdown();

}

}

Health Endpoint (/actuator/health)

{

"status": "UP",

"details": {

"diskSpace": {

"status": "UP",

"details": {

"total": 140382552064,

"free": 7376781312,

"threshold": 10485760

}

},

"refreshScope": {

"status": "UP"

},

"discoveryComposite": {

"status": "UP",

"details": {

"discoveryClient": {

"status": "UP",

"details": {

"services": ["user-service-consumer", "user-service-provider", "eureka-server"]

}

},

"eureka": {

"description": "Remote status from Eureka server",

"status": "UP",

"details": {

"applications": {

"USER-SERVICE-CONSUMER": 1,

"EUREKA-SERVER": 2,

"USER-SERVICE-PROVIDER": 2

}

}

}

}

},

"hystrix": {

"status": "UP"

}

}

}

激活熔断保护 无锡妇科医院排行 http://www.0510bhyy.com/

@EnableCircuitBreaker 激活：@EnableHystrix + Spring Cloud功能

@EnableHystrix 激活，没有一些Spring Cloud功能，如 /hystrix.stream

hystrix Endpoint(/actuator/hystrix.stream)

data: {

"type": "HystrixCommand",

"name": "MyHystrixCommand",

"group": "",

"currentTime": 1563720628038,

"isCircuitBreakerOpen": false,

"errorPercentage": 50,

"errorCount": 2,

"requestCount": 4,

"rollingCountBadRequests": 0,

"rollingCountCollapsedRequests": 0,

"rollingCountEmit": 0,

"rollingCountExceptionsThrown": 0,

"rollingCountFailure": 0,

"rollingCountFallbackEmit": 0,

"rollingCountFallbackFailure": 0,

"rollingCountFallbackMissing": 0,

"rollingCountFallbackRejection": 0,

"rollingCountFallbackSuccess": 1,

"rollingCountResponsesFromCache": 0,

"rollingCountSemaphoreRejected": 0,

"rollingCountShortCircuited": 0,

"rollingCountSuccess": 2,

"rollingCountThreadPoolRejected": 0,

"rollingCountTimeout": 1,

"currentConcurrentExecutionCount": 0,

"rollingMaxConcurrentExecutionCount": 1,

"latencyExecute_mean": 0,

"latencyExecute": {

"0": 0,

"25": 0,

"50": 0,

"75": 0,

"90": 0,

"95": 0,

"99": 0,

"99.5": 0,

"100": 0

},

"latencyTotal_mean": 0,

"latencyTotal": {

"0": 0,

"25": 0,

"50": 0,

"75": 0,

"90": 0,

"95": 0,

"99": 0,

"99.5": 0,

"100": 0

},

"propertyValue_circuitBreakerRequestVolumeThreshold": 20,

"propertyValue_circuitBreakerSleepWindowInMilliseconds": 5000,

"propertyValue_circuitBreakerErrorThresholdPercentage": 50,

"propertyValue_circuitBreakerForceOpen": false,

"propertyValue_circuitBreakerForceClosed": false,

"propertyValue_circuitBreakerEnabled": true,

"propertyValue_executionIsolationStrategy": "THREAD",

"propertyValue_executionIsolationThreadTimeoutInMilliseconds": 100,

"propertyValue_executionTimeoutInMilliseconds": 100,

"propertyValue_executionIsolationThreadInterruptOnTimeout": true,

"propertyValue_executionIsolationThreadPoolKeyOverride": null,

"propertyValue_executionIsolationSemaphoreMaxConcurrentRequests": 10,

"propertyValue_fallbackIsolationSemaphoreMaxConcurrentRequests": 10,

"propertyValue_metricsRollingStatisticalWindowInMilliseconds": 10000,

"propertyValue_requestCacheEnabled": true,

"propertyValue_requestLogEnabled": true,

"reportingHosts": 1,

"threadPool": ""

}

Spring Cloud Hystrix Dashboard

使用@EnableHystrixDashboard激活

@SpringBootApplication

@EnableHystrixDashboard

public class SpringCloudHystrixDashboardApplication {

public static void main(String[] args) {

SpringApplication.run(SpringCloudHystrixDashboardApplication.class, args);

}

}

网站栏目：SpringCloud关于：SpringCloudNetflixHystrix
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