Spring-引导-启动-执行器与Hystrix-伺服-度量-发布器冲突

Question

我使用Spring-Boot1.4.3.与Netflix Hystrix一起发布，我将通过JMX提供Hystrix度量。Hystrix由此片段包含在project中

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-dependencies</artifactId>
      <version>Brixton.SR5</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

对于通过JMX的度量，我使用hystrix-s伺服-metrics-publisher1.5.9

<dependency>
  <groupId>com.netflix.hystrix</groupId>
  <artifactId>hystrix-servo-metrics-publisher</artifactId>
  <version>1.5.9</version>
</dependency>

Hystrix-sero-metrics-publisher易于使用。只需为静态块提供一行HystrixPlugins.getInstance（）.RegisterMetricSpublisher(HystrixServometricSpublisher.getInstance（））；就足够了，如下所示

@EnableCircuitBreaker
@SpringBootApplication
public class ExampleApplication extends SpringBootServletInitializer {
  static {
    HystrixPlugins.getInstance().registerMetricsPublisher(HystrixServoMetricsPublisher.getInstance());
  }

  @Override
  protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(ExampleApplication.class);
  }

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

它工作得很漂亮。

但我们也需要在我们的项目Spring引导执行器。添加依赖项后

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

Hystrix-伺服度量发布器不再工作了。在JMX MBeans/Attributes上没有com.netlix.source包。

下面是一个具有禁用的Spring-Boot-Starter-Actutor依赖项的小示例项目：hystrix-souro-metrics-publisher-jmx-example

Answer 1

更新：我注意到您在示例项目中使用的是Spring Boot1.4.3，而您的项目设置是不正确的。Spring Boot 2.0.x的情况有所不同，请参见下文。

示例项目设置的问题

您使用的是hystrix-sero-metrics-publisher版本1.5.9。此版本与Spring Cloudbrixton.sr5使用的Hystrix版本1.5.3不兼容。通过启动应用程序，调用http://localhost:8080/RemoteCall（创建初始Hystrix度量），然后调用http://localhost:8080/metrics（访问执行器endpoint），可以观察到不兼容性。然后得到一个java.lang.nosuchmethoderror：com.netflix.hystrix.hystrixThreadPoolProperties.maximumSize（）lcom/netflix/hystrix/strategy/properties/hystrixProperty；。将版本设置为1.5.3可解决此问题。

Spring Boot 1.x解决方案

JMX度量在执行器中不再可见的原因是ServometricSautoConfiguration引起的，如果使用Spring Boot执行器，它将被激活。这里公开了一个监视器注册表bean，其配置依赖于SpringMetricsConfigBean。新的默认注册表类是basicMonitorRegistry。

若要取回原始的默认JMX监视器注册表，请添加一个resources/application.properties，其行为netflix.metrics.servo.registryclass=com.netflix.servo.JMX.jmxMonitorRegistry。这样，通过JMX和Spring Actuctor metricsendpoint来公开度量。

Spring Boot 2.0.x解决方案

对于Spring Boot2，问题是不同的。我将问题追踪到io.micrometer.core.instrument.binder.hystrix.hystrixmetricsbinder(micrometer是spring-boot-acture-autocigure的依赖项）。在这里，当触发MetricSautoConfiguration类时，任何现有的发布服务器都被MicroMeterMetricSpublisher替换。因此，HystrixPlugins.getInstance（）.RegisterMetricSpublisher(HystrixServometricSpublisher.getInstance（））；语句不具有所需的效果。发布者被简单地丢弃...

Hystrix插件的问题是每个插件类型一次只能注册一个插件。因此，一个解决方案是用委托给多个插件实例的“元”插件替换现有的插件。在HystrixSecurityAutoConfiguration中也使用了这种方法。使用下面的config类，我设法通过JMX和Spring Boot执行器（例如/acture/metrics/Hystrix.execution）公开了Hystrix度量：

import com.netflix.hystrix.*;
import com.netflix.hystrix.contrib.servopublisher.HystrixServoMetricsPublisher;
import com.netflix.hystrix.strategy.HystrixPlugins;
import com.netflix.hystrix.strategy.concurrency.HystrixConcurrencyStrategy;
import com.netflix.hystrix.strategy.eventnotifier.HystrixEventNotifier;
import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherCollapser;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherCommand;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherThreadPool;
import com.netflix.hystrix.strategy.properties.HystrixPropertiesStrategy;
import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;

@Configuration
@ConditionalOnClass({Hystrix.class, HystrixServoMetricsPublisher.class})
@AutoConfigureAfter(MetricsAutoConfiguration.class)
public class HystrixServoAndMicrometerConfig {

    @PostConstruct
    public void init() {
        // Keeps references of existing Hystrix plugins
        HystrixMetricsPublisher existingMetricsPublisher = HystrixPlugins.getInstance().getMetricsPublisher();
        HystrixConcurrencyStrategy concurrencyStrategy = HystrixPlugins.getInstance().getConcurrencyStrategy();
        HystrixEventNotifier eventNotifier = HystrixPlugins.getInstance().getEventNotifier();
        HystrixPropertiesStrategy propertiesStrategy = HystrixPlugins.getInstance().getPropertiesStrategy();
        HystrixCommandExecutionHook commandExecutionHook = HystrixPlugins.getInstance().getCommandExecutionHook();

        if (existingMetricsPublisher != null) {
            HystrixPlugins.reset();
            // Registers existing plugins except the new ServoAndExistingMetricsPublisher plugin
            HystrixPlugins.getInstance().registerMetricsPublisher(new ServoAndExistingMetricsPublisher(
                    existingMetricsPublisher, HystrixServoMetricsPublisher.getInstance()));
            HystrixPlugins.getInstance().registerConcurrencyStrategy(concurrencyStrategy);
            HystrixPlugins.getInstance().registerEventNotifier(eventNotifier);
            HystrixPlugins.getInstance().registerPropertiesStrategy(propertiesStrategy);
            HystrixPlugins.getInstance().registerCommandExecutionHook(commandExecutionHook);
        } else {
            HystrixPlugins.getInstance().registerMetricsPublisher(HystrixServoMetricsPublisher.getInstance());
        }
    }

    private static class ServoAndExistingMetricsPublisher extends HystrixMetricsPublisher {

        private static class ServoAndOtherMetricsPublisherCommand implements HystrixMetricsPublisherCommand {
            private final HystrixMetricsPublisherCommand servoMetricsPublisherCommand;
            private final HystrixMetricsPublisherCommand existingMetricsPublisherCommand;

            ServoAndOtherMetricsPublisherCommand(HystrixMetricsPublisherCommand servoMetricsPublisherCommand,
                                                 HystrixMetricsPublisherCommand existingMetricsPublisherCommand) {
                this.servoMetricsPublisherCommand = servoMetricsPublisherCommand;
                this.existingMetricsPublisherCommand = existingMetricsPublisherCommand;
            }

            @Override
            public void initialize() {
                servoMetricsPublisherCommand.initialize();
                existingMetricsPublisherCommand.initialize();
            }
        }

        private final HystrixMetricsPublisher existingMetricsPublisher;
        private final HystrixMetricsPublisher servoMetricsPublisher;

        ServoAndExistingMetricsPublisher(HystrixMetricsPublisher existingMetricsPublisher,
                                         HystrixMetricsPublisher servoMetricsPublisher) {
            this.existingMetricsPublisher = existingMetricsPublisher;
            this.servoMetricsPublisher = servoMetricsPublisher;
        }

        @Override
        public HystrixMetricsPublisherCommand getMetricsPublisherForCommand(HystrixCommandKey commandKey, HystrixCommandGroupKey commandGroupKey, HystrixCommandMetrics metrics, HystrixCircuitBreaker circuitBreaker, HystrixCommandProperties properties) {
            HystrixMetricsPublisherCommand servoMetricsPublisherCommand = servoMetricsPublisher.getMetricsPublisherForCommand(commandKey, commandGroupKey, metrics, circuitBreaker, properties);
            HystrixMetricsPublisherCommand existingMetricsPublisherCommand = existingMetricsPublisher.getMetricsPublisherForCommand(commandKey, commandGroupKey, metrics, circuitBreaker, properties);
            return new ServoAndOtherMetricsPublisherCommand(servoMetricsPublisherCommand, existingMetricsPublisherCommand);
        }

        @Override
        public HystrixMetricsPublisherThreadPool getMetricsPublisherForThreadPool(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolMetrics metrics, HystrixThreadPoolProperties properties) {
            return servoMetricsPublisher.getMetricsPublisherForThreadPool(threadPoolKey, metrics, properties);
        }

        @Override
        public HystrixMetricsPublisherCollapser getMetricsPublisherForCollapser(HystrixCollapserKey collapserKey, HystrixCollapserMetrics metrics, HystrixCollapserProperties properties) {
            return servoMetricsPublisher.getMetricsPublisherForCollapser(collapserKey, metrics, properties);
        }
    }
}