spring-boot - spring cloud、hystrix、feign如何集成opentracing/jaeger？

Question

我们最近设置了一个 jaeger 服务器，以便跟踪整个系统中的所有请求。通过简单地将必要的 spring (cloud) starter 依赖项添加到我们的构建文件中，初始设置工作得非常好。每次请求到达我们的一台服务器时，都会创建一个新跨度并将其报告给使用一体式 docker 镜像设置的 jaeger 服务器。

最重要的依赖项如下:

compile "org.springframework.boot:spring-boot-starter-web"
compile "org.springframework.boot:spring-boot-starter-actuator"
compile "org.springframework.boot:spring-boot-starter-undertow"
compile "org.springframework.boot:spring-boot-starter-aop"

compile "org.springframework.cloud:spring-cloud-starter-netflix-hystrix:2.0.2.RELEASE"
compile "org.springframework.cloud:spring-cloud-starter-openfeign:2.0.2.RELEASE"

compile "io.opentracing.contrib:opentracing-spring-cloud-feign-starter:0.2.1"
compile "io.opentracing.contrib:opentracing-spring-jaeger-cloud-starter:0.2.1"
compile "io.opentracing.contrib:opentracing-spring-jaeger-starter:0.2.1"
compile "io.opentracing.contrib:opentracing-spring-web-autoconfigure:0.2.1"

虽然在服务器上创建了跨度，但不会将必要的 header 转发给假客户端。根据文档，添加 opentracing-spring-cloud-feign-starter 依赖项应该可以解决问题，但到目前为止，没有一个 feign 客户端起作用。

我还在opentracing提供的auto configure类中加了一个断点

@Bean
FeignContextBeanPostProcessor feignContextBeanPostProcessor(BeanFactory beanFactory) {
    return new FeignContextBeanPostProcessor(tracer, beanFactory, spanDecorators);
}

并且在应用程序启动时调用此方法。日志中还有一些关于 jaeger/opentracing 初始化的信息:

main 22:26:53.371 3222 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'io.opentracing.contrib.spring.cloud.async.DefaultAsyncAutoConfiguration$DefaultTracedAsyncConfigurerSupport' of type [io.opentracing.contrib.spring.cloud.async.DefaultAsyncAutoConfiguration$DefaultTracedAsyncConfigurerSupport$$EnhancerBySpringCGLIB$$4ab0858a] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:53.478 3329 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'io.opentracing.contrib.spring.cloud.async.DefaultAsyncAutoConfiguration' of type [io.opentracing.contrib.spring.cloud.async.DefaultAsyncAutoConfiguration$$EnhancerBySpringCGLIB$$4bce5627] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:53.670 3521 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'io.opentracing.contrib.spring.cloud.feign.FeignTracingAutoConfiguration' of type [io.opentracing.contrib.spring.cloud.feign.FeignTracingAutoConfiguration$$EnhancerBySpringCGLIB$$3a2361a6] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:53.905 3756 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'io.opentracing.contrib.java.spring.jaeger.starter.JaegerAutoConfiguration' of type [io.opentracing.contrib.java.spring.jaeger.starter.JaegerAutoConfiguration$$EnhancerBySpringCGLIB$$5c956416] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:53.942 3793 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'opentracing.jaeger-io.opentracing.contrib.java.spring.jaeger.starter.JaegerConfigurationProperties' of type [io.opentracing.contrib.java.spring.jaeger.starter.JaegerConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:53.962 3813 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'metricsFactory' of type [io.jaegertracing.internal.metrics.NoopMetricsFactory] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:53.977 3828 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'reporterMetrics' of type [io.jaegertracing.internal.metrics.Metrics] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:53.982 3833 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'sampler' of type [io.jaegertracing.internal.samplers.ConstSampler] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:54.013 3864 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'reporter' of type [io.jaegertracing.internal.reporters.CompositeReporter] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:54.028 3879 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'tracer' of type [io.jaegertracing.internal.JaegerTracer] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
main 22:26:59.495 9346 INFO  o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$216245cc] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

我花了很多时间阅读文档并寻找如何正确配置 spring boot/cloud 应用程序以便与假客户端一起工作的示例，但到目前为止我没有运气。大多数示例都使用 Springs 的 RestTemplate 而不是 Feign 客户端。

如果有人能指出我正确的方向，我会很高兴。

Answer 1

事实证明，Feign 客户端当前不支持，或者准确地说，spring 启动不会相应地配置 Feign 客户端。如果您想将 Jaeger 与您的 Feign 客户端一起使用，您必须提供自己的集成。

根据我目前的经验，jaeger 社区的支持度较低，因此您必须自己获得此类知识，我认为这是一个很大的缺点，您可能应该考虑使用替代方案。