Netflix feign 启用侦探会降低请求速度（很多）

我在Zipkin服务器上使用SpringCloud伪装和侦察。我的问题是，当我启用Sleuth时，任何简单的请求都至少需要600毫秒。请注意，出于测试目的，我已将Sleuth的采样器百分比设置为1

我能做点什么来改进吗

这里是一个请求的一些日志，不使用Sleuth需要25毫秒，使用Sleuth需要700毫秒。用户呼叫/呼叫/城市的团队：

13:46:46.064 [http-nio-8080-exec-3] DEBUG o.s.c.s.instrument.web.TraceFilter - Received a request to uri [/teams] that should not be sampled [false]
13:46:46.064 [http-nio-8080-exec-3] DEBUG o.s.c.s.instrument.web.TraceFilter - No parent span present - creating a new span
13:46:46.065 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'dispatcherServlet' processing GET request for [/teams]
13:46:46.078 [http-nio-8080-exec-3] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Handling span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.078 [http-nio-8080-exec-3] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a method tag with value [getTeams] to a span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.078 [http-nio-8080-exec-3] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a class tag with value [TeamService] to a span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.083 [hystrix-cities-2] DEBUG o.s.c.s.i.h.SleuthHystrixConcurrencyStrategy$HystrixTraceCallable - Continuing span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.084 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - Created new Feign span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.084 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - The modified request equals GET http://localhost:8080/cities HTTP/1.1
X-B3-ParentSpanId: 99b8ae8aa88157a6
X-B3-Sampled: 1
X-B3-TraceId: 99b8ae8aa88157a6
X-Span-Name: http:/cities
X-B3-SpanId: 4cea0c5e2e662ea3

13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Received a request to uri [/cities] that should not be sampled [false]
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Found a parent span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true] in the request
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Parent span is [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.b.w.f.OrderedRequestContextFilter - Bound request context to thread: org.apache.catalina.connector.RequestFacade@36324069
13:46:46.101 [http-nio-8080-exec-5] DEBUG o.s.web.servlet.DispatcherServlet - DispatcherServlet with name 'dispatcherServlet' processing GET request for [/cities]
13:46:46.105 [http-nio-8080-exec-5] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Handling span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.105 [http-nio-8080-exec-5] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a method tag with value [getCities] to a span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.105 [http-nio-8080-exec-5] DEBUG o.s.c.s.i.w.TraceHandlerInterceptor - Adding a class tag with value [cityService] to a span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.106 [http-nio-8080-exec-5] DEBUG o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor - Written [com.citymanager.entity.City@320dc277] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@33bb3f86]
13:46:46.107 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Trying to send the parent span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true] to Zipkin
13:46:46.107 [http-nio-8080-exec-5] DEBUG o.s.c.s.z.ServerPropertiesEndpointLocator - Span will contain serviceName [city-manager]
13:46:46.109 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - Closing Feign span and logging CR [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.109 [hystrix-cities-2] DEBUG o.s.c.s.i.w.c.feign.TraceFeignClient - Closing Feign span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true]
13:46:46.109 [hystrix-cities-2] DEBUG o.s.c.s.z.ServerPropertiesEndpointLocator - Span will contain serviceName [city-manager]
13:46:46.459 [http-nio-8080-exec-5] DEBUG o.s.c.s.instrument.web.TraceFilter - Closing the span [Trace: 99b8ae8aa88157a6, Span: 4cea0c5e2e662ea3, Parent: 99b8ae8aa88157a6, exportable:true] since the response was successful
13:46:46.464 [hystrix-cities-2] DEBUG o.s.w.c.HttpMessageConverterExtractor - Reading [class com.citymanager.entity.City] as "application/json;charset=UTF-8" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@33bb3f86]
13:46:46.465 [hystrix-cities-2] DEBUG o.s.c.s.i.h.SleuthHystrixConcurrencyStrategy$HystrixTraceCallable - Detaching span since it was continued [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true]
13:46:46.466 [http-nio-8080-exec-3] DEBUG o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor - Written [com.citymanager.entity.Team@3c35ed9b] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@33bb3f86]
13:46:46.466 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.DispatcherServlet - Successfully completed request
13:46:46.467 [http-nio-8080-exec-3] DEBUG o.s.c.s.instrument.web.TraceFilter - Closing the span [Trace: 99b8ae8aa88157a6, Span: 99b8ae8aa88157a6, Parent: null, exportable:true] since the response was successful
13:46:46.467 [http-nio-8080-exec-3] DEBUG o.s.c.s.z.ServerPropertiesEndpointLocator - Span will contain serviceName [city-manager]
13:46:46.857 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - Created POST request for "http://localhost:9411/api/v1/spans"
13:46:46.857 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - Setting request Accept header to [text/plain, application/json, application/*+json, */*]
13:46:46.857 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - Writing [[B@1aecb2f4] as "application/json" using [org.springframework.http.converter.ByteArrayHttpMessageConverter@4414cc2d]
13:46:46.885 [AsyncReporter(org.springframework.cloud.sleuth.zipkin.RestTemplateSender@42519b72)] DEBUG o.s.web.client.RestTemplate - POST request for "http://localhost:9411/api/v1/spans" resulted in 202 (null)

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好像你在用。你可以试试这种方法。我自己还没有做过基准测试，但理论上应该可以提高性能

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请参阅以下文档：

我想知道您选择了哪种基准测试方法。你使用的是哪个版本的侦探？这也是你正在做的一个基准测试吗？它在你的电脑上吗？JVM被加热了吗？是否执行了其他流程？做基准测试并不是那么容易。。。您可以使用像JMH这样的工具来做得更好

顺便说一句，请尝试关闭调试日志记录级别并再次检查结果

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我们正在对Sleuth进行基准测试，从我们在添加Sleuth时看到的情况来看，延迟增加了约20毫秒。绝对不是600毫秒。

我相信您遇到了以下问题：org.springframework.cloud.Sleuth.zipkin.ServerPropertiesEndpointLocator

它使用InetUtils.findFirstNonLoopbackAddress确定实例地址。在ZipkinPanListenerConvert中，当每个跨度关闭时，同步调用方法。解决方法是创建自定义org.springframework.cloud.sleuth.zipkin.EndpointLocator。您可以使用类似的方法：

class CachingEndpointLocator implements EndpointLocator {

    private final Endpoint endpoint;

    CachingEndpointLocator(EndpointLocator delegate) {
      this.endpoint = delegate.local();
    }

    @Override
    public Endpoint local() {
      return endpoint;
    }
  }

并将其与一个现有端点定位器组合。您可以在org.springframework.cloud.sleuth.zipkin.ZipkinAutoConfiguration中找到它们

此问题已在sleuth 2.X.X中修复。其中：org.springframework.cloud.sleuth.zipkin2.DefaultEndpointLocator缓存服务器地址：

    public DefaultEndpointLocator(Registration registration,
            ServerProperties serverProperties, Environment environment,
            ZipkinProperties zipkinProperties, InetUtils inetUtils) {
        this.registration = registration;
        this.serverProperties = serverProperties;
        this.environment = environment;
        this.zipkinProperties = zipkinProperties;
        this.firstNonLoopbackAddress = findFirstNonLoopbackAddress(inetUtils);
    }

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Thx，我要试试！我在启用了sleuth的情况下调用第一个入口点一千次，然后在相同条件下不启用sleuth：使用x30因子，这种方法就足够了。我使用SpringCloudSleuth1.2.0，并且禁用了调试。服务器与生产服务器相同。你的基准测试真的很有趣：你使用HTTP还是流？我能说什么呢，我们的值与我们进行基准测试时的值不同。你可以把你的示例发布到某个地方，我可以试着检查一下。你可以在侦探项目中提出这个问题，这样我就不会忘记了