ryphnyuan commented on issue #722: ServiceComb的调用链默认是对接zipkin的，如何对接jaeger？ URL: https://github.com/apache/incubator-servicecomb-java-chassis/issues/722#issuecomment-403400645 现在是在io.opentracing.contrib.web.servlet.filter.TracingFilter之后，写了个Filter，把当前的span信息写入到httprequest的attribute里面，然后再定义了一个实现了HttpServerFilter的filter，用于在RestServlet将请求丢入线程池后，调用，重新激活父span。这样勉强连起来了。 事实上，io.opentracing.contrib.spring.web.interceptor.TracingHandlerInterceptor这里面的方法并没有运行，这个是在DispatcherServlet里面调用的，RestServlet并不会调用。
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