feifeiiong opened a new issue #1010: 异步情况下的span传递问题 URL: https://github.com/apache/incubator-brpc/issues/1010 **Describe the bug (描述bug)** 关于异步情况下 clientSpan的cr时间问题,对应span中的字段为：_received_real_us 观察到这个字段是在收包阶段设置。若brpc作为proxy，接收上游请求，之后发起异步调用，这时Server Controller会被销毁，由此调用Span的submit方法，此种情况下，异步调用的clientSpan会跟随ServerSpan一同销毁，由此会出现cr=0的情况。 Span销毁后，只是调用ReturnToObject丢回对象池，异步回调结束后，仍然可以拿到ParentSpan的指针，同事client Controller事实上仍然是持有 client Span的指针的，这里设计是否存在问题？ **To Reproduce (复现方法)** 异步调用，一段时间后返回，cr时间为0. **Expected behavior (期望行为)** clientSpan的销毁时机，应该在异步调用返回之后。 **Versions (各种版本)** OS: Compiler: brpc: protobuf: **Additional context/screenshots (更多上下文/截图)**
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