[I] Client端latency_us远超过timeout (brpc)

[via GitHub]

duishuhaoqi opened a new issue, #2485:
URL: https://github.com/apache/brpc/issues/2485

   **Describe the bug (描述bug)**
   查询持续请求存储节点，返回超时报错：
   
![image](https://github.com/apache/brpc/assets/50567662/57af856d-de21-4260-9ed5-954d4261d619)
   设置的timeout为115ms，但是统计的timeCostUs_(即latency_us)已经达到5s；
   后面持续返回timeout，且latency_us越来越大，甚至达到20s
   
   对于client端，latency_us包括哪些时间？有办法统计到内部各个阶段的时间吗（例如在接收队列排队时间）？
   
   **To Reproduce (复现方法)**
   只在某个机器上能复现出来，换了台机器就不会出现
   
   **Expected behavior (期望行为)**
   应该超时时立即返回？
   **Versions (各种版本)**
   OS:
   Compiler:gcc (GCC) 9.2.1 20200522 (Alibaba 9.2.1-3 2.17)
   brpc:
   protobuf:
   
   **Additional context/screenshots (更多上下文/截图)**
   
   


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