[I] [E1008]Reached timeout=10000ms (brpc)

[via GitHub]

clee01 opened a new issue, #2686:
URL: https://github.com/apache/brpc/issues/2686

   **Describe the bug (描述bug)**
   brpc客户端在连接空闲了一段时间后，大约1.5h，再次请求发现会会报这样的错误 `[E1008]Reached 
timeout=10000ms`，大约再过了15分钟后，问题不再出现。
   
   **To Reproduce (复现方法)**
   brpc客户端在连接空闲了一段时间后，大约1.5h，再次请求发现会会报这样的错误 `[E1008]Reached timeout=10000ms`
   
   **Expected behavior (期望行为)**
   正常请求，不报E1008错误
   
   **Versions (各种版本)**
   OS: centos7.9
   Compiler: gcc 9.3.1
   brpc: -
   protobuf: -
   
   **Additional context/screenshots (更多上下文/截图)**
   ``` cpp
   Client::Client() {
     auto config = ConfigManager::GetConfigManager();
   
     brpc::ChannelOptions options;
   
     options.protocol = config->GetConfigParam<std::string>(
         "risk_control", "protocol", "baidu_std");
     options.connection_type = config->GetConfigParam<std::string>(
         "risk_control", "connection_type", "");
     options.timeout_ms =
         config->GetConfigParam<int>("risk_control", "timeout_ms", "100");
     options.max_retry =
         config->GetConfigParam<int>("risk_control", "max_retry", "3");
   
     const std::string server = config->GetConfigParam<std::string>(
         "risk_control", "server", "0.0.0.0:8000");
     const std::string load_balancer =
         config->GetConfigParam<std::string>("risk_control", "load_balancer", 
"");
   
     if (channel_.Init(server.c_str(), load_balancer.c_str(), &options) != 0) {
       SLOG_ERROR("", "RiskControl", "Client Init failed", 0, 0);
     }
     stub_.reset(new rc::AsyncRcService_Stub(&channel_));
   }
   ```
   初步分析了下，应该是tcp连接假死导致应用层没有感知到，触发了TCP的超时重传。
   
   但是有一个疑问就是tcp连接为啥会假死呢，通过`lsof`命令查看客户端和服务端的TCP连接都是`established`的状态
   


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