[GitHub] [incubator-brpc] zyearn commented on issue #1895: Support TCP heartbeat to support the case that brpc client unaware of servers' down

[GitBox <gi...@apache.org>]

zyearn commented on issue #1895:
URL: https://github.com/apache/incubator-brpc/issues/1895#issuecomment-1221378212

   > 可以通过给客户端socket设置SO_KEEPALIVE参数来实现。开启keepalive操作系统会来探活然后关闭已经断开的socket。
   > 
   > ```c++
   >     if (setsockopt(client_fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)) < 0) {
   >        ...
   >     }
   > ```
   > 
   > 对代码侵入性比较小。另外可以把把TCP_KEEPIDLE、TCP_KEEPINTVL、TCP_KEEPCNT三个socket选项的值提供给Channel设置。 让用户自定义探活动时间
   > 
   > ```c++
   >     if (setsockopt(client_fd, IPPROTO_TCP, TCP_KEEPIDLE, &val1, sizeof(val1)) < 0) {
   >         ... 
   >     }
   >     if (setsockopt(cliend_fd, IPPROTO_TCP, TCP_KEEPINTVL, &val2, sizeof(val2)) < 0) {
   >         ...
   >     }
   >     if (setsockopt(, IPPROTO_TCP, TCP_KEEPCNT, &val3, sizeof(val3)) < 0) {
   >         ...
   >     }
   > ```
   > 
   > 不设置的时候会走系统中对应的配置：
   > 
   > ```shell
   > cat /proc/sys/net/ipv4/tcp_keepalive_time
   > 7200
   > 
   > cat /proc/sys/net/ipv4/tcp_keepalive_intvl
   > 75
   > 
   > cat /proc/sys/net/ipv4/tcp_keepalive_probes
   > 9
   > ```
   > 
   > 2个小时以后会被操作系统关闭。
   
   嗯是这个思路。


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