```
if ((lastRead != null && now() - lastRead > heartbeat)
|| (lastWrite != null && now() - lastWrite > heartbeat)) {
```
目前在忙通讯的时候确实没有发送心跳包。只是定时检查，不一定定时发送。
> 关闭 ChannelOption.SO_KEEPALIVE，网络层面的 TCP 断连需要在机器级别设置，默认是 2 小时
同意。但是优化空间不大，聊胜于无。
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/3151 ]
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