Hi, I left some comments in this issue[1] Thanks to beiwei for reminding. I forgot that we have some non-netty servers. In this case, I personally prefer all heartbeats to use the same set of mechanisms to guarantee. But we can learn from netty's heartbeat mechanism to ensure more accurate heartbeat control.
[1] https://github.com/apache/incubator-dubbo/issues/3151 Ian Luo <[email protected]> 于2019年1月7日周一 下午1:09写道： > It is an interesting topic. It is worthy to give it a try when Dubbo uses > Netty, but pls. keep in mind that Dubbo has the ability to use other > servers. I am not sure whether this suggestion will introduce unnecessary > complexity. > > JingFeng, would you mind to file an issue and give it a try if you have > time? > > Thanks, > -Ian. > > > On Mon, Jan 7, 2019 at 11:03 AM 徐靖峰 <[email protected]> wrote: > > > Hi all > > > > 现状： > > > > Dubbo > > > 在应用层面发送心跳包保证连接的可用性，使用了定时器的设计，在客户端和服务端分别设置一个定时器，发送心跳，当发现连接断开时，客户端负责重连，服务端负责 > > close。使用定时器并不是一个好的设计，在忙通信时，心跳是不必要的。建议使用 Netty 的 > > IdleStateHandler，仅仅在检测到空闲连接时发送心跳。 > > > > 修改建议： > > > > 使用 IdleStateHandler 代替 Timer 发送心跳 > > 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，几乎没有必要存在，却发出了无必要的 TCP 探测包，仅仅依赖于应用层的心跳来给连接保活即可。 > > For now: > > > > Dubbo sends a heartbeat packet at the application level to ensure the > > availability of the connection. A timer is set on the client and the > server > > to send a heartbeat. When the connection is found to be disconnected, the > > client is responsible for reconnection and the server is responsible for > > close. Using a timer is not a good design, and the heartbeat is > unnecessary > > when communicating busy. It is recommended to use Netty's > IdleStateHandler > > to send a heartbeat only when an idle connection is detected. > > > > Proposed changes: > > > > Send heartbeats using IdleStateHandler instead of Timer > > Close ChannelOption.SO_KEEPALIVE, TCP disconnection at the network level > > needs to be set at the machine level. The default is 2 hours. There is > > almost no need to exist, but an unnecessary TCP probe packet is issued. > It > > only depends on the heartbeat of the application layer to keep the > > connection alive. Just fine. > > > > >
