[General][Java SDK (Component)] TCP KeepAlive And Customized Heartbeat

[QBH-insist]

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Apache Dubbo Component

Java SDK (apache/dubbo)

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If a customized heartbeat protocol is in place, is it necessary to enable TCP keepalive? I reviewed the Dubbo code and noticed
that NettyClient had keepalive set to true, but NettyServer has is set to false by default.

I think that a customized heartbeat protocol can check the socket for liveness and availability, is it correct?

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[AlbumenJ]

Keepalive in L7 is better than L4

[QBH-insist]

So, When a customized heartbeat mechanism is in place, it is not necessarily required to set keepalive to true.