redis application level keep alive

[chenjuq126]

Feature Request

Lettuce cannot recover from connection problems. The problem is fixed.

My condition differs from it a little: a socks proxy add between client and redis.
lettuce <--> socks proxy A <--> redis server
lettuce <--> socks proxy B <--> redis server

Is there any application feature for client to detect server alive or reachable? Because, SocketOptions and EpollChannelOption.TCP_KEEPINTVL works on TCP layer.
1 if there is a TCP socks proxy between lettuce and redis server；
2 the TCP keep-alive data packet can not be transferred to redis server；
3 if socks proxy A can not reach redis server temporary eg. 20 minutes.
on the 3 items above, clients connected with A can not know whether the server is reachable in a short time, if only depends on TCP keep-alive. setget, pubsub, and lock can not work.

Is your feature request related to a problem? Please describe

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Describe the solution you'd like

Application level keep alive configuration.

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Describe alternatives you've considered

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Teachability, Documentation, Adoption, Migration Strategy

If you can, explain how users will be able to use this and possibly write out a version the docs.
Maybe a screenshot or design?

[mp911de]

if socks proxy A can not reach redis server temporary eg. 20 minutes.

Then your proxy server should disconnect the connection. Otherwise, we're trying to work around a very specific scenario.

[neioWHU]

Can lettuce consider introducing the testonborrow mechanism?

[mp911de]

ConnectionPoolSupport is a very thin layer on top of Apache Commons Pool 2. The object validation uses a check based on whether the socket is connected. If we would use e.g. PING and a blocking command is ongoing, we would easily cause a situation where validation isn't working for everyone.

You can easily provide such a wrapper in your own code.