Default shutdownQuietPeriod should be 0 or some fraction of the shutdownTimeout

[seabamirum]

In DefaultLettuceClientConfiguration, the shutdownQuietPeriod is set as follows

this.shutdownQuietPeriod = shutdownQuietPeriod != null ? shutdownQuietPeriod : shutdownTimeout;

This effectively makes it so that clients who do not set this parameter in their LettuceClientConfiguration builder are forced to wait for the entire shutdownTimeout period before shutting down.

Proposed Solution
Modify the default value of shutdownQuietPeriod to be 0 or a fraction of the shutdownTimeout (e.g., 10% of shutdownTimeout). This change will ensure that the shutdown process is initiated promptly without waiting for the entire shutdownTimeout period.

[mp911de]

Shutdown timeouts are here to protect your application in a best-effort basis during shutdown. If your application shuts down cleanly without lagging Redis I/O during the shutdown, then you can set the timeouts to zero.

Shutdown timeouts have been a constant back and forth to find the ideal balance, shutdownQuietPeriod specifically was introduced with version 2.2 whereas LettuceClientConfiguration was added with version 2.0.

With Spring Data Redis introducing custom timeouts anyway, we could default the value to zero.

[seabamirum]

Thanks, I think that would be a good improvement. Until I found the shutdownQuietPeriod parameter, it took me a while to figure out why increasing shutdownTimeout only ended up increasing the actual shutdown time by the same amount. I had assumed there were active processes, etc. but this occurred even on an idle server.