Initially this was requested for monitoring and audit of the server, for example, to send a UDP packet to a statistics server on every connect/dicsonnect, or simply once in every few seconds.
But there are other very interesting uses:
- proxying - a replica can automatically proxy an update request to the master server,
- custom client-server protocols.
Apparently the lack of network I/O in traditional databases is a restriction of a secure client/server operation model. Once you’re not worried as much about security, this becomes a very interesting addition. I’m sure we’ll learn about all the drawbacks of the approach in the coming months :)