Not strictly so - we don't *need* to send the redirect information in
the middle of the session. The session can just be dropped, and when
clients automatically reconnect they will get the error message (if
old client software) or do an automatic redirect to the new server (if
https://github.com/MariaDB/server/pull/2681 is merged).
Hi Otto,
Automatic reconnect is disabled by default, so applications would just stop unless the reconnect option was enabled or they execute reconnect.
(MySQL 8.1 already deprecated automatic reconnect).
/Georg