In 23.08, 23.02, 22.08:
In 6, 2.5, 2.4:
Requires that the Primary Server have at least one Replica Server.
This module parameter specifies whether the Primary Server requires a connection to a Replica Server. The Replica Server must not be behind a relay, but can be attempting to replicate or be replicating from the Primary Server. If the Replica Server is down, the last successful result is used instead. Enabling it sets
connecting_slave on the master_