The terms master and slave have historically been used in replication, but the terms terms primary and replica are now preferred. The old terms are used still used in parts of the documentation, and in MariaDB commands, although MariaDB 10.5 has begun the process of renaming. The documentation process is ongoing. See MDEV-18777 to follow progress on this effort.
RESET REPLICA ["connection_name"] [ALL] [FOR CHANNEL "connection_name"] -- from MariaDB 10.5.1 RESET SLAVE ["connection_name"] [ALL] [FOR CHANNEL "connection_name"]
RESET REPLICA/SLAVE makes the replica forget its replication position in the master's binary log. This statement is meant to be used for a clean start. It deletes the master.info and relay-log.info files, all the relay log files, and starts a new relay log file. To use RESET REPLICA/SLAVE, the replica threads must be stopped (use STOP REPLICA/SLAVE if necessary).
Note: All relay log files are deleted, even if they have not been completely executed by the slave SQL thread. (This is a condition likely to exist on a replication slave if you have issued a STOP REPLICA/SLAVE statement or if the slave is highly loaded.)
RESET REPLICA does not reset the global
gtid_slave_pos variable. This means that a replica
server configured with
CHANGE MASTER TO MASTER_USE_GTID=slave_pos
will not receive events with GTIDs occurring before the state saved in
gtid_slave_pos. If the intent is to reprocess these events,
gtid_slave_pos must be manually reset, e.g. by executing
set global gtid_slave_pos="".
Connection information stored in the master.info file is immediately reset using any values specified in the corresponding startup options. This information includes values such as master host, master port, master user, and master password. If the replica SQL thread was in the middle of replicating temporary tables when it was stopped, and RESET REPLICA/SLAVE is issued, these replicated temporary tables are deleted on the slave.
ALL also resets the
PASSWORD parameters for the slave. If you are using a connection name, it will permanently delete it and it will not show up anymore in SHOW ALL REPLICAS/SLAVE STATUS.
connection_name option is used for multi-source replication.
If there is only one nameless primary, or the default primary (as specified by the default_master_connection system variable) is intended,
connection_name can be omitted. If provided, the
RESET REPLICA/SLAVE statement will apply to the specified primary.
connection_name is case-insensitive.
MariaDB starting with 10.7.0
FOR CHANNEL keyword was added for MySQL compatibility. This is identical as
using the channel_name directly after
MariaDB starting with 10.5.1
RESET REPLICA is an alias for
RESET SLAVE from MariaDB 10.5.1.
- STOP REPLICA/SLAVE stops the replica, but it can be restarted with START REPLICA/SLAVE or after next MariaDB server restart.