How to restore replication after slave relay logs are corrupted?

Question

MySQL

There are 2 servers, master-master replication is configured on both. Now replication is broken on one of the servers (slave relay logs are damaged), the following actions usually help:

mysql> show slave status
mysql> stop slave;
mysql> reset slave;
mysql> change master to master_log_file='mysql-bin.***', master_log_pos=***;
mysql> start slave;

But what if the reset slave command was issued, but the show slave status command was omitted before it, and now the values ​​of master_log_file and master_log_pos are unknown?

Answer 1

1. Open the MySQL log /var/log/mariadb/mariadb.log
2. Look for the last entry that contains the necessary information,
3. Follow the instructions:

mysql> change master to master_log_file='mysql-bin.***', master_log_pos=***;
mysql> start slave;
...

Answer 2

stop the live master, remove the dump, reset the muscle logs, start the master, deploy the backup on the slave, start the slave.