Topology refactoring using classic MySQL replication commands – version 2

This one in not very different than Topology refactoring using classic MySQL replication commands - version 1, actually it's the other way around.

Context:

  • Initial state:
    dbfoo1(M) - dbfoo2(S)
              \ dbfoo3(S)
  • Desired state:
    dbfoo1(M) - dbfoo2(MS) - dbrfoo3(S)
  • Let's get it done:

    1. stop slave on dbfoo3
    2. MariaDB [(none)]> stop slave;
    3. check the "freezing point" on dbfoo2 and note down the output from 'show' commands
    4. MariaDB [(none)]> stop slave; show master status\Gshow slave status\Gstart slave;
      
      *************************** 1. row ***************************
                  File: bin.009642
              Position: 91547140
          Binlog_Do_DB: 
      Binlog_Ignore_DB: 
      1 row in set (0.00 sec)
      
      *************************** 1. row ***************************
                     Slave_IO_State: 
                        Master_Host: dbfoo1
                        Master_User: user
                        Master_Port: 3306
                      Connect_Retry: 60
                    Master_Log_File: bin.293567
                Read_Master_Log_Pos: 90061272
                     Relay_Log_File: relay.028914
                      Relay_Log_Pos: 90061553
              Relay_Master_Log_File: bin.293567
                   Slave_IO_Running: No
                  Slave_SQL_Running: No
                    Replicate_Do_DB: 
                Replicate_Ignore_DB: 
                 Replicate_Do_Table: 
             Replicate_Ignore_Table: 
            Replicate_Wild_Do_Table: 
        Replicate_Wild_Ignore_Table: 
                         Last_Errno: 0
                         Last_Error: 
                       Skip_Counter: 0
                Exec_Master_Log_Pos: 90061272
                    Relay_Log_Space: 90062173
                    Until_Condition: None
                     Until_Log_File: 
                      Until_Log_Pos: 0
                 Master_SSL_Allowed: No
                 Master_SSL_CA_File: 
                 Master_SSL_CA_Path: 
                    Master_SSL_Cert: 
                  Master_SSL_Cipher: 
                     Master_SSL_Key: 
              Seconds_Behind_Master: NULL
      Master_SSL_Verify_Server_Cert: No
                      Last_IO_Errno: 0
                      Last_IO_Error: 
                     Last_SQL_Errno: 0
                     Last_SQL_Error: 
        Replicate_Ignore_Server_Ids: 
                   Master_Server_Id: 270
                     Master_SSL_Crl: 
                 Master_SSL_Crlpath: 
                         Using_Gtid: No
                        Gtid_IO_Pos: 
      1 row in set (0.00 sec)
      
      Query OK, 0 rows affected (0.00 sec)
    5. make sure dbfoo3 has the same data as dbfoo2 and use Relay_Master_Log_File and Exec_Master_Log_Pos from show master status
    6. MariaDB [(none)]> start slave until master_log_file='bin.293567', master_log_pos=90061272;
    7. point dbfoo3 to dbfoo2 and start the slave
    8. MariaDB [(none)]> stop slave;
      MariaDB [(none)]> change master to master_host='foo2', master_log_file='bin.009642', master_log_pos=91547140;
      MariaDB [(none)]> start slave;

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