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MySQL slave upgrade: Slave failed to initialize relay log info structure from the repository

开发技术 开发技术 2022-12-30 次浏览

MySQL slave after upgrade from 5.6.x to 5.7.x may throw the following error:

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mysql> START SLAVE;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository

The best solution for this error is to:

  • Master server – mysqldump the database with –master-data=1 –single-transaction
  • On the slave server issue command “RESET SLAVE;”
  • On the slave server import the dump sql file and issue “CHANGE MASTER” command with the meta data written in the sql dump
  • On the slave server issue START SLAVE to start the replication.

Here is an a real world example:
First, mysqldump in the master with

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root@master ~ # mysqldump --master-data=1 --single-transaction mydb > /root/mydb.sql
root@master ~ # grep "CHANGE MASTER" media.sql
CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.023283', MASTER_LOG_POS=537774724;

And then copy the dump file to the slave server and import it and issue several specific slave commands:

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root@slave ~ # mysql < /root/mydb.sql
root@slave ~ # mysql
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 23
Server version: 5.7.31-log Gentoo Linux mysql-5.7.31
 
Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
 
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
 
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
 
mysql> reset slave;
Query OK, 0 rows affected (0.01 sec)
mysql> CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.023283', MASTER_LOG_POS=537774724;
Query OK, 0 rows affected (0.00 sec)
mysql> START SLAVE;
Query OK, 0 rows affected (0.00 sec)
 
mysql> show slave statusG;
*************************** 1. row ***************************
               Slave_IO_State: Queueing master event to the relay log
                  Master_Host: 10.10.10.10
                  Master_User: ruser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.023283
          Read_Master_Log_Pos: 641769286
               Relay_Log_File: slave-relay-bin.000002
                Relay_Log_Pos: 90874706
        Relay_Master_Log_File: mysql-bin.023283
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table: mydb.%
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 628649113
              Relay_Log_Space: 103995088
              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: 2395
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: 101
                  Master_UUID: cd1bcebb-cc27-11e8-90c9-801844f2c4d8
             Master_Info_File: /mnt/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Reading event from the relay log
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

The replication is advancing. It is 2395 seconds behind the master.

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