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I have two MariaDB instances (named A and B). I want to set up replication between A and B.
To do this, I perform a Mysqldump backup on A with the following parameters --opt --single-transaction --flush-privileges --routines --events --all-databases --master-data --gtid
On instance B, i restore my backup and start replica.
Everything seems correct.
The global variable gtid_slave_pos is populated.
show variables like "gtid_slave_pos";
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+----------------+---------+
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| Variable_name | Value |
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+----------------+---------+
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| gtid_slave_pos | 0-1-905 |
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+----------------+---------+
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The status of the replica is correct.
mysql:root:(none)>* show replica status \G;*
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_ Slave_IO_State: Waiting for master to send event
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Master_Host: 192.168.2.191
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Master_User: replication
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Master_Port: 3306
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Connect_Retry: 60
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Master_Log_File: myserver01_logbin.000003
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Read_Master_Log_Pos: 475
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Relay_Log_File: myserver01_relaylog.000002
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Relay_Log_Pos: 684
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Relay_Master_Log_File: myserver01_logbin.000003
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Slave_IO_Running: Yes
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Slave_SQL_Running: Yes
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Replicate_Do_DB:
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Replicate_Ignore_DB:
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Replicate_Do_Table:
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Replicate_Ignore_Table:
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Replicate_Wild_Do_Table:
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Replicate_Wild_Ignore_Table:
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Last_Errno: 0
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Last_Error:
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Skip_Counter: 0
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Exec_Master_Log_Pos: 475
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Relay_Log_Space: 993
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Until_Condition: None
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Until_Log_File:
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Until_Log_Pos: 0
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Master_SSL_Allowed: No
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Master_SSL_CA_File:
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Master_SSL_CA_Path:
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Master_SSL_Cert:
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Master_SSL_Cipher:
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Master_SSL_Key:
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Seconds_Behind_Master: 0
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Master_SSL_Verify_Server_Cert: No
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Last_IO_Errno: 0
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Last_IO_Error:
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Last_SQL_Errno: 0
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Last_SQL_Error:
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Replicate_Ignore_Server_Ids:
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Master_Server_Id: 1
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Master_SSL_Crl:
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Master_SSL_Crlpath:
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Using_Gtid: Slave_Pos
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Gtid_IO_Pos: 0-1-905
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Replicate_Do_Domain_Ids:
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Replicate_Ignore_Domain_Ids:
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Parallel_Mode: optimistic
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SQL_Delay: 0
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SQL_Remaining_Delay: NULL
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Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
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Slave_DDL_Groups: 0
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Slave_Non_Transactional_Groups: 0
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Slave_Transactional_Groups: 0_
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However, the mysql.gtid_slave_pos table is empty.
If I stop and restart my instance B, the replication fails. The replication is restarted with an incorrect GTID.
show variables like "gtid_slave_pos";
| Variable_name |
Value |
| gtid_slave_pos |
0-1-5 |
The mysql.gtid_slave_pos table is populated with inconsistent values.
select * from mysql.gtid_slave_pos;
| domain_id |
sub_id |
server_id |
seq_no |
| 0 |
1 |
1 |
1 |
| 0 |
2 |
1 |
2 |
| 0 |
3 |
1 |
3 |
| 0 |
4 |
1 |
4 |
| 0 |
5 |
1 |
5 |
My analysis:
Normally the mysql.gtid_slave_pos table is populated when you set the gtid_slave_pos variable. In the header of my dump file,i find the command to feed the gtid_slave_pos variable. But at the end of the file I find the orders to recreate the table mysql.gtid_slave_pos. What should happen when I restore my file first the gtid_slave_pos variable is populated as well as the mysql.gtid_slave_pos table. Then the mysql.gtid_slave_pos table is recreated having lost the original gtid.
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