Solution to the problem that synchronous replication errors cannot be skipped in MySQL5.6 GTID mode

Database version:

mysql> select version();

+------------+
| version() |
+------------+
| 5.6.10-log |
+------------+
1 row in set (0.02 sec)

Synchronous replication information:

mysql> show slave status\G;

*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.8.25
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:mysql-bin.000007
Read_Master_Log_Pos: 5036
Relay_Log_File: M2-relay-bin.000008
Relay_Log_Pos: 408
Relay_Master_Log_File: mysql-bin.000007
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB: mysql
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1062
Last_Error: Could not execute Write_rows event on table test.t; Duplicate entry '12'
for key 'PRIMARY', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log mysql-bin.000007,
end_log_pos 2267
Skip_Counter: 0
Exec_Master_Log_Pos: 2045
Relay_Log_Space: 3810
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: 1062
Last_SQL_Error: Could not execute Write_rows event on table test.t; Duplicate entry '12'
for key 'PRIMARY', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log mysql-bin.000007,
end_log_pos 2267
Replicate_Ignore_Server_Ids:
Master_Server_Id: 25
Master_UUID: cf716fda-74e2-11e2-b7b7-000c290a6b8f
Master_Info_File: /usr/local/mysql/data2/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: 130313 07:24:43
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: cf716fda-74e2-11e2-b7b7-000c290a6b8f:141-151
Executed_Gtid_Set: cf716fda-74e2-11e2-b7b7-000c290a6b8f:1-140
Auto_Position: 1
1 row in set (0.02 sec)

ERROR:
No query specified

It prompts a primary key conflict. Since it is a test machine, I skip it directly.

mysql> set global sql_slave_skip_counter=1;

ERROR 1858 (HY000): sql_slave_skip_counter can not be set when the server is running with GTID_MODE = ON.
Instead, for each transaction that you want to skip, generate an empty transaction with the same GTID as the transaction

Tip: Since it runs in GTID mode, the sql_slave_skip_counter syntax is not supported. If you want to skip, you must set the transaction ID to a null value.
It seems that this is the only method.

mysql> show global variables like '%GTID%';

+--------------------------+--------------------------------------------+
| Variable_name | Value |
+--------------------------+--------------------------------------------+
| enforce_gtid_consistency | ON |
| gtid_executed | cf716fda-74e2-11e2-b7b7-000c290a6b8f:1-140 |
| gtid_mode | ON |
| gtid_owned | |
| gtid_purged | cf716fda-74e2-11e2-b7b7-000c290a6b8f:1-140 |
+--------------------------+--------------------------------------------+
5 rows in set (0.04 sec)

mysql> set global gtid_executed='';
ERROR 1238 (HY000): Variable 'gtid_executed' is a read only variable
mysql>
mysql> set global gtid_purged='';

ERROR 1840 (HY000): GTID_PURGED can only be set when GTID_EXECUTED is empty.
Frustrating, direct settings don't work.

After checking the manual, I found that I need to execute reset master (note: execute it on the slave, never on the master).

mysql> reset master;
Query OK, 0 rows affected (0.16 sec)

mysql> reset slave;
ERROR 1198 (HY000): This operation cannot be performed with a running slave; run STOP SLAVE first
mysql> stop slave;
Query OK, 0 rows affected (0.08 sec)

mysql> reset slave;
Query OK, 0 rows affected (0.16 sec)

The purpose of executing reset slave is to clear master.info and relay-log.info so that you can change master to master-slave replication later.
Remember the gtid_purged point just now? Just reset the next point.

Here are the steps:

mysql> show global variables like '%GTID%';
+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| enforce_gtid_consistency | ON |
| gtid_executed | |
| gtid_mode | ON |
| gtid_owned | |
| gtid_purged | |
+--------------------------+-------+
5 rows in set (0.06 sec)

mysql> set global gtid_purged='cf716fda-74e2-11e2-b7b7-000c290a6b8f:1-141';
Query OK, 0 rows affected (0.16 sec)

mysql> CHANGE MASTER TO MASTER_HOST='192.168.8.25',MASTER_USER='repl',MASTER_PASSWORD='repl'
,MASTER_AUTO_POSITION = 1;
Query OK, 0 rows affected, 2 warnings (0.32 sec)

mysql> start slave;
Query OK, 0 rows affected (0.13 sec)

mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.8.25
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:mysql-bin.000007
Read_Master_Log_Pos: 5036
Relay_Log_File: M2-relay-bin.000008
Relay_Log_Pos: 408
Relay_Master_Log_File: mysql-bin.000007
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB: mysql
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1050
Last_Error: Error 'Table 't0' already exists' on query.
Default database: 'test'. Query: 'create table t0 like t'
Skip_Counter: 0
Exec_Master_Log_Pos: 2298
Relay_Log_Space: 3557
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: 1050
Last_SQL_Error: Error 'Table 't0' already exists' on query.
Default database: 'test'. Query: 'create table t0 like t'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 25
Master_UUID: cf716fda-74e2-11e2-b7b7-000c290a6b8f
Master_Info_File: /usr/local/mysql/data2/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: 130313 07:50:42
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: cf716fda-74e2-11e2-b7b7-000c290a6b8f:142-151
Executed_Gtid_Set: cf716fda-74e2-11e2-b7b7-000c290a6b8f:1-141
Auto_Position: 1
1 row in set (0.02 sec)

ERROR:
No query specified
### Look, the error message here is different. Repeat this method until the synchronous replication is normal.

mysql> stop slave;
Query OK, 0 rows affected (0.07 sec)

mysql> reset master;
Query OK, 0 rows affected (0.17 sec)

mysql> reset slave;
Query OK, 0 rows affected (0.16 sec)

mysql> set global gtid_purged='cf716fda-74e2-11e2-b7b7-000c290a6b8f:1-151';
Query OK, 0 rows affected (0.13 sec)

mysql> CHANGE MASTER TO MASTER_HOST='192.168.8.25',MASTER_USER='repl',MASTER_PASSWORD='repl'
,MASTER_AUTO_POSITION = 1;
Query OK, 0 rows affected, 2 warnings (0.33 sec)

mysql> start slave;
Query OK, 0 rows affected (0.11 sec)

mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.8.25
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:mysql-bin.000007
Read_Master_Log_Pos: 5036
Relay_Log_File: M2-relay-bin.000008
Relay_Log_Pos: 408
Relay_Master_Log_File: mysql-bin.000007
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB: mysql
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: 5036
Relay_Log_Space: 819
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: 0
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: 25
Master_UUID: cf716fda-74e2-11e2-b7b7-000c290a6b8f
Master_Info_File: /usr/local/mysql/data2/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
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: cf716fda-74e2-11e2-b7b7-000c290a6b8f:1-151
Auto_Position: 1
1 row in set (0.01 sec)

ERROR:
No query specified

Haha, it’s finally solved. It was such a troublesome problem. If you have a better and more convenient solution, please reply to me, thank you.