mysql master-slave replication, often encounter errors and lead to slave end replication interruption, this time generally requires manual intervention, skip errors to continue
There are two ways to skip errors:
1.1 Skip a specified number of transactions:
mysql>stop slave; mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1; #Skip a transaction mysql>start slave;
1.2 Modify mysql configuration file to skip all errors or specified types of errors through the slave_skip_errors parameter
vi /etc/my.cnf [mysqld] #slave-skip-errors=1062,1053,1146 #Skip the error of the specified error no type #slave-skip-errors=all #Skip all errors
2 cases
Let's simulate an error scenario
Environment (a configured master-slave replication environment)
master database IP: 192.168.247.128
Slve database IP: 192.168.247.130
mysql version: 5.6.14
binlog-do-db = mydb
Execute the following statement on master:
mysql>use mysql; mysql>create table t1 (id int); mysql>use mydb; mysql>insert into mysql.t1 select 1;
View replication status on slave
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.247.128
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000017
Read_Master_Log_Pos: 2341
Relay_Log_File: DBtest1-relay-bin.000011
Relay_Log_Pos: 494
Relay_Master_Log_File: mysql-bin.000017
Slave_IO_Running: Yes
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: 1146
Last_Error: Error 'Table 'mysql.t1' doesn't exist' on query. Default database: 'mydb'. Query: 'insert into mysql.t1 select 1'
Skip_Counter: 0
Exec_Master_Log_Pos: 1919
Relay_Log_Space: 1254
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: 1146
Last_SQL_Error: Error 'Table 'mysql.t1' doesn't exist' on query. Default database: 'mydb'. Query: 'insert into mysql.t1 select 1'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: f0f7faf6-51a8-11e3-9759-000c29eed3ea
Master_Info_File: /var/lib/mysql/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: 131210 21:37:19
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)As can be seen from the results, Read_Master_Log_Pos: 2341, Exec_Master_Log_Pos: 1919 error Last_SQL_Error: Error'Table'mysql.t1'does't exist' on query.
Because only binlog is recorded for mydb, errors occur when tables in other databases are operated on the mydb library but do not exist on slave.
Let's look at the transaction content in the binlog, where a row represents a transaction.
mysql> SHOW BINLOG EVENTS in 'mysql-bin.000017' from 1919\G
*************************** 1. row ***************************
Log_name: mysql-bin.000017
Pos: 1919
Event_type: Query
Server_id: 1
End_log_pos: 1999
Info: BEGIN
*************************** 2. row ***************************
Log_name: mysql-bin.000017
Pos: 1999
Event_type: Query
Server_id: 1
End_log_pos: 2103
Info: use `mydb`; insert into mysql.t1 select 1
*************************** 3. row ***************************
Log_name: mysql-bin.000017
Pos: 2103
Event_type: Xid
Server_id: 1
End_log_pos: 2134
Info: COMMIT /* xid=106 */
*************************** 4. row ***************************
Log_name: mysql-bin.000017
Pos: 2134
Event_type: Query
Server_id: 1
End_log_pos: 2213
Info: BEGIN
*************************** 5. row ***************************
Log_name: mysql-bin.000017
Pos: 2213
Event_type: Query
Server_id: 1
End_log_pos: 2310
Info: use `mydb`; insert into t1 select 9
*************************** 6. row ***************************
Log_name: mysql-bin.000017
Pos: 2310
Event_type: Xid
Server_id: 1
End_log_pos: 2341
Info: COMMIT /* xid=107 */
6 rows in set (0.00 sec)From the above results, we need to skip two transactions (Pos: 1999 insert, Pos: 2103 commit)
Skip operation:
mysql>stop slave;
mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 2; Skip a transaction
mysql>start slave;
mysql> show slave status\G
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 3
Current database: mydb
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.247.128
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000017
Read_Master_Log_Pos: 3613
Relay_Log_File: DBtest1-relay-bin.000018
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000017
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
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: 3613
Relay_Log_Space: 458
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: 1
Master_UUID: f0f7faf6-51a8-11e3-9759-000c29eed3ea
Master_Info_File: /var/lib/mysql/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:
Auto_Position: 0
1 row in set (0.01 sec)The replication status is normal.