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sysbobo

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2015-4-22 12:00:33 | [全部帖] [楼主帖]

楼主

mysql主从复制，经常会遇到错误而导致slave端复制中断，这个时候一般就需要人工干预，跳过错误才能继续
跳过错误有两种方式：
1.跳过指定数量的事务：

mysql>slave stop;
mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1 #跳过一个事务
mysql>slave start

2.修改mysql的配置文件，通过slave_skip_errors参数来跳所有错误或指定类型的错误

vi /etc/my.cnf
[mysqld]
#slave-skip-errors=1062,1053,1146#跳过指定error no类型的错误
#slave-skip-errors=all#跳过所有错误

例：下面模拟一个错误场景
环境（一个已经配置好的主从复制环境）
master数据库IP：192.168.247.128
slave数据库IP：192.168.247.130
mysql版本：5.6.14

binlog-do-db = mydb

在master上执行以下语句：

mysql>use mysql;
mysql>create table t1 (id int);
mysql>use mydb;
mysql>insert into mysql.t1 select 1;

在slave上查看复制状态

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)

由结果可以看到，Read_Master_Log_Pos: 2341，Exec_Master_Log_Pos: 1919 时出错了Last_SQL_Error: Error 'Table 'mysql.t1' doesn't exist' on query.
因为只对mydb记录了binlog,当在mydb库操作其它数据库的表，但该表在slave上又不存在时就出错了。

我们可在看看binlog里的事务内容，这里一行代表一个事务

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)

由上面的结果可知，我们需要跳过两个事务（Pos: 1999 insert,Pos: 2103 commit)
跳过操作：

mysql>slave stop;

mysql>SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 2 跳过一个事务

mysql>slave start
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)

复制状态正常。

--转自