收到报警，mysql的从数据库在同步的过程出现问题，已停止同步。

ERROR] Slave SQL:  Error  "Lock wait timeout exceeded; try restarting transaction" on query. Default database: "yang". Query: "UPDATE workitem SET status = state, modify_time=1329640301 where workitem_id = 800", Error_cod

Slave sql not running: result is No|slave_sql_running=0

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root@127.0.0.1 : yang 16:48:34> show slave status \G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 10.249.119.52

Master_User: replicator

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.001156

Read_Master_Log_Pos: 49021182

Relay_Log_File: slave-relay.118531

Relay_Log_Pos: 1342

Relay_Master_Log_File: mysql-bin.001156

Slave_IO_Running: Yes

Slave_SQL_Running: No

........

Last_Errno: 1205

Last_Error: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'yang'. Query: 'UPDATE workitem SET status = state, modify_time=1329640301 where workitem_id = 800'

Skip_Counter: 0

Exec_Master_Log_Pos: 47702497

Relay_Log_Space: 1319098

Until_Condition: None

Until_Log_File:

Until_Log_Pos: 0

Master_SSL_Allowed: No

...........

Seconds_Behind_Master: NULL

Master_SSL_Verify_Server_Cert: No

Last_IO_Errno: 0

Last_IO_Error:

Last_SQL_Errno: 1205

Last_SQL_Error: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'yang'. Query: 'UPDATE work SET status = state, modify_time=1329640301 where work_id = 800'

1 row in set (0.00 sec)

从库由于Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'yang'. Query: 'UPDATE work SET status = state, modify_time=1329640301 where work_id = 800'； 锁等待超时导致事务失败，多次重试不成功。Slave_SQL_进程中断！

解决办法一:

1.首先停掉Slave服务:

mysql>slave stop;

2.到主服务器上查看主机状态,

mysql> show master status;

+------------------+-----------+--------------+------------------+

| File             | Position  | Binlog_Do_DB | Binlog_Ignore_DB |

+------------------+-----------+--------------+------------------+

| mysql-bin.001156 | 48291554  |              |                  |

+------------------+-----------+--------------+------------------+

1 row in set (0.00 sec)

记录File和Position对应的值 mysql-bin.001156,48291554

3 到slave服务器上执行手动同步:

mysql> change master to

> master_host='master_ip',

> master_user='user',

> master_password='pwd',

> master_port=3306,

> master_log_file='mysql-bin.001156',

> master_log_pos=48291554;

1 row in set (0.00 sec)

mysql> slave start;

1 row in set (0.00 sec)

再次查看slave状态发现:

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

...

Seconds_Behind_Master: 0

注:这种办法可能会导致从服务器上的数据不完整,如从服务器一直出错,但主服务器日志文件一直在增加,过好长时间,再直接从主服务器上取日志位置,可能会造成错误期间的数据无法更新到从服务器中.这里建议采用下面的这种办法(将错误语句直接跳过).

解决办法二:

mysql> slave stop;

mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;

mysql> slave start;

set GLOBAL SQL_SLAVE_SKIP_COUNTER=N,用来跳过备机的一条或N条出错的复制语句。然后重新start slave即可。

由于我们的是双master 架构，所以为了避免重复执行变更的语句，实际操作：

root@127.0.0.1 : (none) 16:56:00> SET SQL_LOG_bin=0;

Query OK, 0 rows affected (0.00 sec)

root@127.0.0.1 : (none) 16:56:06> use yang;

Database changed

执行导致错误的语句

root@127.0.0.1 : yang 16:56:10> UPDATE workitem SET status = state, modify_time=1329640301 where workitem_id = 800;

Query OK, 1 row affected (0.00 sec)

Rows matched: 1  Changed: 1  Warnings: 0

root@127.0.0.1 : yang 16:56:45>stop slave;

Query OK, 0 rows affected (0.00 sec)

root@127.0.0.1 : yang 16:56:46>set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;

Query OK, 0 rows affected (0.00 sec)

root@127.0.0.1 : yang 16:56:46>start slave;

Query OK, 0 rows affected (0.00 sec)

最终确认结果

root@127.0.0.1 : (none) 16:59:40> show slave status \G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 10.249.119.52

Master_User: replicator

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.001156

Read_Master_Log_Pos: 49846932

Relay_Log_File: slave-relay.118532

Relay_Log_Pos: 235831

Relay_Master_Log_File: mysql-bin.001156

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

..........

Last_Errno: 0

Last_Error:

Skip_Counter: 0

Exec_Master_Log_Pos: 49846932

Relay_Log_Space: 2144848

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:

1 row in set (0.00 sec)

至此问题解决~！