早在MySQL5.1官方就推出相应的解决方案,参数--master-connect-retry=seconds.此参数官方给出的中文解释如下:
--master-connect-retry=seconds
在主服务器宕机或连接丢失的情况下，从服务器线程重新尝试连接主服务器之前睡眠的秒数。如果主服务器.info文件中的值可以读取则优先使用。如果未设置， 默认值为60。
具体实现方式:
一、直接编辑my.cnf在[mysqld]添加master-connect-retry
二、直接在change master的时候添加此参数
简单做个实验如下:
Master:192.168.23.123
Slave:192.168.23.98
Master:mysql> select count(*) from t;
+----------+
| count(*) |
+----------+
| 3145728 |
+----------+
1 row in set (16.39 sec)
Slave:
mysql> select count(*) from t;
+----------+
| count(*) |
+----------+
| 0 |
+----------+
1 row in set (0.01 sec)
mysql> change master to master_host='192.168.23.123',master_user='repl',master_password='xxxxxx',master_connect_retry=30;
Query OK, 0 rows affected, 0 warnings (0.06 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.23.123
Master_User: repl
Master_Port: 3306
Connect_Retry: 30
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: mysqld-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: No
Replicate_Do_DB: percona
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: 0
Relay_Log_Space: 120
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: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
Master_UUID: 69a73914-62ca-11e3-870f-080027dff846
Master_Info_File: /mysql/data/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:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
mysql>
mysql> start slave;
Query OK, 0 rows affected (0.03 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.23.123
Master_User: repl
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: mysql-bin.000015
Read_Master_Log_Pos: 4170
Relay_Log_File: mysqld-relay-bin.000019
Relay_Log_Pos: 3208
Relay_Master_Log_File: mysql-bin.000015
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: percona
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: 3045
Relay_Log_Space: 5344
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: 496
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: 2
Master_UUID: 69a73914-62ca-11e3-870f-080027dff846
Master_Info_File: /mysql/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Sending data
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 (0.00 sec)
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.23.123
Master_User: repl
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: mysql-bin.000015
Read_Master_Log_Pos: 4170
Relay_Log_File: mysqld-relay-bin.000019
Relay_Log_Pos: 3433
Relay_Master_Log_File: mysql-bin.000015
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: percona
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: 3270
Relay_Log_Space: 5344
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: 495
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: 2
Master_UUID: 69a73914-62ca-11e3-870f-080027dff846
Master_Info_File: /mysql/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Sending data
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 (0.00 sec)
模拟网络闪断等一会儿恢复网络ifup eth1看一下会不会继续复制,还是需要在stop slave、start slave才可以.
断开网络前:
Slave:
mysql> select count(*) from t;
+----------+
| count(*) |
+----------+
| 393216 |
+----------+
1 row in set (1.89 sec)
恢复网络后
Slave:
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.23.123
Master_User: repl
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: mysql-bin.000015
Read_Master_Log_Pos: 4170
Relay_Log_File: mysqld-relay-bin.000023
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000015
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: percona
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: 4170
Relay_Log_Space: 794
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: 2
Master_UUID: 69a73914-62ca-11e3-870f-080027dff846
Master_Info_File: /mysql/data/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 (0.00 sec)
mysql> use percona
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>
mysql>
mysql> select count(*) from t;
+----------+
| count(*) |
+----------+
| 3145728 |
+----------+
1 row in set (15.73 sec)
OK,这样我们在管理批量Slave的时候就不会因网络闪断总是做重复的工作.顺便回顾加深一下基础知识.^_^