Event description

I did a read-write separation experiment on the virtual machine. After the end, I found that the slave SQL process stopped from the server. The first reaction at that time was that the master-bin binary file had a problem.

mysql> show slave status\G;     //在slave上查看的状态记录
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 20.0.0.12
                  Master_User: myslave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-bin.000007
          Read_Master_Log_Pos: 154
               Relay_Log_File: relay-log-bin.000019
                Relay_Log_Pos: 677
        Relay_Master_Log_File: master-bin.000006
             Slave_IO_Running: Yes
            Slave_SQL_Running: No

After that, I went to the master to check the status, and found that there was no abnormality, and the binary files were compared correctly. Thinking left and right, it may be related to the separation test of reading and writing today. It may be that in the final verification stage of the test, the operation of writing data from the server to test the test results caused the SQL thread to be abnormal.

mysql> show master status;    //查看master状态
+-------------------+----------+--------------+------------------+-------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| master-bin.000007 |      154 |              |                  |                   |
+-------------------+----------+--------------+------------------+-------------------+

Solution

After verification, it is indeed caused by writing data on the slave server. The solution is as follows:

stop slave; //Close the master and slave first
set GLOBAL SQL_SLAVE_SKIP_COUNTER=1; //Set to skip the last error
start slave; //Start the master and slave again

mysql> stop slave ;   //先关闭主从
Query OK, 0 rows affected (0.00 sec)

mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;   //设置跳过上一次错误
Query OK, 0 rows affected (0.00 sec)

mysql> start slave ;   //再次开启主从
Query OK, 0 rows affected (0.01 sec)

mysql> show slave status\G;    //查看，状态已经正常了
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 20.0.0.12
                  Master_User: myslave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-bin.000007
          Read_Master_Log_Pos: 419
               Relay_Log_File: relay-log-bin.000021
                Relay_Log_Pos: 321
        Relay_Master_Log_File: master-bin.000007
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

MySQL master-slave synchronous replication, Slave_SQL_Running: No failure occurs! ! !

Event description

Solution

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