MySQL5.7延迟复制半同步复制

　　　　　　　　　　　　MySQL5.7延迟复制半同步复制

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰 

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一.延迟复制

1>.什么是延迟复制

　　延迟复制是指定从库对主库的延迟至少是指定的这个间隔时间，默认是0秒。可以通过CHANGE MASTER TO命令来指定。例如：CHANGE MASTER TO MASTER_DELAY=N;其原理是从库收到主库的bin log之后，而是等待指定的秒数之后再执行。

mysql> 
mysql> show slave stATUS\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: node101.yinzhengjie.org.cn
                  Master_User: copy
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: yinzhengjie-mysql-bin.000003
          Read_Master_Log_Pos: 154
               Relay_Log_File: node102-relay-bin.000006
                Relay_Log_Pos: 391
        Relay_Master_Log_File: yinzhengjie-mysql-bin.000003
             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: 154
              Relay_Log_Space: 778
              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: b2127a6e-3cf8-11e9-ae0d-000c29fe9bef
             Master_Info_File: /yinzhengjie/softwares/mysql-5.7.25-linux-glibc2.12-x86_64/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           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
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

mysql> 
mysql> STOP SLAVE;
Query OK, 0 rows affected (0.00 sec)

mysql> 
mysql> show slave stATUS\G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: node101.yinzhengjie.org.cn
                  Master_User: copy
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: yinzhengjie-mysql-bin.000003
          Read_Master_Log_Pos: 154
               Relay_Log_File: node102-relay-bin.000006
                Relay_Log_Pos: 391
        Relay_Master_Log_File: yinzhengjie-mysql-bin.000003
             Slave_IO_Running: No
            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: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 154
              Relay_Log_Space: 778
              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: 1
                  Master_UUID: b2127a6e-3cf8-11e9-ae0d-000c29fe9bef
             Master_Info_File: /yinzhengjie/softwares/mysql-5.7.25-linux-glibc2.12-x86_64/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
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

mysql> 
mysql> CHANGE MASTER TO MASTER_DELAY=5;
Query OK, 0 rows affected (0.01 sec)

mysql> 
mysql> START SLAVE;
Query OK, 0 rows affected (0.00 sec)

mysql> 
mysql> show slave stATUS\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: node101.yinzhengjie.org.cn
                  Master_User: copy
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: yinzhengjie-mysql-bin.000003
          Read_Master_Log_Pos: 154
               Relay_Log_File: node102-relay-bin.000002
                Relay_Log_Pos: 332
        Relay_Master_Log_File: yinzhengjie-mysql-bin.000003
             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: 154
              Relay_Log_Space: 541
              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: b2127a6e-3cf8-11e9-ae0d-000c29fe9bef
             Master_Info_File: /yinzhengjie/softwares/mysql-5.7.25-linux-glibc2.12-x86_64/data/master.info
                    SQL_Delay: 5
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           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
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

mysql> 

mysql> CHANGE MASTER TO MASTER_DELAY=5;