数据库主从报Got fatal error 1236 from master when reading data from binary log: 'Could not open log file'

数据库主从不同步时报“Got fatal error 1236 from master when reading data from binary log: 'Could not open log file'”解决方法。

查看问题点：

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.109.132
                  Master_User: replicater
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: dbmaster-bin.000002
          Read_Master_Log_Pos: 120
               Relay_Log_File: mysqld-relay-bin.000012
                Relay_Log_Pos: 286
        Relay_Master_Log_File: dbmaster-bin.000002
             Slave_IO_Running: No
            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: 120
              Relay_Log_Space: 626
              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: 1236
                Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not open log file'
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 132
                  Master_UUID: 03ab7a6c-33f3-11e9-b59b-000c2956d023
             Master_Info_File: /data/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: 190220 09:00:13
     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)

很显然这是没能从master读到文件了的内容。

解决方法：

master端：

mysql> flush logs;
Query OK, 0 rows affected (0.02 sec)

mysql> show master status;
+---------------------+----------+--------------+------------------+-------------------+
| File                | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------------+----------+--------------+------------------+-------------------+
| dbmaster-bin.000005 |      120 |              |                  |                   |
+---------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

记住file和position这两个选项

slave端：

mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)

mysql> change master to master_log_file ='dbmaster-bin.000005',master_log_pos=120;
Query OK, 0 rows affected (0.01 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

再次查看状态就会发现成功了。