MySQL主从失败报错误： Got fatal error 1236

一、问题原因及报错误信息

由于MySQL主库意外重启，导致从库无法同步报错如下：

登录从库查看主从同步的错误信息

[root@--- mysql]# vim mysqld-error.log
-- ::  [ERROR] Error reading packet from server: Client requested master to start replication from position > file size; the first event 'master-bin.002295' at , the last event read from './master-bin.002295' at , the last byte read from './master-bin.002295' at . (server_errno=)
-- ::  [ERROR] Slave I/O: Got fatal error  from master when reading data from binary log: 'Client requested master to start replication from position > file size; the first event 'master-bin.' at 1021866995, the last event read from './master-bin.' at 4, the last byte read from './master-bin.' at 4.', Error_code: 1236

[root@192-168-7-101 mysql]# mysql -u root -p
mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: 192.168.3.230
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-bin.002295
          Read_Master_Log_Pos: 1021866995
               Relay_Log_File: 192-168-3-236-relay-bin.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: master-bin.002295
             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: 1021866995
              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: 1236
                Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Client requested master to start replication from position > file size; the first event 'master-bin.002295' at 1021866995, the last event read from './master-bin.002295' at 4, the last byte read from './master-bin.002295' at 4.'
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
                  Master_UUID: f7c24af7-a54a-11e6-88b4-525400169c04
             Master_Info_File: /Data/work/local/mysql/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: 181211 12:57:35
     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)

二、解决方法

1. 先登录到MySQL主库，搜索后并未找到position的位置

[root@--- mysql]# mysqlbinlog  --no-defaults --start-position= master-bin.
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at
# :: server id   end_log_pos  CRC32 0x1fe77f51     Start: binlog v , server v 5.6.-log created  ::
BINLOG '
F3sOXA8BAAAAdAAAAHgAAAAAAAQANS42LjMwLWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAXAAEGggAAAAICAgCAAAACgoKGRkAAVF/
5x8=
'/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

2. 解析binlog日志文件，找到离1021866995最近的position最近的位置102186424

[root@--- mysql]# mysqlbinlog  --no-defaults  master-bin. >/root/test.sql
[root@192-168-7-100 mysql]# vim /root/test.sql
# at
#  :: server id   end_log_pos  CRC32 0xd5613884    Xid =
COMMIT/*!*/;
# at
#  :: server id   end_log_pos  CRC32 0x2b89095e    Query   thread_id= exec_time=     error_code=
SET TIMESTAMP=/*!*/;
BEGIN
/*!*/;
# at
# at 

3.登录从库，重新指定主从的同步位置
[root@192-168-7-101 mysql]# mysql -u root -p
mysql> stop slave;
Query OK,  rows affected,  warning (0.00 sec)

mysql> change master to master_log_file='master-bin.002295',master_log_pos=;
Query OK,  rows affected (0.16 sec)

mysql> start slave;
Query OK,  rows affected (0.03 sec)

mysql> show slave status \G
*************************** . row ***************************
               Slave_IO_State: Queueing master event to the relay log
                  Master_Host: 192.168.3.230
                  Master_User: repl
                  Master_Port:
                Connect_Retry:
              Master_Log_File: master-bin.
          Read_Master_Log_Pos:
               Relay_Log_File: --7.100-relay-bin.
                Relay_Log_Pos:
        Relay_Master_Log_File: master-bin.
             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:
                   Last_Error:
                 Skip_Counter:
          Exec_Master_Log_Pos:
              Relay_Log_Space:
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos:
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno:
                Last_IO_Error:
               Last_SQL_Errno:
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id:
                  Master_UUID: f7c24af7-a54a-11e6-88b4-525400169c04
             Master_Info_File: /Data/work/local/mysql/master.info
                    SQL_Delay:
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: updating
           Master_Retry_Count:
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position:
 row in set (0.00 sec)