mysql5.6设置主从报错1236，Increase max_allowed_packet on master，原因却是Binlog偏移量不对

时间：2022-10-29 10:34:32
在试Mysql5.6，搭了个主从：
CHANGE MASTER TO

MASTER_HOST='1.2.3.4',

master_user='slave',

master_password='xxxqqq',

master_port=,

MASTER_LOG_FILE='binlog.000001',

MASTER_LOG_POS=;
一切正常。然后在主上建个表，在从上一看没有。再看看状态：
mysql> show slave status\G;

*************************** . row ***************************

               Slave_IO_State:

                  Master_Host: 1.2.3.4

                  Master_User: slave

                  Master_Port:

                Connect_Retry:

              Master_Log_File: binlog.

          Read_Master_Log_Pos:

               Relay_Log_File: relaylog.

                Relay_Log_Pos:

        Relay_Master_Log_File: binlog.

             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:

                   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: NULL

Master_SSL_Verify_Server_Cert: No

                Last_IO_Errno:

                Last_IO_Error: Got fatal error  from master when reading data from binary log: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master; the first event 'binlog.' at 107, the last event read from '/mnt/disk1/mysql_5615_binlog/binlog.' at 107, the last byte read from '/mnt/disk1/mysql_5615_binlog/binlog.' at 126.'

               Last_SQL_Errno:

               Last_SQL_Error:

  Replicate_Ignore_Server_Ids:

             Master_Server_Id:

                  Master_UUID: aa8bc3d4-81aa-11e3--001517a25b3a

             Master_Info_File: /mnt/disk1/mysql_5615/master.info

                    SQL_Delay:

          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:

                  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)

ERROR:

No query specified
确认了我的max_allowed_packet 是32M，太够了啊。搞了半天无果，后来搜了搜，发现了这个贴子（http://blog.chinaunix.net/uid-451-id-3087001.html），说是根本原因是偏移量不对。于是去主上看看：
mysqlbinlog binlog.

/*!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 0xf881fb00        Start: binlog v , server v 5.6.-debug-log created   :: at startup

ROLLBACK/*!*/;

BINLOG '

KcPdUg9ZAgAAdAAAAHgAAAAAAAQANS42LjE1LWRlYnVnLWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAApw91SEzgNAAgAEgAEBAQEEgAAXAAEGggAAAAICAgCAAAACgoKGRkAAQD7

gfg=

'/*!*/;

# at

#  :: server id   end_log_pos  CRC32 0x4763204a        Query   thread_id=     exec_time=     error_code=
于是在从上重新change master to，把偏移量设成120，就一切正常了。
我之前搞Mysql5.5时一直是偏移量107的，到了现在5.6了变成了120，有趣。
另外也是头脑反应慢了些，其实在主上看状态时也应该能反应到的：
mysql> show binary logs;

+---------------+-----------+

| Log_name      | File_size |

+---------------+-----------+

| binlog. |        |

| binlog. |        |

| binlog. |        |

+---------------+-----------+

 rows in set (0.03 sec)

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