今天监控显示mysql主从复制出错了，信息如下：

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State:

Master_Host: 192.168.33.230

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: master-bin.000774

Read_Master_Log_Pos: 202924128

Relay_Log_File: 192-168-33-236-relay-bin.000065

Relay_Log_Pos: 202924292

Relay_Master_Log_File: master-bin.000774

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: 202924128

Relay_Log_Space: 202924521

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.000774‘ at 202924128, the last event read from ‘./master-bin.000774‘ at 4, the last byte read from ‘./master-bin.000774‘ 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/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: 170817 15:37:11

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)

ERROR:

No query specified

在mysql.cnf里面有一句跳过经常出现的错误，但是还是报了1236错误

slave-skip-errors = 1062,1091,1396,1050,1060,1054,1146,1236

尝试stop slave ； start slave 还是没有恢复

然后就照着上面的错误提示更新pos点

mysql> stop slave;

Query OK, 0 rows affected (0.01 sec)

mysql> change master to master_log_file=‘master-bin.000774‘, master_log_pos=4;

Query OK, 0 rows affected (0.12 sec)

mysql> start slave;

Query OK, 0 rows affected (0.00 sec)

然后查看状态就恢复正常了，具体原因再慢慢分析,,,,,,,

有时候还会报下面这个信息

Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: ‘could not find next log; the first event ‘mysql-bin.001891‘ at 897184977, the last event read from ‘./mysql-bin.001891‘ at 1109808979, the last byte read from ‘./mysql-bin.001891‘ at 1109808979.‘

上面这个错误尝试stop slave ； start slave 就恢复了

mysql主从复制1236错误

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