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MySQL 5.7 复制报错 Client requested master to start replication from impossible 怎么办

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错误日志中的信息
2017-12-12T07:41:47.070228Z 57896 [ERROR] Error reading packet from server for channel master_4 : Client requested master to start replication from impossible position; the first event mysql-bin.000003 at 31342251, the last event read from /data/db_log/mysql-bin.000003 at 4, the last byte read from /data/db_log/mysql-bin.000003 at 4. (server_errno=1236)

2017-12-12T07:41:47.077618Z 57896 [ERROR] Slave I/O for channel master_4 : Got fatal error 1236 from master when reading data from binary log: Client requested master to start replication from impossible position; the first event mysql-bin.000003 at 31342251, the last event read from /data/db_log/mysql-bin.000003 at 4, the last byte read from /data/db_log/mysql-bin.000003 at 4. , Error_code: 1236

报错原因
执行 change master 语句时，里面的  master_log_file 写的不正确

解决方法
在 change master 语句里，写上正确的  master_log_file

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