MySQL 8.0已经不支持下面这种命令写法
grant all privileges on *.* to root@"%" identified by ".";
正确的写法是先创建用户
CREATE USER ‘root‘@‘%‘ IDENTIFIED BY ‘Hadoop3!‘;
再给用户授权
grant all privileges on *.* to ‘root‘@‘%‘ ;
Mysql8.0不支持grant all privileges on *.* to root@“%“ identified by “.“；
原文：https://www.cnblogs.com/caibaotimes/p/14166038.html