sudo command doesn't work

It is convenient to add the root privilege of hadoop user directly in sudo vi /etc/sudoers.

    添加：用户名 ALL=(ALL) ALL

As a result, the following error is prompted when using sudo next:

sudo: /etc/sudoers 可被任何人写

sudo: 没有找到有效的 sudoers 资源，退出

sudo: 无法初始化策略插件

The permissions of sudoers have been changed, just change it back.

    pkexec chmod 0440 /etc/sudoers