key-value

What happened

I was able to successfully login and operate using default credentials

What you expected to happen

After a successful login using default admin credentials immuadmin does request a password change but if confirmation password does not match the newly introduced one, I'd expect to be blocked but it was possible to operate.

**How to reproduce it (as minimally and pr

Currently we don't have any mechanism to limit the maximum number of clients that could be handled simultaneously.

This feature should be designed properly. Here is some clue: https://redis.io/topics/clients#maximum-number-of-clients

hint file 是 bitcask 中对于启动时，建立索引的一种优化手段。
如果 db 存在大量的数据文件，那么再次打开 db 时，必须重新扫描所有数据文件重建索引，这样的效率是十分低下的，因此 bitcask 提出了 hint file 保存索引文件来帮助 db 进行快速启动。

本人自告奋勇想为 rosedb 实现 hint file 这个 feature，故开此 issue 来听取大家意见，为 rosedb 略尽绵薄之力。