Comment by gtrubetskoy

I forked Redis to create Thredis almost 9 years ago. Some notes on how it was implemented:

https://github.com/grisha/thredis/blob/master/README-THREDIS

Then I added SQLite to it, more details here:

http://thredis.org

This was all done mostly for fun, though I did use it in a an actual project for a while.