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https://github.com/rqlite/rqlite/blob/master/DOC/DESIGN.md

I built a distributed database using Raft and SQLite, and I put a lot of thought into its design and implementation -- to make it as simple (but not simplistic) and clear as possible. One goal was clear separation between the consensus layer, the database access, and the HTTP API. I think it's a good resource to study (even if I do say so myself).

Yes, the Postgresql source and associated docs. It's a well-structured code base that is easy enough to dive into, if you don't try to understand the whole thing at once. I'm slowly reading it in bits and pieces.

Here's a Github mirror so you can browse around: https://github.com/postgres/postgres

Note that the offical repo is at git.postgresql.org.

Should mention the newer OReilly "Database Internals" book here: https://www.oreilly.com/library/view/database-internals/9781...

CMU DB Group has all their lectures on youtube. Checkout 15445 and 15721 https://www.youtube.com/channel/UCHnBsf2rH-K7pn09rb3qvkA

You might find useful guidance here: http://www.aosabook.org/en/

https://github.com/speakeasy-engine/contentdb