I sent the following RFC patch series to the Git mailing list last June:

https://public-inbox.org/git/[email protected]/
https://public-inbox.org/git/[email protected]/

The goal is to make it possible for Git to use external object databases.

These external object databases would be another way for Git to store its objects (blobs, trees, commits, tags). Currently there are 2 ways for Git to store its objects: loose object files and pack-files. But the current ways are not the best for big files.

I will keep this issue updated if people are interested.