Comment by threatofrain

Another interesting tree filesystem data structure is the Bε-tree ("b epsilon tree"), which also tries to bridge the gap between small writes and the large pages of modern drives. The first paper/talk from 2015 has a fun name "BetrFS: A Right-Optimized Write-Optimized File System" and they published a few dozen times until 2022. https://www.betrfs.org/

I've read this paper and it's a neat idea. It hasn't been introduced into popular oss databases like postgres and mysql, and my understanding is it has some drawbacks for real prod use vs ths simplistic benchmarks presented in the paper.

Would love to know if anyones built something using it outside of academic testing.