Note that some of the people involved are also the original authors of TokuDB [0], including Bradley Kuszmaul [1] , Michael Bender [2], and Martin Farach-Colton [3] who were the founders of Tokutek (acquired by Percona in 2015).

Previous discussion with the authors: A Comparison of Log-Structured Merge (LSM) and Fractal Tree Indexing https://news.ycombinator.com/item?id=9248298

[0] TokuDB Fractal Tree Index https://github.com/Tokutek/ft-index TokuDB Engine https://github.com/percona/tokudb-engine

[1] Bradley Kuszmaul http://people.csail.mit.edu/bradley/startups.html

[2] Michael Bender https://www3.cs.stonybrook.edu/~bender/

[3] Martin Farach-Colton https://www.cs.rutgers.edu/~farach/