[MariaDB discuss] Rocksdb as a replacement for toku?

Hi Guys, i'm looking for tokudb replacement and i'm again thinking about rocksdb. Is it mature enough to be used as an engine for statistical tables (several billions rows, around 2TB in size?). - Is it (will it be?) possible to have something like single-file-per-table (or single dir per table?) - Is it shared per all tables, so all tables are still using single set of files (can single crashed table/row lead to all tables being unusable?) - Will partitioning the table have performance benefits like with other engines? Can I do instant TRUNCATE PARTITION for easy data retention? Thanks