Any way to force "garbage collection" in TokuDB? Playing around with TokuDB I'm finding even after "optimize table" for things such as changing row compression or other DDLs it takes a non deterministic amount of time for freed space to be reflected in the file system.

Is there anyway to force this more immediately or otherwise view status of if the clean up is in progress or otherwise scheduled?
Have you simply tried "mysql> show processlist;"? TokuDB displays the progress of optimize operations in plain view.