TokuFT is fairly draconian about closing and dropping dictionaries, and about shutting down while things are still open.

Attached are two patches:

1) During a clean shutdown, close all databases (which in turn will close all dictionaries) before closing the environment.
2) Before dropping a collection, close the record store backing it, because TokuFT complains if you drop an open dictionary.

These patches are part of https://github.com/mongodb/mongo/pull/834, this ticket is mostly to explain the issue and have a record of it.