Looking quickly at the code myself:

> - The API supports GET/PUT/DELETE (no range queries).

There are range query on keys:

# list keys starting with "we" curl -v -L localhost:3000/we?list

> - There's no handling of errors from the volume servers

If a GET/PUT/DELETE fails it is communicated to the master server, who doesn't write anything in its own database

All in all I believe it does quite a lot for less than 1000 lines already. Knowing its limitations I'm curious to see how well it handles production usage