I'm not sure about the optimal use-case match. Sparkey is for "mostly static" datasets where on disk structures are generated by a batch process and pushed to s

I'm not sure about the optimal use-case match. Sparkey is for "mostly static" datasets where on disk structures are generated by a batch process and pushed to servers providing read only access to the data to consumers. leveldb on the other hand, supports concurrent writes and provides features to handle data consistency and cheap gradual reindexing.