Author of Badger here. Our design of separating keys and values has gotten us incredibly fast writes, while still keeping the read latencies neck-to-neck against B+ trees. Worth checking out: https://github.com/dgraph-io/badger
Badger looks nicely done! Did you end up needing to change much in implementing Badger from what was described in the WiscKey paper?
Badger is really good, i'm using it.
This looks very interesting. Do you have any builtin compression or tips on compressing data?