This does not currently exist; look at the recent discussion. This is a proposed GSoC Hbase support project, but it was rejected on the basis that the mongoDB project was developed last year and has not yet been added to the trunk. Hbase baackend works in a completely different way than the Django ORM design, there is not a minute in short-term support, and any support for non-relational db is unlikely to hit the core any time soon.