In my company, we tested FDB for two years, then we wrote a new backend for Warp 10 timeseries database... Performances are really impressive, we dropped HBase backend when we released Warp 10 3.0. Note we can isolate customers easily on the same FDB cluster (tenants are not explained anywhere on internet, it is a quite recent FDB feature).

more info: https://blog.senx.io/introducing-warp-10-3-0/