Somehow, even though I've been following the 2.0 pre-releases fairly closely, I didn't catch the news about dotted version vectors:

> In Riak 2.0 and later, vector clocks can still be used for conflict resolution, but there is now the added option of using dotted version vectors (DVVs) instead.

http://docs.basho.com/riak/latest/theory/concepts/dotted-ver...