[ANN] Riak 2.0pre1

Elias Levy fearsome.lucidity at gmail.com
Mon Jan 20 15:35:05 EST 2014


On Mon, Jan 20, 2014 at 12:14 PM, Russell Brown <russell.brown at me.com>wrote:

> Longer answer: Riak gave users the option of client or _vnode_ ids in
> version vectors. By default Riak uses vnode ids. Riak erred on the side of
> caution, and would create false concurrency, rather than lose writes.
>

I am curious as to how that was accomplished when using vnode version
vectors.  As section 3.2 of the paper mentions, the node with concurrent
updates could detect they are concurrent and it could reject the update,
but how could you encode the causal history using the version vectors so as
to generate a sibling?  That section ends with a statement saying no such
version vector could be generated.

Presumably Riak implemented a version vector that is somewhat different
from that described in the paper?
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