Tuesday, March 13, 2012

How Eventual is Eventual Consistency? Probablistic Bounded Staleness (PBS)

So I came across this article on eventual consistency on dzone and thought I'd pass it along. I comes from a Riak meetup from last month and talks about calculating what eventual consistency means on dynamo style systems. It's really quite interesting and comes with a link for a calculator. The idea is that if you switch from N=3, R=W=1 to N=2, R=2, N=1 system, how does that effect consistency and at what point in time could you reasonably expect your data to be perfectly consistent.

http://java.dzone.com/articles/nosql-weekly-how-eventual

and a link to the calculator

http://bailis.org/projects/pbs/#demo

Enjoy!

  - Craig

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