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From Gary Helmling <ghelml...@gmail.com>
Subject Re: HBase and Cassandra on StackOverflow
Date Wed, 31 Aug 2011 18:21:00 GMT
> Since this is fairly off-topic at this point, I'll keep it short. The
> simple
> rule for Dynamo goes like this: if (R+W>N && W>=Quorum), then you're
> guaranteed a consistent result always. You get eventual consistency if
> W>=Quorum. If W<Quorum, then you can get inconsistent data that must be
> detected/fixed by readers (often using timestamps or similar techniques).
> Joe is right, enforcing (W=3, R=1, N=3) on a Dynamo system gives the same
> (provably identical?) behaviour as HBase, with respect to consistency.
For those interested in a comparison of the consistency behavior, there's an
older, but really excellent thread on quora with detailed analysis:

Don't miss the last answer in the the thread.  It's unfortunately collapsed
due to some quora policy, but it contains some of the best details.

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