On Nov 1, 2011, at 19:23 , Justin Karneges wrote: > On Tuesday, November 01, 2011 05:16:43 AM Tuure Laurinolli wrote: >> Yes, you would get causal consistency with N=3, R=2, W=2. If client A, >> using some side channel, tells client B that it inserted something, it is >> guaranteed that client B can read it. > > Okay, good, this is how I understood it. > > I am curious now though how R > 1 works under the hood. Suppose we've got > the > above configuration (N=3, R=2, W=2) with server nodes X, Y, Z. If client A > writes to X and Y, and then, before the data propogates to Z, client B reads > from Y and Z, shouldn't the read operation fail because Y and Z don't agree > on > the same value? Or is it enough that Y has the latest value and this trumps > whatever was returned from Z? I'd think it must be the latter behavior for > causal consistency to work.
Yes, latest value read wins. _______________________________________________ riak-users mailing list [email protected] http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
