so would it make more sense to have the N=2? I'd like to be on the safe side, after reading "There are no guarantees that the three replicas will go to three separate physical nodes" in the replication docs I started to worry about the reliability of a 2 nodes N=2 setting.
On Fri, Jun 28, 2013 at 11:06 AM, Justin Sheehy <[email protected]> wrote: > Hi, Louis-Philippe. > > With a 2-node cluster and N=3, each value will be written to disk a total > of three times: twice on one node, once on the other. (The W setting has no > effect on the number of copies made or hosts used.) That behavior might > seem a bit strange, but it's a strange configuration to run Riak on only > two machines while asking it to store data on three of them. > > The standard settings and behavior of Riak are generally optimized for > non-tiny clusters, and make much more sense when there are at least five > machines. > > I hope this helps with your understanding. > > -Justin > > > > On Jun 28, 2013, at 10:54 AM, Louis-Philippe Perron wrote: > > > So if I get you right and extrapolate with the replication documentation > page, can I say that on a 2 nodes cluster, with a bucket set to N=3 and > W=ALL, my writes would be written 3 times to disk? (and with no guarantee > to be on different nodes)? > > > > thanks! > > > > On Wed, Jun 26, 2013 at 8:17 PM, Mark Phillips <[email protected]> wrote: > > Hi Louis-Philippe > > > > There are no dumb questions. :) > > > > On Wednesday, June 26, 2013, Louis-Philippe Perron wrote: > > Hi Riak people! > > Here is a dumb question, but anyway I want to clear this doubt out: > > > > What happens when a bucket has a W quorum value higher than the N number > of nodes? > > are writes to disk multiplied? > > > > > > Precisely. For example, if you run a one node Riak cluster on your dev > machine you'll be writing with a N val of 3 and W of 2 by default. In other > words, Riak will always attempt to satisfy the W value regardless of > physical node count. > > > > Hope that helps. > > > > Mark > > twitter.com/pharkmillups > > > > thanks! > > > > _______________________________________________ > > riak-users mailing list > > [email protected] > > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > >
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