Daniel, The ring size must be a power of two because it must evenly divide 2^160 (the size of our consistent hashing space), which is not divisible by 3. Using a non-power-of-two ring size will have unknown or unpredictable effects.
On Thu, Jan 19, 2012 at 3:51 AM, Daniel Iwan GM <iwan.dan...@gmail.com>wrote: > Hello riak users > > I'm trying to get my head around the partitioning in Riak > Quite recent thread was very helpful > > http://thread.gmane.org/gmane.comp.db.riak.user/6207/focus=6266 > > Let's say I install Riak on 3 nodes (initially), which will possibly > grow to 10 or more. > Default partition size is 64 and I store some data into bucket with n=2. > Does it mean that both copies of keys that are in 64th partition would > land on the same physical machine (node 1)? > From what I understood keys from 64th partition land in 1st partition > as well, which in that case would be on node1 > > If the answer is Yes, would it be better if I set the max ring size to > 72 which divides nicely by 3? > Basho wiki states that ring size should be power of 2. > Is there any performance impact of setting it to such a non-standard value? > > Or is there any better approach if I know that I will start with 3 > machines? > Apart from changing n to 3 of course. > > Thanks > D. > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > -- Sean Cribbs <s...@basho.com> Software Engineer Basho Technologies, Inc. http://basho.com/
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