John, Eric, thank you for your answers. I understood that running Riak on one node is a bad idea. But having 5 nodes in cluster is too expensive for us right now. Which settings I have to tune to get a decent performance on 3 node cluster? 100% availability is not necessary for us but small response time of get requests is "must have". I think I can set n_val=2, r=1 and w=1 to achieve this. Is there something else?
On 10 June 2013 20:25, Eric Redmond <eredm...@basho.com> wrote: > Alexander, > > The simplest answer is that we never recommend running Riak on one node. > The recommended minimum is 5, but you could possibly get away with 3 (the > default repl value). > > There is a blog post about this from last year, explaining why: > http://basho.com/why-your-riak-cluster-should-have-at-least-five-nodes/ > > Eric > > On Jun 10, 2013, at 9:01 AM, Alexander Ilyin <alexan...@rutarget.ru> > wrote: > > Hi all, > > I have a question regarding setting the n_val. > In the documentation ( > http://docs.basho.com/riak/latest/tutorials/fast-track/Tunable-CAP-Controls-in-Riak/) > it is stated that: > > n_val must be greater than 0 and less than or equal to the number of > actual nodes in your cluster to get all the benefits of replication. > And, we advise against modifying the n_val of a bucket after its initial > creation as this may result in failed reads because the new > value may not be replicated to all the appropriate partitions. > > But this seems contradictory to me. Which value I have to set if I'm > setting up one node right now but planning to add second one later? > Setting n_val=2 means this value will be greater than actual number of > nodes. But setting n_val=1 is also not advisable since > I will have to change it later to n_val=2 (I'm planning to have two > replicas in the end). > > I'm also concerned about the performance in case of one node and n_val=2. > Will it degrade since both replicas are stored on the same server? > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > >
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