To add to Ian's comment, for me personally, this specific characteristic is in fact a very important distinguishing feature of Riak vs other scalable KV systems. To me, this is what separates
My understanding is that Riak borrows this from Dynamo which talks about "decentralization" - master nodes often times are a cause of bottlenecks and/or single point of failure for certain operations. Vishal On Jan 11, 2012, at 8:39 AM, Ian Plosker wrote: > Les, > > In Riak, there is no single primary copy considered the canonical version. > For each key, there will be N (3 by default) partitions responsible for > storing the associated value. In effect, there are N primaries for any key. > This is how Riak makes its availability guarantees, as well as why "absolute > consistency" is difficult. > > -- > Ian Plosker <i...@basho.com> > Developer Advocate > Basho Technologies, Inc. > On Tuesday, January 10, 2012 at 10:09 PM, Les Mikesell wrote: > >> On Tue, Jan 10, 2012 at 8:52 PM, Justin Sheehy <jus...@basho.com> wrote: >>> >>> On Jan 10, 2012, at 9:42 PM, Les Mikesell wrote: >>> >>>> How do things like mongo and elasticsearch manage atomic operations >>>> while still being redundant? >>> >>> Most such systems use some variant of primary copy replication, also known >>> as master/slave replication. >>> >>> That approach can provide consistency, but has much weaker availability >>> properties. >> >> Doesn't riak need some kind of partition owner/master concept to >> control migration? And if it has that, why can't the client request >> that an operation happens on the partition owner/master first for >> things that need consistency? >> >> -- >> Les Mikesell >> lesmikes...@gmail.com >> >> _______________________________________________ >> riak-users mailing list >> riak-users@lists.basho.com >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com > > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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