Re: Riak 2 Node cluster

[Nico Huysamen]

Hi Eric Yeah, that was exactly what I thought. All things considered though, the 4GB RAM requirements is only an recommendation correct? For example, if we do not expect very high volumes of key/value pairs in our application initially (probably around 3-5 million), then would the 5x 2GB RAM VPS server cluster be a viable option until the volumes grow? The Bitcask calculator seems to think that for our setup (5 million keys, 10 byte bucket, 42 byte keys, 1024 byte values, n=3) we only need about 270MB RAM on each node. That seems to leave ample space for map reduce functions etc. Or am I missing the point here? (Apologies, fairly new to Riak). Regards, -- Nico Huysamen Eric Redmond 15 August 2013 3:27 PM It's hard to answer that, because both configurations are below Riak's recommended specifications. You should have at least 5 servers, and they should have at least 4GB RAM each. The minimums are for different reasons. The minimum RAM is clear: keeping things like keys resident reduces the chances of disk swap, which can destroy any database. The minimum 5 nodes is because the major reason for using Riak is high availability. If you don't have a good distribution of objects across several physical machines, you are less able to deal with any particular one going down. If you only have two servers, you really can't survive a single outage. Any less than 4 makes the odds that a value is replicated multiple times on the same machine quite high, so we recommend 5 since you can at least handle 1 downed node. Eric Nico Huysamen 15 August 2013 1:42 PM I am also interested in the answer to this. If I had to choose between having 2 dedicated servers, each with 32GB RAM, or 5 virtual servers each with 2GB RAM (which just happens to be the case for us at the moment), my gut feel is go with the 2 dedicated servers. But Basho seems pretty fixed on having at least 5 nodes. Would a 2 node system be viable? Regards, Баканов Дмитрий 12 August 2013 4:32 PM Hello, I need to decide what database we will choose for our project. Certainly, we need only 2 physical nodes (active-standby). Riak is good for us, becase it is Erlang-based, as our project. But is's known that riak cluster should have at least five nodes. I have some problems with my cluster, same as in this E-mail: http://lists.basho.com/pipermail/riak-users_lists.basho.com/2012-March/007988.html Could you cleraly explain, please, is it possible to tune riak to work correctly with only 2 physical nodes, or we need to choose another DBMS? Dmitry _______________________________________________ riak-users mailing list riak-users@lists.basho.com http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com

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