Hi EricYeah, 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 PMIt'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 PMHello,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.htmlCould
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
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