IMHO you will want 4 cores and 4 to 8 GB for each VM to run both Cassandra and Hadoop on the nodes.
For comparison people often use an EC2 m1.xlarge which has 4 cores and 16GB. Also, I recommend anyone starting experiments with Cassandra and Hadoop use DataStax Enterprise. So you can focus on using Cassandra and Hadoop and not on installing Cassandra and Hadoop and HDFS and Hive etc. You can evaluate it in non production environments free of change http://www.datastax.com/what-we-offer/products-services/datastax-enterprise Once you know if Cassandra and Hadoop is where you want to go, then dig into the installation side of things. Hope that helps. ----------------- Aaron Morton Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 18/07/2013, at 3:42 AM, Martin Arrowsmith <arrowsmith.mar...@gmail.com> wrote: > Even if we have one machine, will splitting it up into 2 nodes via a VM make > a difference ? > Can it simulate 2 nodes of half the computing power ? Also, yes, this will > just be a test playground > and not in production. > > Thank you, > > Martin > > > On Mon, Jul 15, 2013 at 1:56 PM, Nate McCall <zznat...@gmail.com> wrote: > Good point. Just to be clear - my suggestions all assume this is a > testing/playground/get a feel setup. This is a bad idea for > performance testing (not to mention anywhere near production). > > On Mon, Jul 15, 2013 at 3:02 PM, Tim Wintle <timwin...@gmail.com> wrote: > > I might be missing something, but if it is all on one machine then why use > > Cassandra or hadoop? > > > > Sent from my phone > > > > On 13 Jul 2013 01:16, "Martin Arrowsmith" <arrowsmith.mar...@gmail.com> > > wrote: > >> > >> Dear Cassandra experts, > >> > >> I have an HP Proliant ML350 G8 server, and I want to put virtual > >> servers on it. I would like to put the maximum number of nodes > >> for a Cassandra + Hadoop cluster. I was wondering - what is the > >> minimum RAM and memory per node I that I need to have Cassandra + Hadoop > >> before the performance decreases are not worth the extra nodes? > >> > >> Also, what is the suggested typical number of CPU cores / Node ? Would > >> it make sense to have 1 core / node ? Less than that ? > >> > >> Any insight is appreciated! Thanks very much for your time! > >> > >> Martin >
