As others said, depends on load and traffic and all sorts of thins.
if you want a number, 4Gb would me a reasonable minimum IMHO. (You may get by
with less). 8Gb is about the tops.
Any memory not allocated to Cassandra will be used to map files into memory.
If you can get machines with 8GB
expensive :-) I was expecting to start with 2GB nodes, if not 1GB for
intial.
On Thu, Mar 1, 2012 at 3:43 PM, aaron morton aa...@thelastpickle.comwrote:
As others said, depends on load and traffic and all sorts of thins.
if you want a number, 4Gb would me a reasonable minimum IMHO. (You may
For Cassandra testing I am using a very old server with a one core
Celeron processor and 1GiB RAM, and another one with 4GiB and 4 cores,
both with two consumer SATA hard disks. Both works, i.e. there is no out
of memory error etc. There are about 10 writes and reads per second,
maybe more,
Depends on your traffic :-)
cassandra-env.sh will try to allocate heap with following formula if
you don't specify MAX_HEAP_SIZE.
1. calculate 1/2 of RAM on your system and cap to 1024MB
2. calculate 1/4 of RAM on your system and cap to 8192MB
3. pick the larger value
So how about to start with
@Aaron: Are you suggesting 3 nodes (rather than 2) to allow quorum
operations even at the temporary loss of 1 node from cluster's reach ? I
understand this but I just another question popped up in my mind, probably
since I'm not much experienced managing cassandra, so I'm unaware whether
it may be
If you have 3 nodes of RF=3, you can continue the service on cassandra even if
one of the node will fail ( by hardware or software failure ).
One other benefit is you can shutdown one node for maintenance or patch up
without service interruption.
If you run your service with 2 node and RF=2, your
If you run your service with 2 node and RF=2, your data will be replicated but
your service will not be redundant. ( You can't stop both of nodes )
If your service doesn't need strong consistency ( allow cassandra returns
old data after write, and possible write lost ), you can use CL=ONE
for
Thanks, I think I don't need high consistency(as per my app requirements)
so I might be fine with CL.ONE instead of quorum, so I think I'm probably
going to be ok with a 2 node cluster initially..
Could you guys also recommend some minimum memory to start with ? Of course
that would depend on my
Hi
I'm creating an networking site using cassandra. I am wanting to host this
application but initially with the lowest possible resources then slowly
increasing the resources as per the service's demand need.
*1. *I am wandering *what is the minimum recommended cluster size to start
with*?
I guess the issue with 2 machines and RF=2 is that Consistency level of QUORUM
is the same as ALL, so you've pretty much have little flexibility with this
setup, of course this might be fine depending on what you want to do. In
addition, RF=2 also means that you get no data-storage improvements
1. I am wandering what is the minimum recommended cluster size to start with?
IMHO 3
http://thelastpickle.com/2011/06/13/Down-For-Me/
A
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 28/02/2012, at 8:17 AM, Ertio Lew wrote:
Hi
I'm
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