[rabbitmq-discuss] Cluster size limit

[Advait Alai]

>
> However - RabbitMQ clustering is not designed as a way to create
> pubsub overlays for the wide area.  Its primary goal is scalability of
> one broker by adding nodes on the same LAN.  This is for, eg, cases
> where the number of subscriptions (or "bindings") on the broker grows
> beyond what one machine can physically cope with.
>
> Now, this does not stop you wiring up 1,000s of RabbitMQ brokers.  But
> using RabbitMQ clustering is the wrong way to do that.  Can you tell
> us a bit more about the pubsub topology you want to study, please?
> That may help us suggest the optimal way to solve your problem..
>

The topology looks like this: http://imgur.com/8iep0 (taken from
http://ctieware.eng.monash.edu.au/twiki/bin/view/Simulation/LargePacket-switchingNetworkTopologies
)

The terminal nodes shown in the topology are either publishers or
subscribers, and I want RabbitMQ to run as a middleware over the entire
network. The network (routers and links) are simulated by NS3, So it is
essentially a set of point to point links, where each link is a separate
network. The terminal nodes are VMs (that would run the amqp/rabbitmq
scripts) which I am attempting to cluster so they can use a common set of
queues and exchanges. So all terminal nodes are in different LANs.

Also, can you explain why QoS studies require the study of 1,000s of
> nodes?  Perhaps you mean 1,000s of clients?
>

I'm not sure I understood -- I'm trying to provide high fidelity results, so
I thought the testbed should be atleast of the same order of size as the
network on which it needs to be deployed (>50000 nodes). There are a few
strict IEEE standards regarding this network that specify the minimum QoS
guarantees required.

Is there an easier way to do this?

Thanks

On Sun, Mar 27, 2011 at 7:11 PM, Advait Alai <advaitalai at gmail.com> wrote:
> > Thanks for the reply --
> > On Sun, Mar 27, 2011 at 9:38 PM, Jerry Kuch <jerryk at vmware.com> wrote:
> >>
> >> 150 is a pretty big sounding cluster...  Out of curiosity, what's
> >> motivating you to go so big (if you don't mind saying)?
> >
> > I am doing a QoS analysis of publish-subscribe overlays using RabbitMQ in
> > wide area networks (These are country wide networks, so even a 1000 nodes
> > might be insufficient :-)) So stuff like packet delay, loss, out-of-order
> > delivery etc.
> >
> >>
> >> On that note, because RabbitMQ clustering is based on Erlang
> distribution,
> >> the current practical limit you'll probably run up against is somewhat
> lower
> >> than the 150 you have in mind.  Something more like 32 to 64.
> >
> > Is there a configuration that would let me scale to >64 nodes, even if it
> > would not be practical? And in case Erlang does not scale well, I'll
> > probably have to resort to entirely another middleware -- any suggestions
> > that would work on a larger number of nodes?
> >
> >>
> >> If you can say more about your goals it's likely that someone on the
> >> Rabbit team can suggest something helpful.
> >
> > The analysis I'm carrying out on >100 nodes is actually on a single
> system.
> > These 'nodes' are actually many light weight linux containers (more or
> less
> > virtual machines) connected by a simulated NS3 network topology. But I
> doubt
> > this would be the cause of the clustering problem, as <50 nodes were
> > clustering without any difficulty.
> >
> >>
> >> On Mar 26, 2011, at 10:32 PM, "Advait Alai" <advaitalai at gmail.com>
> wrote:
> >>
> >> > Hi,
> >> >
> >> > I'm trying to add 150 nodes to a RabbitMQ cluster. After around 50
> >> > nodes, the stop-reset-cluster-start iteration starts giving the error:
> >> >
> >> > Stopping node rabbit at node130 ...
> >> > ...done.
> >> > Resetting node rabbit at node130 ...
> >> > ...done.
> >> > Clustering node rabbit at node130 with [rabbit at node117] ...
> >> > ...done.
> >> > Starting node rabbit at node130 ...
> >> > Error: {cannot_start_application,rabbit,
> >> >            {bad_return,
> >> >                {{rabbit,start,[normal,[]]},
> >> >                 {'EXIT',{rabbit,failure_during_boot}}}}}
> >> >
> >> > Note that I am sequentially adding nodes to build a cluster (as an
> >> > initialization step) before creating any queues/exchanges or running
> any
> >> > amqp script.
> >> >
> >> > How do I solve this problem? Is it because RabbitMQ imposes a hard
> >> > cluster size limit?
> >> >
> >> > Also, does RabbitMQ scale well to around 1000 nodes?
> >> >
> >> > Thanks
> >> > _______________________________________________
> >> > rabbitmq-discuss mailing list
> >> > rabbitmq-discuss at lists.rabbitmq.com
> >> > https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss
> >
> >
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> >
> >
>
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