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In my view a cell should only know about the queue it's connected to, and
let the 'global' message queue to do its job of dispatching the messages to
the right recipient: that would solve the problem altogether.

Were federated <http://www.rabbitmq.com/federation.html> queues and topic
routing<http://blog.springsource.org/2011/04/01/routing-topologies-for-performance-and-scalability-with-rabbitmq/>not
considered fit for the purpose? I guess the drawback with this is that
it is tight to Rabbit.

On Mon, Jun 17, 2013 at 2:14 AM, Mark McLoughlin <markmc at redhat.com> wrote:

> On Fri, 2013-06-14 at 12:41 -0700, Chris Behrens wrote:
> > On Jun 13, 2013, at 11:26 PM, Mark McLoughlin <markmc at redhat.com> wrote:
> >
> > > Is there any reason not to just put it in nova.conf as transport URLs?
> > >
> > > (By nova.conf, I mean cfg.CONF for nova which means you could happily
> do
> > > e.g. --config-file nova-cells.conf too)
> >
> > The issue with using cfg.CONF is that we need the same config options
> > for each cell.  So, I guess you'd have to dynamically create the
> > config groups with cell name as the group name… and have some sort of
> > global option or an option in a different config group that specifies
> > the list of cells.  I think it just gets kinda nasty.  But let me know
> > if I'm missing a good way to do it.  It seems like JSON is going to be
> > a little more flexible. :)
>
> I don't know whether I like it yet or not, but here's how it might look:
>
>  [cells]
>  parents = parent1
>  children = child1, child2
>
>  [cell:parent1]
>  transport_url = qpid://host1/nova
>
>  [cell:child1]
>  transport_url = qpid://host2/child1_nova
>
>  [cell:child2]
>  transport_url = qpid://host2/child2_nova
>
> Code for parsing that is:
>
>  from oslo.config import cfg
>
>  cells_opts = [
>      cfg.ListOpt('parents', default=[]),
>      cfg.ListOpt('children', default=[]),
>  ]
>
>  cell_opts = [
>      cfg.StrOpt('api_url'),
>      cfg.StrOpt('transport_url'),
>      cfg.FloatOpt('weight_offset', default=0.0),
>      cfg.FloatOpt('weight_scale', default=1.0),
>  ]
>
>  conf = cfg.CONF
>  conf(['--config-file=cells.conf'])
>  conf.register_opts(cells_opts, group='cells')
>
>  def get_cell(conf, name):
>      group_name = 'cell:' + name
>      conf.register_opts(cell_opts, group=group_name)
>      return conf[group_name]
>
>  for cell in conf.cells.parents + conf.cells.children:
>      print cell, get_cell(conf, cell).items()
>
>
> Ok ... I think I do like it :)
>
> Cheers,
> Mark.
>
>
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