[erlang-questions] Re: Erlang-based opensource publish-subscribe servers
Wed Oct 27 15:42:32 CEST 2010
But then, why not pg2 ? It says:
"In pg, each message is sent to all members in the group. In this module,
each message may be sent to one, some, *or all members*. "
With the option of sending to all-members, it looks like something that is
quite similar to pg, and isn't tagged "experimental" and also more proven
thanks to it being used in the disk_log module !!
On Wed, Oct 27, 2010 at 6:40 PM, Zvi <> wrote:
> Just found about pg module (not pg2).
> Looks like it can be used to implement pubsub.
> For each topic create process group (pg:create/1), then each
> subsriber's process joins topic's process group (pg:join/2).
> Publish maps cleanly to pg:send/2.
> Any ideas, why not to use this module?
> I guess process groups use registered names, so that's a
> Another problem is, that docs call this module "experimental".
> On Oct 24, 9:22 pm, "Zvi ." <> wrote:
> > no,
> > I need something lightweight, but able to work in a large cluster (10s of
> > nodes).
> > The ideas I have:
> > 1. Use ets to store mappings of Subscriber Pids to TopicIDs - this ets
> > obviously be a bottleneck.
> > 2. Have a process per TopicID, which hold list of all it's Subscriber
> > in it's state. Now the bottleneck is mapping TopicID to it's Pid
> > 3. Use Ulf's gproc (looks it uses gen_leader abd requires patching
> > I currently working on 1.
> > Zvi
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