[Standards] Council on Stanza Repeaters without Multicast

Dave Cridland dave at cridland.net
Fri Apr 4 09:35:08 UTC 2008


On Fri Apr  4 09:16:34 2008, Pedro Melo wrote:
> 
> On Apr 3, 2008, at 10:40 PM, Alexander Gnauck wrote:
>> Carlo v. Loesch schrieb:
>>> Yes, that's why I started thinking about something better in 1990.
>>> I understood there was no way for IRC to be 'fixed' because its   
>>> design
>>> is fundamentally flawed. XMPP is only syntactically flawed, which  
>>> is
>>> a much better starting point. And you can argue that's just my   
>>> opinion.
>>> That's ok. Still IRC does multicast, and XMPP is still missing  
>>> that,
>>> and Pedro is the kind of person who can see the impact of that   
>>> each day.
>> 
>> I also see this impact. With the situation we have *today* I agree  
>>  with Dave that we don't save much traffic and stanzas with   
>> repeaters. There is nearly no PubSub usage at all today, and in  
>> the  most Muc rooms we have only 5-30 participants. If I look at  
>> the  participants of jdev today than the most users have local   
>> jabber.org Jids, and max. 2 or 3 participants are on the same   
>> federated server. People join and leave, so there will be a tie   
>> between the stanzas we save in the repeater and the overhead to   
>> maintain the distribution list in the repeater.
> 
> A quick data-point: the largest pubsub node *right now*, has a bit   
> over 73000 (73056 to be exact) subscribers, the top 3 are all above  
>  72k. And this service is only for local users of the server.
> 
> 
To state the obvious (which I'm sure you know), nothing's going to  
help this case...


> [OT] And yes, even now, with only local users, we see a bit spike  
> in  ejabberd when we have a new notification. This is a old version  
> of  ejabberd and we are using a component connection, I'm sure that  
> if we  move this to angie in 2.x we will improve a bit.

... unless you ran a repeater over the component link, of course,  
which might work. Or might not - but a component protocol might need  
this sort of thing.

Dave.
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