Re: [xmpp] 3921bis: probe + unavailable

[Jonathan Schleifer <[e-mail]>]

Am 30.01.2010 um 23:29 schrieb Jonas Lindberg:

> While I agree this would simplify the protocol a little, I am not  
> convinced it is a change worth making.
>
> First of all, not responding to probe when unavailable is a pretty  
> good optimization. A large part of Xmpp traffic is presence. This  
> change would further significantly increase the presence traffic,  
> making scaling more challenging and adding load to c2s and s2s  
> connections. For example, a cell phone xmpp client may be better off  
> not getting potentially thousands of presence unavailable stanzas  
> for offline friends when connecting over gprs.
>
> I'm also not convinced this change make it significantly easier to  
> implement xmpp clients/servers. Especially if we are going to  
> recommend that clients and servers SHOULD cope with no response for  
> legacy reasons.

I think you got something wrong here: We are not talking about what  
happens when you connect. We are talking about presence probes sent  
from one client to a server. A mobile client would not get any  
unavailable presence more than it would get now, expect it requests it  
by doing a probe.

--
Jonathan