One practical consequence for the XML stream is a separate <presence>
Stanza is sent from the server to the client for each contact. I have
To check the karma code to see if the client connection's karma is charged
For this traffic.
500 contacts means 500 <presence> stanzas, each one being something like 150 bytes longs (payload, not including Ethernet, TCP and IP headers, call it 200 bytes in round numbers). So we get 5 contacts per 1kB on the Wire or 100kB, which is 800kb on the wire. Rather heavy duty. ;( But there
Does not appear to be any choice at this time....so dribbling the presence
Data out to the client over some time period appears to be desireable.
Although 1 stanza is not necessarily 1 ethernet packet, and 800KB is not much on a LAN for example.
Do you have a real-life application in mind where such large rosters would be used with frequent enough login/logouts to be an issue?
Another possibility for addressing this case efficiently is stream compression - http://www.jabber.org/jeps/jep-0138.html
Regards Stephen
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