<div dir="ltr"> <div class="gmail_quote">On Sat, Oct 30, 2010 at 3:22 PM, Sergey Dobrov <<a href="mailto:binary@jrudevels.org">binary@jrudevels.org</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div class="im">On 10/30/2010 08:00 PM, pablo platt wrote: > Hi > > I understand that xmpp federation is similar to mail servers. > There is some kind of verification and stanzas are sent in a fire and > forget way. > A server doesn't need to keep track of the presence of users from other > servers > or other kind of distributed state except for the actual connection. > > I couldn't find info about how to handle failures. </div>> Let's say <a href="http://host1.com" target="_blank">host1.com</a> <<a href="http://host1.com" target="_blank">http://host1.com</a>> on server1 has <a href="mailto:user1@host1.com">user1@host1.com</a> > <mailto:<a href="mailto:user1@host1.com">user1@host1.com</a>> and <a href="http://host2.com" target="_blank">host2.com</a> <<a href="http://host2.com" target="_blank">http://host2.com</a>> on server2 has > <a href="mailto:user2@host2.com">user2@host2.com</a> <mailto:<a href="mailto:user2@host2.com">user2@host2.com</a>> <div class="im">> user1 and user2 has each other on their rosters. > user1 is already logged in and now user2 is logging in and sending a > presence stanza. > host2 pass the presence stanza to host1 with the to attribute and a > presence probe. > host1 pass the presence to user1 and respond with user1's presence. > host1 doesn't remember that user2 is online and the opposite. > > 1.server2 has a power failure and it is back up in few minutes. > Does host2 need to send offline presence for all its users to hsot1? > </div>No, If user is offline too long, user will see remote-server-timeout error if it sent any stanza to him. <div class="im"> > 2. server2 is running but the connection to server1 is lost for few minutes. > When the connection is back, the online users are not in sync. > How do I handle this situation? > </div>TCP gives you a guarantee that data will be delivered to a recipient. This problem is occured only if connection was down too long. And the answer is the same such 1. </blockquote><div> What about users that logged in when server2 was down? What if server1 is restarted, it won't know about online users in server2. </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div class="im"> > 3. When host1 sends a stanza to a user on host2 that is offline, > does host2 respond with an error? > </div>It's related on stanza kind and server's settings. If you send a message you will store it in the offline storage for example. But if you send iq stanza to a full jid server will return service-unavailable error. <div class="im"> > Is there a doc explaining s2s implementation? </div>RFC 3920 </blockquote><div> RFC 3920 is too general I think that a section dedicated to all aspects of s2s will be very helpful. </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> > > Thanks > > > > > > > > > _______________________________________________ > JDev mailing list > Forum: <a href="http://www.jabberforum.org/forumdisplay.php?f=20" target="_blank">http://www.jabberforum.org/forumdisplay.php?f=20</a> > Info: <a href="http://mail.jabber.org/mailman/listinfo/jdev" target="_blank">http://mail.jabber.org/mailman/listinfo/jdev</a> > Unsubscribe: <a href="mailto:JDev-unsubscribe@jabber.org">JDev-unsubscribe@jabber.org</a> > _______________________________________________ -- With best regards, Sergey Dobrov, XMPP Developer and JRuDevels.org founder. _______________________________________________ JDev mailing list Forum: <a href="http://www.jabberforum.org/forumdisplay.php?f=20" target="_blank">http://www.jabberforum.org/forumdisplay.php?f=20</a> Info: <a href="http://mail.jabber.org/mailman/listinfo/jdev" target="_blank">http://mail.jabber.org/mailman/listinfo/jdev</a> Unsubscribe: <a href="mailto:JDev-unsubscribe@jabber.org">JDev-unsubscribe@jabber.org</a> _______________________________________________ </blockquote></div> </div>