[jdev] s2s implementation

[pablo platt]

On Sat, Oct 30, 2010 at 3:22 PM, Sergey Dobrov <binary at jrudevels.org> wrote:

> 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.
> > Let's say host1.com <http://host1.com> on server1 has user1 at host1.com
> > <mailto:user1 at host1.com> and host2.com <http://host2.com> on server2 has
> > user2 at host2.com <mailto:user2 at host2.com>
> > 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?
> >
> No, If user is offline too long, user will see remote-server-timeout
> error if it sent any stanza to him.
>
> > 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?
> >
> 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.
>


What about users that logged in when server2 was down?
What if server1 is restarted, it won't know about online users in server2.


>
> > 3. When host1 sends a stanza to a user on host2 that is offline,
> > does host2 respond with an error?
> >
> 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.
>
> > Is there a doc explaining s2s implementation?
>
> RFC 3920
>

RFC 3920 is too general
I think that a section dedicated to all aspects of s2s will be very helpful.



> >
> > Thanks
> >
> >
> >
> >
> >
> >
> >
> >
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>
> --
> With best regards,
> Sergey Dobrov,
> XMPP Developer and JRuDevels.org founder.
>
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