[jdev] s2s implementation

[pablo platt]

There is still an uncovered point
where both servers have online users and they connect.


On Sat, Oct 30, 2010 at 3:31 PM, Sergey Dobrov <binary at jrudevels.org> wrote:

> On 10/30/2010 08:27 PM, pablo platt wrote:
> >
> >
> > On Sat, Oct 30, 2010 at 3:22 PM, Sergey Dobrov <binary at jrudevels.org
> > <mailto: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> <http://host1.com> on
> >     server1 has user1 at host1.com <mailto:user1 at host1.com>
> >     > <mailto:user1 at host1.com <mailto:user1 at host1.com>> and host2.com
> >     <http://host2.com> <http://host2.com> on server2 has
> >     > user2 at host2.com <mailto:user2 at host2.com> <mailto: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?
> remote-server-not-found or timeout error in presence if server will be
> down more than timeout value.
>
> > What if server1 is restarted, it won't know about online users in
> server2.
> When users on server2 will log in they will send probes and users on
> server 1 will inform about them statuses.
>
> >
> >
> >
> >     > 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.
> >
> I think it's enough.
>
> >
> >
> >     >
> >     > Thanks
> >     >
> >     >
> >     >
> >     >
> >     >
> >     >
> >     >
> >     >
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> >     > _______________________________________________
> >
> >
> >     --
> >     With best regards,
> >     Sergey Dobrov,
> >     XMPP Developer and JRuDevels.org founder.
> >
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> --
> With best regards,
> Sergey Dobrov,
> XMPP Developer and JRuDevels.org founder.
>
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