[jdev] s2s implementation

[Sergey Dobrov]

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.