Re: Perdition and mass migration

On Tue, Mar 30, 2010 at 12:48:19AM -0300, Raul Dias wrote:
> Em 29-03-2010 18:58, Simon Horman escreveu:
> > On Mon, Mar 29, 2010 at 01:02:43PM -0300, Raul Dias wrote:
> >    
> > 2 - --outgoing_server* *SERVER_A,SERVER_B*
> >> *
> >>           It was not clear yet, how will --outgoing_server works.*
> >>
> >> *        On each connection it will connect to one of ther servers
> >> only.  Is that it?
> >>           If so, whats the advantage?
> >> *
> >> *        Or will it connect to both servers and retrieve messages from
> >> both? (what I need)
> >>           I understand that on a imap server this is not so easy, but on
> >> pop3 doent seems to be a big challenge.
> >>
> >>           If this is not how it works?  Is there something that could be
> >> done achieve this behaviour?
> >>      
> > As it stands perdition only connects to one real-server.
> > If more than one real-server is supplied using the outgoing_server
> > option then those real servers are tried in order. Though
> > there is a (very simple) round-robin algorithm that selects which
> > one to try first.
> >
> > Could you describe in a little more detail what you need to achieve
> > with two mailboxes? It may be possible to enhance perdition in order
> > to meet your needs.
> >    
> As I said before, I am about to start a mass migration of thousands 
> accounts (pop3)
> that might take a really long time.

Understood.

> Before knowing Perdition, my plan was to write a pop3 proxy (have done
> that in the past) that monitors if an account has been transferred or not
> and points to the right server (new/old).

I have made some one-off customisations to perdition in the past
to do things like this. If you are interested I'd be happy
to talk over what something that does this in a generic way
that could be merged into the main code might look like.

> What I wish that Perdition would do with two mailboxes was to simulated
> them as one. So, that if there are 4 messages in server A and 10 in
> server B, the client would see them as one server with 14 messages.
> Probably there will be some uid issues to resolve.

I believe that Cyrus murder allows merging of mailboxes,
but I'm not familiar with the details.

> I was hoping that this would be what that option do.  I really don't see 
> a point in using a round
> robin server select for imap/pop3 in real world.

Good point. I believe that it was added because someone had a use for
it at some point. But I don't recall what that was.

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