[Serusers] Carrier-grade framework for SER

[Juha Heinanen]

Andreas Granig writes:

 > Or do you mean something like
 > 
 >    forward_tcp("foohost", "5060");
 >    forward_tcp("barhost", "5060");
 > 
 > and on the receiving hosts
 > 
 >    if(/* register from replicating host */)
 >      save_noreply("location");
 > 
 > which would be a possibility, indeed...

this is what i meant.

 > I think mode 1 (Write-Through) should be used because the SER could 
 > start up while some of the contacts aren't flushed to DB yet.

yes, my error.  i didn't remember which mode number was write-through.

 > However, how would you set up your database connections here? Using a 
 > common usrloc database for all hosts (-> single point of failure)? This 
 > is the main point. _How_ do you share the contacts as reliable as 
 > possible so that a host can go down for a while without getting out of 
 > synch regarding the contacts?

that is database replication problem.  i'm pretty sure that mysql ab has
a solution for it if it is not included in the freely available 4.1
release.

-- juha