Another question about MUPDATE server

[Etienne Goyer]

Thanks Rob for your answer so far.  Concerning the replication process,
we where thinking about using something like heartbeat to monitor the
service.  Once the master has been found inoperative, heartbeat should
promote one of the replica as master, by running a script to restart the
replica in server mode for example.

You mention consistancy issue.  What could these be ?  If it would be
about changes not having been pushed to the replica, a work-around would
be to recreate the MUPDATE database (?) from scratch from the backend
(but this might be too prohibitive in wall clock time).

Does that make sense ? Again, thank you for your input.
 
On Fri, Feb 21, 2003 at 11:59:25AM -0500, Rob Siemborski wrote:
> On Fri, 21 Feb 2003, Etienne Goyer wrote:
> 
> > I would have another question concerning MUPDATE.  The white-paper on
> > Cyrus imapd Murder hinted about the possibility(1) of having your MUPDATE
> > server replicating.  If it is available, I would like to replicate the
> > MUPDATE server for both scalability and automatic failover, somewhat
> > like what is possible with OpenLDAP using slurpd.  Is this part of Cyrus
> > imapd current distribution or planned for future developpement ?
> 
> The whole point of mupdate is the replication, so this is definately
> present in the current code.  It won't give you any automatic failover
> though since there is only one mupdate master.
> 
> There are some consistancy issues with using the slaves as authoritative
> sources, however.
> 
> Presumably, work could be done to make the database more of a traditional
> replicated database (akin to ubik), but we didn't have an immediate need
> for that, so simplicity was prefered.
> 
> -Rob
> 
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Rob Siemborski * Andrew Systems Group * Cyert Hall 207 * 412-268-7456
> Research Systems Programmer * /usr/contributed Gatekeeper

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Etienne Goyer                    Linux Québec Technologies Inc.
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