Re: Mirror Mode, MMR and replicas

[Quanah Gibson-Mount <quanah@zimbra.com>]

--On Wednesday, March 18, 2009 10:18 PM +0100 Rein Tollevik 
<rein@OpenLDAP.org> wrote:

> Quanah Gibson-Mount wrote:
> > --On Wednesday, March 18, 2009 3:01 AM -0700 Howard Chu <hyc@symas.com>
>
> > > > I'll start with replication under MMR.
> > >
> > > > As I understand it, the replicas can only point at a single master.
> > >
> > > False.
> >
> > Last I checked, the provider parameter in the syncrepl configuration
> > block was single valued.  Which means either it gets pointed at a load
> > balancer, or it only talks to a single master.  If that master goes
> > down, it no longer talks to anything without reconfiguration.
>
> Each syncrepl engine (configuration block) can only refer to a single
> master, but you may configure many engines within the same database, each
> with its own master.  If one master goes down the engine using that
> master will obviously not receive any updates until its master is up
> again, but the other will continue to receive updates from their master.

Ok, this was the point I didn't realize -- That syncrepl on a replica will 
correctly handle looking at two masters providing the same changes to it.

--Quanah


--

Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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