Re: standby registration (was: is sync rep stalled?)

On Tue, 2010-10-05 at 08:57 -0400, Robert Haas wrote:
> On Tue, Oct 5, 2010 at 8:34 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
> > On Mon, 2010-10-04 at 12:45 -0700, Josh Berkus wrote:
> >> >>> Quorum commit, even with configurable vote weights, can't handle a
> >> >>> requirement that a particular commit be replicated to (A || B) && (C
> >> >>> || D).
> >> >> Good point.
> >
> > Asking for quorum_commit = 3 would cover that requirement.
> >
> > Not exactly as requested, but in a way that is both simpler to express
> > and requires no changes to configuration after failover. ISTM better to
> > have a single parameter than 5 separate configuration files, with
> > behaviour that the community would not easily be able to validate.
> 
> That's just not the same thing.

In what important ways does it differ? In both cases, no reply will be
received until both sites have confirmed receipt.

-- Simon Riggs           www.2ndQuadrant.comPostgreSQL Development, 24x7 Support, Training and Services