Re: Sync Rep Design

On Thu, 2010-12-30 at 22:08 +0100, Stefan Kaltenbrunner wrote:
> On 12/30/2010 10:01 PM, Simon Riggs wrote:
> > On Thu, 2010-12-30 at 15:51 -0500, Robert Treat wrote:
> >
> >> Still, one thing that has me concerned is that in the case of two
> >> slaves, you don't know which one is the more up-to-date one if you
> >> need to failover. It'd be nice if you could just guarantee they both
> >> are...
> >
> > Regrettably, nobody can know that, without checking.
> 
> how exactly would you check? - this seems like something that needs to 
> be done from the SQL and the CLI level and also very well documented 
> (which I cannot see in your proposal).

This is a proposal for sync rep, not multi-node failover. I'm definitely
not going to widen the scope of this project.

Functions already exist to check the thing you're asking.

-- Simon Riggs           http://www.2ndQuadrant.com/books/PostgreSQL Development, 24x7 Support, Training and Services