Re: pg_upgrade + streaming replication ?

On Mon, 2012-03-19 at 15:30 -0400, Bruce Momjian wrote:
> On Thu, Mar 01, 2012 at 02:01:31PM -0800, Lonni J Friedman wrote:
> > I've got a 3 node cluster (1 master/2 slaves) running 9.0.x with
> > streaming replication.  I'm in the planning stages of upgrading to
> > 9.1.x, and am looking into the most efficient way to do the upgrade
> > with the goal of minimizing downtime & risk.  After googling, the only
> > discussion that I've found of using pg_upgrade with a streaming
> > replication setup seems to be this (nearly) year old thread:
> > http://web.archiveorange.com/archive/v/9FNVlDWGQtpyWVL54jlK
> >
> > In summary, there is no way to use both pg_upgrade and streaming
> > replication simultaneously.  I'd have to either use pg_upgrade and
> > then effectively rebuild/redeploy the slaves, or not use pg_upgrade,
> > and reimport all of the data.  Is that still the latest status, or are
> > there other options?
>
> You can shut down all three servers, run pg_upgrade on all of them, then
> restart them as 9.1 servers.

After running pg_upgrade on each server individually, they will have
different system IDs, and potentially different on-disk representation
of the catalogs, right?

So how can you resume streaming without rebuilding the slaves?

Regards,
    Jeff Davis