On 5/16/16 2:36 AM, Bruce Momjian wrote:
> Right. I am thinking of writing some docs about how to avoid downtime
> for upgrades of various types.
If there's some magic sauce to shrink pg_upgrade downtime to near 0 I
think folks would be very interested in that.
Outside of that scenario, I think what would be far more useful is
information on how to do seamless master/replica switchovers using tools
like pgBouncer or pgPool. That ability is useful *all* the time, not
just when upgrading. It makes it trivial to do OS-level maintenance, and
if you're using a form of logical replication it also makes it trivial
to do expensive database maintenance, such as cluster/vacuum
full/reindex. I've worked with a few clients that had that ability and
it was a huge stress reducer. As a bonus, an unplanned outage of the
master becomes far less stressful, because you already know exactly how
to fail over.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
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