On Sun, Oct 3, 2010 at 07:07, Karl Denninger <karl@denninger.net> wrote:
> Now how do I get an arithmetic difference between the two? There will
> (usually) be a small difference between the master and slave on a busy
> system - what I want to do is query both and if the difference in their
> locations is greater than some defined size, start raising hell (e.g.
> sending SMS to people, etc)
Take a look at this code for an example:
http://munin-monitoring.org/browser/trunk/plugins/node.d/postgres_streaming_.in?rev=3905
I *think* it's complete :-)
> With Slony there was a set of system tables that would tell me how many
> unapplied changes were in the queue. From this I could determine health -
> if the number was more than some reasonably-small amount, something was
> broken and alarms were to be raised.
Yeah, streaming can't do it quite so conveniently for you, since the
view can only talk to one database at a time.
--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/
