On Fri, 2007-10-12 at 10:19 -0400, Tom Lane wrote:
> Simon Riggs <simon@2ndquadrant.com> writes:
> > I think the best way to handle this is to have two limits.
> > First limit attempts to autovacuum, but can be cancelled.
> > When we hit second limit, sometime later, then autovacuum cannot be
> > cancelled.
>
> This seems like uselessly complex overdesign.
OK
> In short: put in the automatic lock cancel for regular vacuums, disable
> it for antiwraparound vacuums, but don't disable manual cancels; and
> definitely don't invent a complicated new set of behaviors around that.
That seemed more complex when I thought about that, but if we just use
SIGUSR2 for automatic cancels then this would be very simple.
Or did you have another design?
-- Simon Riggs 2ndQuadrant http://www.2ndQuadrant.com
