On Feb 13, 2008, at 12:41 PM, Plüm, Rüdiger, VF-Group wrote:
Agreed, but I doubt that it is possible with a reasonable amout of
health
check frequency to find out before the first real request falls
through,
provided that your health checks are designed to only fail if the
backend
is down. If your health checks are smarter and notice that the
backend will
fail soon (e.g. because it reached 98% or 99% percent of its
capacity) then
this is a different story and can be very useful.
Regarding the reactivation of a failed backend I fully agree: Active
health
checks would be an asset here instead of just retrying failed
backends periodically
with real requests.
Ideally, it would be nice if we had better insight on the
actual health of the backends than a simple "do they respond
to OPTIONS * and how long does it take", but that's pretty
much all we can do unless go full-on multicasting of info
ala mod_backhand... At least the balancer is setup to allow
for load balancing based on that, if the submodule/provider
actually existed :)
