<cfif StructKeyExists( URL, "reset" )>
<cfset StructClear( APPLICATION ) />
</cfif>
No downed cluster, app scope reset, and really handy.
/kam
-----Original Message-----
From: Douglas Knudsen [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 09, 2005 1:56 PM
To: CF-Talk
Subject: Re: CFC's and limiting DB queries
How do you get zero down time doing this? We have sticky sessions on, so
if
we take a member of the cluster down, we loose like 50% of my users
forcing
them to relogin to the other member, in this case we have two memebers
in
the cluster.
DK
On 6/9/05, Barney Boisvert <[EMAIL PROTECTED]> wrote:
>
> Application-scoped instances are a wonderful thing. And having a
> clustered environment makes them easier to deal with, not harder,
> because you can take a server out of the cluster, let it rebuild it's
> in-memory instances without load, and then reinject it. Repeat for
> the rest of the cluster, and you've got a zero-downtime upgrade. If
> you've got a large cluster, best to take half the servers down,
> upgrade them, then switch halves. As long as you don't need more than
> half your servers to deal with the load (which you shouldn't, because
> you should do upgrade under non-peak load, and most load cycles are
> more than 50% deltas), you can do it all in two steps.
>
> Particularly with larger applications, instantiating a large number of
> CFC instances on every request (rather than leaving them in the
> application scope across requests) can be a real bottleneck. Hundreds
> or thousands of milliseconds per request, if the instances need to do
> complex initialization. Almost always better to cache the instances.
> Just watch out for potential race conditions as multiple requests can
> be accessing the shared instances at any given time.
>
> cheers,
> barneyb
>
> On 6/9/05, Douglas Knudsen <[EMAIL PROTECTED]> wrote:
> > I'd suggest keeping gateways with objects or purposes, having a
> site-wide
> > one will certainly tend to grow to immense porpotions. This from a
bad
> > experience following me around where I work. Also, IMHO, stay away
from
> > application scoped cfc instances unless you really really need them.
> They
> > are a PITA when you need to update the code, most notably when you
are
> in a
> > clustered environment.
> >
> > DK
>
> --
> Barney Boisvert
> [EMAIL PROTECTED]
> 360.319.6145
> http://www.barneyb.com/
>
> Got Gmail? I have 50 invites.
>
>
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