Two items to note here:
1. As I can recall, Dave Watts is somewhat of an expert
on cluster Cats so I would like to see his input on
this.
2. One item to note with session vars in a clustered env
is that if the server goes down that the user was
attached to, then all of their data is lost. This
is a very good argument (IMHO) for using client vars
in clusters. Then the user's "session" will continue
even if the server they came in on crashes.
-----Original Message-----
From: Matthew R. Small [mailto:[EMAIL PROTECTED]]
Sent: Friday, March 15, 2002 2:39 PM
To: CF-Talk
Subject: RE: ClusterCATS and "stickiness
As I understand it, clustercats will loadbalance an initial request to a
server with the best response time. Every request after that from the
same session will then be re-directed to the same server. This is
"sticky sessions" and will(should) enable you to keep using session
variables. If you weren't using sticky sessions, the server that
processes the request from the client would probably change for every
request. In that case, I imagine the best thing to do would be convert
all session vars to client so they be returned to the server for proper
processing.
- Matt Small
-----Original Message-----
From: Matt Kornguth [mailto:[EMAIL PROTECTED]]
Sent: Friday, March 15, 2002 2:20 PM
To: CF-Talk
Subject: ClusterCATS and "stickiness
My company is getting ready to move to a clustered environment. We
currently use session variables for our shopping cart.
I keep seeing posts about needing to convert to client variables for
load balancing, despite the fact that the CF5 Advanced CF
Administration manual (chp 12, Configuring ColdFusion Clusters) states:
"To ensure that users are not redirected from the server on which they
start their session, ClusterCATS provides a built-in feature for
enabling session-aware load balancing."
So ... I'm getting nervous here. Does anyone have experience with
session-aware load balancing in ClusterCATS? Is there some reason that
everyone is recommending client variables?
Thanks in advance,
Matt Kornguth
Web Applications Developer
BLR.com
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