Madhur K Tanwani wrote:
Thanks Filip.
I understand now that Tomcat performs redirection - which implies that
the
URL must change.
Then, I suppose I must ask
- Is something like mod_proxy available in Tomcat?
- Is it possible to emulate the same behavior in Tomcat?
not really, Tomcat isn't really built for any of that kind of stuff
either, even the "tomcat balancer" is not a real load balancer, its just
an example app, but you would never use it in the real world due to
blocking IO and thread dependencies in Tomcat/Java
After my discussion on the Tomcat 5.5 load balancing thread and this
one, I'm
thinking of a setup like
<request>
|
V
Apache 2.0 httpd Webserver
(LB with sticky sessions, weighted round robin, mod_jk2)
mod_jk2 is obsolete and longer used nor developed. You would need to go
with mod_jk 1.2.15
|
|--------> Tomcat Worker 1 (ajp13)
|--------> Tomcat Worker 2 (ajp13)
|--------> Tomcat Worker 3 (ajp13)
The session management will be done using either JDBCStore or in-memory
replication amongst the Tomcat servers.
Can you suggest something in the design that is wither wrong or can be
improved?
Is there something that the LB gurus find obviously wrong here and
would want to
tell me (or would you want me to encounter it as it comes :) )?
looks good, if you only have one httpd, is that a single point of
failure for you?
Awaiting your valuable comments,
Madhur.
Filip Hanik - Dev Lists wrote:
redirection, as the name tells you, doesn't balance, it redirects,
and there is nothing transparent about a redirection.
what you are looking for is called proxying, and the best example for
that, would be mod_proxy in the Apache httpd web server.
Filip
Madhur K Tanwani wrote:
Hi,
I'm separating this question from my earlier thread on load
balancing rules - it
seems that it was over-looked there since it did not fit in there :(.
My question is that when I use the default balancer webapp from
Tomcat 5.5 the
redirection rules redirect me to either jakarta, cnn or yahoo's
site. However,
the redirection is not transparent to the user.
for example,
Client Types : http://servername:8080/balancer/
Balancer Redirects To: http://jakarta.apache.org
*The browser URL changes to : http://jakarta.apache.org*
I think this change of URL does not make the transition transparent.
Also, the
subsequent requests bypass the load balancer(LB) and are directly
served by the
server (so what happens if the server is down - the LB has support
for fail over
but the request never went via the LB)
Please could someone throw some light on the same?
Awaiting responses,
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