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From <Juergen.L...@it.nrw.de>
Subject AW: AW: [users@httpd] mod_proxy_balance: route redirect not working
Date Fri, 10 Jul 2009 12:30:23 GMT

I checked mod_jk today, but unfortunately it doesn't contain any management 
interface (like e.g. balancer-manager), so I decided to patch the 
mod_proxy_balancer module to add a starvation feature. 
I mainly added a new status (PROXY_WORKER_STARVATION) which can be chosen 
from balancer-manager (as a third option beside Enabled/Disabled).
The routing logic is completely unchanged, but when chosing a worker for a 
stateless request (w/o routing information) only  workers without 
PROXY_WORKER_STARVATION bit set are considered. 
This is done by simple comparison in the find_best_byxxx methods.

Effectively, workers can be put in starvation mode, i.e. :
  - they will not recevice any requests lacking of routing information
  - requests with explicit routing towards them still get delivered
In our scenario, this is quite useful for a planned shutdown of single instances. 
Most of our sessions are idling out after some time, so you minimize the number of frustrated
customers.

This seems to work fine for us and I wonder if this might be interesting for the community.
If yes, how to submit a patch?

Cheers
Jürgen

> -----Ursprüngliche Nachricht-----
> Von: André Warnier [mailto:aw@ice-sa.com] 
> Gesendet: Dienstag, 7. Juli 2009 17:02
> An: users@httpd.apache.org
> Betreff: Re: AW: [users@httpd] mod_proxy_balance: route 
> redirect not working
> 
> Juergen.Link@it.nrw.de wrote:
> > André,
> > thanks for your suggestion. I was using mod_jk a while ago, 
> but was persuaded to switch to mod_proxy.
> > I'm going to build a test env with mod_jk by the end of 
> this week and keep you informed.
> > 
> For additional info, I strongly recommend having a look at 
> the Tomcat users list.  There have been a number of recent 
> posts relative to various mod_jk/load-balancing issues, which 
> resulted in some good explanations.
> For example, this thread :
> http://tomcat.markmail.org/search/?q=Sticky%20session%20and%20
> ModJK%20Load%20Balancer
> 
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