not getting "load-balancing" behavior

[John Klassa <kl...@cisco.com>]

We're using apache 1.3.33 with tomcat 5.0.16, connected via mod_jk, on 
Solaris.

What I'm observing is that "load-balancing" isn't working.  We have a 
couple of machines dedicated to our XML interface, and have apache 
configured to hand all such requests to "loadbalancer3".  In our mod_jk 
configuration file, we've got:

> JkMount /xml/* loadbalancer3

Loadbalancer3 is configured as follows, in the workers.properties file:

> worker.loadbalancer3.type=lb
> worker.loadbalancer3.balanced_workers=machine-a,machine-b
> worker.loadbalancer3.sticky_session=0
> worker.loadbalancer3.sticky_sessions=0

I used both "sticky_session" and "sticky_sessions" because I've seen it 
both ways, in documentation.  (Which is it really?)

Anyway, I've got "lbfactor" set to 1 for both machine-a and machine-b.

Now, in operation, machine-a is getting hammered, while machine-b gets 
almost no traffic at all.  Machine-a typically has CPU loads in the 4.0 
range, while machine-b sits idle at 0.04.

My hunch is that the bulk of the traffic is coming from a single 
source, and so apache/mod_jk/something is deciding to give it over to 
the same tomcat instance each time, even though it shouldn't be.  
Ideally, work would be handed to machine-a and machine-b in round-robin 
fashion, regardless of past history.

Any clues as to what I'm doing wrong?  This is causing no shortage of 
consternation in our production environment.

Thanks,
John

--
John Klassa / klassa@cisco.com
Test Information Systems / Central Engineering Services
Cisco Systems / RTP / NC/ USA

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