We have a 12 (tomcat 5.5.16) instance cluster on 4 physical machines running redhat linux. There is an Apache installed on each machine (4 mod_jks). Each mod_jk's worker.properties is configured exactly the same way i.e. each mod-jk load-balances across all 12 tomcat instances. All instances have the same weights in each mod_jk and sticky sessions are enabled. >From Rainer Jung's email, I understand now that there are three load-balancing algorithms and 'busyness' seems to be the default. But with this algorithm, the workload distribution is uneven during a load test. The reason I can think of is that since there are 4 mod_jk load balancers with no knowledge of each other's counts, the distribution is getting screwed up. Is this a fair assessment? Is there a way to solve it? We do need this redundancy in load balancers, so cannot get rid of any.
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