i had a problem setting up mod_jk to load-balance my local_workers properly. Here is my environment:
2 Apaches 2.0.48 + mod_jk 1.2.5 4 Workers behind them. all on linux rh8
the workers.properties for apache-A look like this:
worker.list=loadbal
worker.devprocA1.type=ajp13 worker.devprocA1.host=w1.my.net worker.devprocA1.port=10011 worker.devprocA1.lbfactor=1 worker.devprocA1.local_worker=1
worker.devprocA2.type=ajp13 worker.devprocA2.host=w2.my.net worker.devprocA2.port=10012 worker.devprocA2.lbfactor=1 worker.devprocA2.local_worker=1
worker.devprocB1.type=ajp13 worker.devprocB1.host=w3.my.net worker.devprocB1.port=10021 worker.devprocB1.lbfactor=1 worker.devprocB1.local_worker=0
worker.devprocB2.type=ajp13 worker.devprocB2.host=w4.my.net worker.devprocB2.port=10022 worker.devprocB2.lbfactor=1 worker.devprocB2.local_worker=0
worker.loadbal.type=lb worker.loadbal.balanced_workers= devprocA1, devprocA2, devprocB1, devprocB2 worker.loadbal.local_worker_only=0 worker.loadbal.sticky_session=1
the workers.properties for apache-B looks the same, except for the worker.devproc*.local_worker setting, which is inverted.
My goal was to balance devprocA1,devprocA2 by Apache-A and devprocB1,devprocB2 by Apache-B + If Apache-A local workers fail it should failover to the B-Workers and vice-versa for Apache-B
Everything worked fine except the balancing of the local_workers.
Apache-A balanced every request to devprocA1 and Apache-B balanced every request to devprocB1. The balancing with a sticky session sill worked fine.
Maybe i misunderstood the meaning of local_worker but in my opinion it should first try to balance the local_workers (equally) and if all local_worker fail it should try to balance the other workers (equally).
I had a look at the mod_jk code and after applying the patch below it worked as expected.
--------- cut here ---------
diff -ruN jakarta-tomcat-connectors-jk-1.2.5-src/jk/native/common/jk_lb_worker.c jakarta-tomcat-connectors-jk-1.2.5-src_patch/jk/native/common/jk_lb_worker.c
--- jakarta-tomcat-connectors-jk-1.2.5-src/jk/native/common/jk_lb_worker.c 2003-07-15 14:15:42.000000000 +0200
+++ jakarta-tomcat-connectors-jk-1.2.5-src_patch/jk/native/common/jk_lb_worker.c 2004-01-23 09:15:55.000000000 +0100
@@ -291,16 +291,17 @@
}
}
} else {
- if(p->lb_workers[i].lb_value < lb_min || !rc) {
+ if(!rc ||
+ (!rc->is_local_worker && p->lb_workers[i].is_local_worker) ||
+ ((rc->is_local_worker == p->lb_workers[i].is_local_worker) && (p->lb_workers[i].lb_value < lb_min))) {
lb_min = p->lb_workers[i].lb_value;
rc = &(p->lb_workers[i]);
- if (rc->is_local_worker) break;
}
}
}
}
- if(rc && !rc->is_local_worker) {
+ if(rc) {
rc->lb_value += rc->lb_factor;
}
--------- cut here ---------any comments?
if the code and lb change is ok, please feel free to commit the patch to the cvs.
thanks Andre
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