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From 张文东 <zwd2...@gmail.com>
Subject [users@httpd] (mod_jk load balancer) could not get free endpoint for worker xxx
Date Tue, 24 Mar 2009 08:37:18 GMT
Hi all.

I'm using httpd 2.2 and websphere application community edition
(wasce) 2.1.1 (you may treat it as tomcat if you are not familiar with
wasce).
My goal is: the httpd server delivers 3000 requests per second to the
wasce servers. I use the mod_jk module, and the workers.properties
conf like this:

...
worker.node5.port=8009
worker.node5.host=9.186.96.71
worker.node5.type=ajp13
worker.node5.connection_pool_size=50
worker.node5.connection_pool_minsize=25
worker.node5.connection_pool_timeout=600
worker.node5.lbfactor=1

worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=node1, node2,node3,node4,node5
worker.loadbalancer.sticky_session=1
worker.loadbalancer.sticky_session_force=0

now the question is, I'm using mod_jk as the load balancer server.
when users' requests increase (more than 1000requests per second),
there are many warnings in the mod_jk.log:
[Tue Mar 24 15:36:37 2009] [14425:735282400] [warn]
ajp_get_endpoint::jk_ajp_common.c (2946): Unable to get the free
endpoint for worker node3 from 50 slots
[Tue Mar 24 15:36:37 2009] [14425:4059268320] [info]
service::jk_lb_worker.c (1161): could not get free endpoint for worker
node3 (0 retries)

and the performance of httpd reduce.

I want to know is there anybody having the SAME SITUATION or someone
knows is there any error in my worker.properties configuation (which
causes the could not get free endpoing error).

Thanks.

-- 
Best Regards!
Wen Dong

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