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say_hi_ravi 07-19-2010 05:26 AM

Apache Jboss load balancer issue
 
We are facing an issue with Apache not being able to serve all the requests efficiently. In server satus page I can see there are many requests currently waiting for JBoss instances to respond. We are using mod_jk connector to load balance JBoss instances across two datacenters. Due to this issue we are facing some URLs being inaccessible.

240 requests currently being processed, 34 idle workers
WWWWWWW_WWW_WWWWWW_WKWWW_WWWW__W_W_WWWWWWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWWWWWWWWW_WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW_WWW
WWWK_WWW_WWWWWWWWWWWWWWWW_WWWWWWWWWWWW_WWWWWWWWWWWWWWWWWWWWWWWWW
WWWWWWWWWWWWWW_WWWWWKWWWWWWW_W__WWWWWWWWWWKWWWWWWWWKW_W_WWW_W_KW
_W_WKW__WK________..............................................
................................................................
................................................................
................................................................
................................................................


I am not sure if we are missing on something or some performance tuning parameters. Below are few params in configuratin file of Apache https.conf

Quote:

Timeout 120
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 15


<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 1024
MaxClients 1024
MaxRequestsPerChild 4000
</IfModule>

<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>


LoadModule jk_module /opt/jfarm/apache-modules/mod_jk-linux-x64/mod_jk-1.2.28-httpd-2.2.X.so

<VirtualHost *:80>
DocumentRoot /etc/httpd/htdocs
CustomLog "|/usr/sbin/rotatelogs /var/log/httpd/access_log 10M" common
ErrorLog /var/log/httpd/error_log
JkMount /jkstatus jkstatus
</VirtualHost>

<VirtualHost *:80>
ServerName jfarm-apex-int-jb.nomura.com
ServerAlias jfarm-apex-int-jb
JkMount /* lb-apex-integration
CustomLog "|/usr/sbin/rotatelogs /opt/jfarm/apache/logs/apex-integration.access.log 10M" common
ErrorLog /opt/jfarm/apache/logs/apex-integration.error.log
</VirtualHost>

Our workers.properties file looks like this (apex is an example of one worker for jboss insatnce. Like this tehre are many workers)

Quote:

worker.list=jkstatus
worker.jkstatus.type=status
worker.basic.connection_pool_timeout=600
worker.basic.socket_keepalive=1

worker.apex-integration1.host=server1
worker.apex-integration1.port=12252
worker.apex-integration1.type=ajp13
worker.apex-integration1.lbfactor=1
worker.apex-integration2.host=server2
worker.apex-integration2.port=12252
worker.apex-integration2.type=ajp13
worker.apex-integration2.lbfactor=1
worker.lb-apex-integration.type=lb
worker.lb-apex-integration.balance_workers=apex-integration1,apex-integration2
worker.lb-apex-integration.sticky_session=1
worker.list=lb-apex-integration
worker.lb-apex-integration.reference=worker.basic
Any help much appreciated!

Thanks,
Ravi


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