concern about Apache + mod_jk + Tomcat cluster
Hi, I installed the Apache1.3.27, mod_jk1.2.1 and Tomcat4.1.18 recently on our Solaris6 machine. The approach is that let 1 apache as web server dispatches requestes to the 3 tomcat server instances. There is no error in the configuration, and install. But when I was load-testing the application, I noticed that there were lots of error message shown in the mod_jk file, although all the requests were dispatched to the tomcat servers and responded with 200. I then changed the 3 tomcat servers' configure as following: Connector className=org.apache.ajp.tomcat4.Ajp13Connector port=11009 minProcessors=1 maxProcessors=1 acceptCount=10 debug=1/ So now every Tomcat can only accept 1 request at the same time. I then sent 3 concurrent requests to the cluster: tomcat21, tomcat22, tomcat23. From the debug/log file, I think the mod_jk and tomcats are working like : 1, 3 requests reaches mod_jk, mod_jk sends requests to tomcat21 2, tomcat21 accepts the first one and rejects the other 2, 3, mod_jk logs errors in mod_jk.log, reports the tomcat is down or network problem. 4, mod_jk then sends the 2 to tomcat22 5, tomcat22 accepts 1 and rejects the other. 6, mod_jk again logs errors. 7. mod_jk sends the alst one to tomcat23, 8, tomcat 23 accepts it. I think there is nothing wrong with this procedure, but besides the annoying error messages, the whole performance is poor due to the time spent in the probes. I also suspect that the socket connection in Solaris6 is too slow, for some reason. I have questions for those who have the tomcat cluster in there production site: how about the performance in your site? Is there anything wrong with my configuration or should I use JK2 to improve performance? The configuration files and log files are attached with this email. OS: Solaris 6 Apache1.3.27, Tomcat 4.1.18, mod_jk1.2.1( I can not find the binary mod_jk at the apache.org site under solaris6 directory, so, I download the one in Solaris8 dir). Thanks, Jerry You tomcat_23_catalina.log the_change_to_httpd.conf workers.properties change_to_tomcat21_server.xml tomcat_21_catalina.log tomact_22_catalina.log tomcat_23_catalina.log Description: Binary data the_change_to_httpd.conf Description: Binary data workers.properties Description: Binary data change_to_tomcat21_server.xml Description: Binary data tomcat_21_catalina.log Description: Binary data tomact_22_catalina.log Description: Binary data -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: concern about Apache + mod_jk + Tomcat cluster
Hi, Make sure you have set the MaxProcessors property of the AJP13 Connector in server.xml to an equal or higher value as specified in MaxClients of the httpd.conf. llap, julian - Original Message - From: YOU, JERRY (SBCSI) [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Wednesday, January 15, 2003 6:04 PM Subject: concern about Apache + mod_jk + Tomcat cluster Hi, I installed the Apache1.3.27, mod_jk1.2.1 and Tomcat4.1.18 recently on our Solaris6 machine. The approach is that let 1 apache as web server dispatches requestes to the 3 tomcat server instances. There is no error in the configuration, and install. But when I was load-testing the application, I noticed that there were lots of error message shown in the mod_jk file, although all the requests were dispatched to the tomcat servers and responded with 200. I then changed the 3 tomcat servers' configure as following: Connector className=org.apache.ajp.tomcat4.Ajp13Connector port=11009 minProcessors=1 maxProcessors=1 acceptCount=10 debug=1/ So now every Tomcat can only accept 1 request at the same time. I then sent 3 concurrent requests to the cluster: tomcat21, tomcat22, tomcat23. From the debug/log file, I think the mod_jk and tomcats are working like : 1, 3 requests reaches mod_jk, mod_jk sends requests to tomcat21 2, tomcat21 accepts the first one and rejects the other 2, 3, mod_jk logs errors in mod_jk.log, reports the tomcat is down or network problem. 4, mod_jk then sends the 2 to tomcat22 5, tomcat22 accepts 1 and rejects the other. 6, mod_jk again logs errors. 7. mod_jk sends the alst one to tomcat23, 8, tomcat 23 accepts it. I think there is nothing wrong with this procedure, but besides the annoying error messages, the whole performance is poor due to the time spent in the probes. I also suspect that the socket connection in Solaris6 is too slow, for some reason. I have questions for those who have the tomcat cluster in there production site: how about the performance in your site? Is there anything wrong with my configuration or should I use JK2 to improve performance? The configuration files and log files are attached with this email. OS: Solaris 6 Apache1.3.27, Tomcat 4.1.18, mod_jk1.2.1( I can not find the binary mod_jk at the apache.org site under solaris6 directory, so, I download the one in Solaris8 dir). Thanks, Jerry You tomcat_23_catalina.log the_change_to_httpd.conf workers.properties change_to_tomcat21_server.xml tomcat_21_catalina.log tomact_22_catalina.log -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: concern about Apache + mod_jk + Tomcat cluster
Can you post the workers.properties file? I use equal lblweight (I think that is the name of the property) set to 100 for the 4 Tomcat instances. I have a nearly identical setup: twp Apache 1.3.27 server running on Redhat 7.3 load balancing across 4.0.6 Tomcat instances running on two Solaris 8 servers. We have no performance issues and I am using the default Processor settings in server.xml. We go through roughly 1 million hits a month. HTH, Ben Ricker On Wed, 2003-01-15 at 11:04, YOU, JERRY (SBCSI) wrote: Hi, I installed the Apache1.3.27, mod_jk1.2.1 and Tomcat4.1.18 recently on our Solaris6 machine. The approach is that let 1 apache as web server dispatches requestes to the 3 tomcat server instances. There is no error in the configuration, and install. But when I was load-testing the application, I noticed that there were lots of error message shown in the mod_jk file, although all the requests were dispatched to the tomcat servers and responded with 200. I then changed the 3 tomcat servers' configure as following: Connector className=org.apache.ajp.tomcat4.Ajp13Connector port=11009 minProcessors=1 maxProcessors=1 acceptCount=10 debug=1/ So now every Tomcat can only accept 1 request at the same time. I then sent 3 concurrent requests to the cluster: tomcat21, tomcat22, tomcat23. From the debug/log file, I think the mod_jk and tomcats are working like : 1, 3 requests reaches mod_jk, mod_jk sends requests to tomcat21 2, tomcat21 accepts the first one and rejects the other 2, 3, mod_jk logs errors in mod_jk.log, reports the tomcat is down or network problem. 4, mod_jk then sends the 2 to tomcat22 5, tomcat22 accepts 1 and rejects the other. 6, mod_jk again logs errors. 7. mod_jk sends the alst one to tomcat23, 8, tomcat 23 accepts it. I think there is nothing wrong with this procedure, but besides the annoying error messages, the whole performance is poor due to the time spent in the probes. I also suspect that the socket connection in Solaris6 is too slow, for some reason. I have questions for those who have the tomcat cluster in there production site: how about the performance in your site? Is there anything wrong with my configuration or should I use JK2 to improve performance? The configuration files and log files are attached with this email. OS: Solaris 6 Apache1.3.27, Tomcat 4.1.18, mod_jk1.2.1( I can not find the binary mod_jk at the apache.org site under solaris6 directory, so, I download the one in Solaris8 dir). Thanks, Jerry You tomcat_23_catalina.log the_change_to_httpd.conf workers.properties change_to_tomcat21_server.xml tomcat_21_catalina.log tomact_22_catalina.log __ -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- Ben Ricker [EMAIL PROTECTED] Wellinx.com -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: concern about Apache + mod_jk + Tomcat cluster
Here is the workers.properties. One thing to note is that I downloaded the mod_jk from apache.org. I can only find binary mod_jk_1.3_eapi.so (and no_eapi.so) from Solaris8 directory. So, I use it on Solaris6 system. Also, all the servers including apache, tomcats are running on the same machine (5G mem). I use the grinder http://grinder.sourceforge.net/ as load testing tool. Thanks, Jerry You -Original Message- From: Ben Ricker [mailto:[EMAIL PROTECTED]] Sent: Wednesday, January 15, 2003 12:54 PM To: '[EMAIL PROTECTED]' Subject: Re: concern about Apache + mod_jk + Tomcat cluster Can you post the workers.properties file? I use equal lblweight (I think that is the name of the property) set to 100 for the 4 Tomcat instances. I have a nearly identical setup: twp Apache 1.3.27 server running on Redhat 7.3 load balancing across 4.0.6 Tomcat instances running on two Solaris 8 servers. We have no performance issues and I am using the default Processor settings in server.xml. We go through roughly 1 million hits a month. HTH, Ben Ricker On Wed, 2003-01-15 at 11:04, YOU, JERRY (SBCSI) wrote: Hi, I installed the Apache1.3.27, mod_jk1.2.1 and Tomcat4.1.18 recently on our Solaris6 machine. The approach is that let 1 apache as web server dispatches requestes to the 3 tomcat server instances. There is no error in the configuration, and install. But when I was load-testing the application, I noticed that there were lots of error message shown in the mod_jk file, although all the requests were dispatched to the tomcat servers and responded with 200. I then changed the 3 tomcat servers' configure as following: Connector className=org.apache.ajp.tomcat4.Ajp13Connector port=11009 minProcessors=1 maxProcessors=1 acceptCount=10 debug=1/ So now every Tomcat can only accept 1 request at the same time. I then sent 3 concurrent requests to the cluster: tomcat21, tomcat22, tomcat23. From the debug/log file, I think the mod_jk and tomcats are working like : 1, 3 requests reaches mod_jk, mod_jk sends requests to tomcat21 2, tomcat21 accepts the first one and rejects the other 2, 3, mod_jk logs errors in mod_jk.log, reports the tomcat is down or network problem. 4, mod_jk then sends the 2 to tomcat22 5, tomcat22 accepts 1 and rejects the other. 6, mod_jk again logs errors. 7. mod_jk sends the alst one to tomcat23, 8, tomcat 23 accepts it. I think there is nothing wrong with this procedure, but besides the annoying error messages, the whole performance is poor due to the time spent in the probes. I also suspect that the socket connection in Solaris6 is too slow, for some reason. I have questions for those who have the tomcat cluster in there production site: how about the performance in your site? Is there anything wrong with my configuration or should I use JK2 to improve performance? The configuration files and log files are attached with this email. OS: Solaris 6 Apache1.3.27, Tomcat 4.1.18, mod_jk1.2.1( I can not find the binary mod_jk at the apache.org site under solaris6 directory, so, I download the one in Solaris8 dir). Thanks, Jerry You tomcat_23_catalina.log the_change_to_httpd.conf workers.properties change_to_tomcat21_server.xml tomcat_21_catalina.log tomact_22_catalina.log __ -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- Ben Ricker [EMAIL PROTECTED] Wellinx.com -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] workers.properties Description: Binary data -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
