Re: Tomcat Load Balancing / Session Clustering - Tests
Hey everyone, I've set up a few Tomcat instances in a cluster and would like to test the scalability of the cluster as well as make sure the session clustering is working. Testing scalability is easy and I have load balncing software, but whats the best way to make sure that sessions are clustering as expected? humm I guess taht the simplest solution is to check your log files with material added by the javagroups (layer used for clustering feature). My 2 cents Jerome - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat Load Balancing / Session Clustering - Tests
Well, load testing on the Apache end would be the way to go for scalability testing. You can monitor the network connections to the Tomcat instances (use of netstat does well here; grep for the number of connections to each port every N seconds or minutes, etc.). To test the session stuff, try shutting down instances as you are running through the app. Can you access each Tomcat instance individually? The best way is to use each Tomcat's web server and to access it on the port. Then, shut down that Tomcat and access another Tomcat by its port. If your session continues unaffected, you are good to go. If you have a REALLY good load tester that can capture page data (i.e., return codes and pages from the web server), you could randomly shutdown Tomcat instances while load testing to see how that affects the ouput. HTH, Ben Ricker Wellinx.com On Thu, 2003-07-10 at 09:52, Weissman, Alan wrote: Hey everyone, I've set up a few Tomcat instances in a cluster and would like to test the scalability of the cluster as well as make sure the session clustering is working. Testing scalability is easy and I have load balncing software, but whats the best way to make sure that sessions are clustering as expected? Thanks, Alan Weissman Systems Engineer Concord Financial Technologies [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat Load Balancing / Session Clustering - Tests
thanks Ben! -Original Message- From: Ben Ricker [mailto:[EMAIL PROTECTED] Sent: Thursday, July 10, 2003 11:35 AM To: Tomcat Users List Subject: Re: Tomcat Load Balancing / Session Clustering - Tests Well, load testing on the Apache end would be the way to go for scalability testing. You can monitor the network connections to the Tomcat instances (use of netstat does well here; grep for the number of connections to each port every N seconds or minutes, etc.). To test the session stuff, try shutting down instances as you are running through the app. Can you access each Tomcat instance individually? The best way is to use each Tomcat's web server and to access it on the port. Then, shut down that Tomcat and access another Tomcat by its port. If your session continues unaffected, you are good to go. If you have a REALLY good load tester that can capture page data (i.e., return codes and pages from the web server), you could randomly shutdown Tomcat instances while load testing to see how that affects the ouput. HTH, Ben Ricker Wellinx.com On Thu, 2003-07-10 at 09:52, Weissman, Alan wrote: Hey everyone, I've set up a few Tomcat instances in a cluster and would like to test the scalability of the cluster as well as make sure the session clustering is working. Testing scalability is easy and I have load balncing software, but whats the best way to make sure that sessions are clustering as expected? Thanks, Alan Weissman Systems Engineer Concord Financial Technologies [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat Load Balancing / Session Clustering - Tests
If you are using a webserver stresstest tool like siege (http://www.joedog.org/siege) be sure to have a delay (5secs or more) between the requests. Because otherwise if the requests come too fast, the load balancing round robin will get screwed up (i think mod_jk(2)'s worker stats aren't updated quick enough), like this: Siege in benchmark mode (--benchmark on cmdline): 20 or more requests go to first tomcat 20 or more to second 20 or more to third and so on... Siege with delay of 5 secs (--delay=5): 1-2 requests to first tomcat 1-2 to second ... And use something without a session for testing, like an image (or use worker.lb_xx.sticky_session=0) At 12:15 10.07.2003 -0400, you wrote: thanks Ben! -Original Message- From: Ben Ricker [mailto:[EMAIL PROTECTED] Sent: Thursday, July 10, 2003 11:35 AM To: Tomcat Users List Subject: Re: Tomcat Load Balancing / Session Clustering - Tests Well, load testing on the Apache end would be the way to go for scalability testing. You can monitor the network connections to the Tomcat instances (use of netstat does well here; grep for the number of connections to each port every N seconds or minutes, etc.). To test the session stuff, try shutting down instances as you are running through the app. Can you access each Tomcat instance individually? The best way is to use each Tomcat's web server and to access it on the port. Then, shut down that Tomcat and access another Tomcat by its port. If your session continues unaffected, you are good to go. If you have a REALLY good load tester that can capture page data (i.e., return codes and pages from the web server), you could randomly shutdown Tomcat instances while load testing to see how that affects the ouput. HTH, Ben Ricker Wellinx.com On Thu, 2003-07-10 at 09:52, Weissman, Alan wrote: Hey everyone, I've set up a few Tomcat instances in a cluster and would like to test the scalability of the cluster as well as make sure the session clustering is working. Testing scalability is easy and I have load balncing software, but whats the best way to make sure that sessions are clustering as expected? Thanks, Alan Weissman Systems Engineer Concord Financial Technologies [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
