Solved

Apache HTTP Server/Tomcat Load Balancing Problem

Posted on 2007-03-30
5
784 Views
Last Modified: 2012-08-13
I am trying to load balance our web based application using Apache HTTP Server and Tomcat on Linux.

I think I have setup the environments correctly, although I am not sure of the configuration parameters for either apache or tomcat. We have apache running on one linux server and 2 instances of tomcat running on two nodes with linux installed.

I am using JMeter to test the load on our app. I can get JMeter to send 30 simultanous requests (num of users)  for 4 consecutive intervals in each thread group, however as I change the number of users to 35, I start getting
"HTTP response code: 500
HTTP response message: Internal Server Error" errors.

As I monitor apache's log file, I can see it is receiving all the POST requests, however it seems to me like it is not able to send them all to its workers, tomcat1 and tomcat2, or workers are not capable of accepting and serving these requests.

If you have any suggestions/recommendations on how to configure apache or tomcat to handle more simultanous users, please advise.

I am using:
apache 2.2
mod_jk: download   mod_jk-1.2.21-apache-2.2.x-linux-i686.so
tomcat 5.5.12
jrockit r27

Thank you,
Noushin
0
Comment
Question by:NoushinB
  • 2
5 Comments
 
LVL 30

Expert Comment

by:mayankeagle
ID: 18827812
Are there any error logs in Tomcat's logs? 500 internal error would mean some exception was thrown on the server side. Are you closing your connections, etc properly in finally blocks? Also ensure you don't store any state in the servlets and if you do then they should be thread safe. Difficult to say what it is without knowing what your application does.
0
 

Author Comment

by:NoushinB
ID: 18838046
After turning on exception handling, we noticed our calls to web services were timing out. We increased our WS timeout setting and the application proceeded successfully. Thanx.
0
 
LVL 30

Accepted Solution

by:
mayankeagle earned 500 total points
ID: 19046537
Yes that is why Tomcat was getting those time out exceptions and showing you a 500 ;)
0
 
LVL 1

Expert Comment

by:Computer101
ID: 20634039
Forced accept.

Computer101
EE Admin
0

Featured Post

Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

Join & Write a Comment

Meet the world's only “Transparent Cloud™” from Superb Internet Corporation. Now, you can experience firsthand a cloud platform that consistently outperforms Amazon Web Services (AWS), IBM’s Softlayer, and Microsoft’s Azure when it comes to CPU and …
ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
This video discusses moving either the default database or any database to a new volume.
This video demonstrates how to create an example email signature rule for a department in a company using CodeTwo Exchange Rules. The signature will be inserted beneath users' latest emails in conversations and will be displayed in users' Sent Items…

708 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now