Re: Overwhelming a Web Application Server

[Thorbjoern Ravn Andersen <ravn@xxxxxxxxxx>]

Pete Helgren skrev:
> My experience, so far, is that all of the session handling/management of 
> the servlet container is adequate for what I need.  But in my case, I 
> don't have thousands, or even hundreds of concurrent hits so perhaps my 
> lack of attention to this particular area will come back to haunt me if 
> I get hundreds or thousands of users (a problem I look forward to).
>
>   
For a servlet container a newcomer is Ajax as these usually work by 
having a connection continously open from the browser to the web 
container.   This may cause your web server to run out of resources.

Apparently this will be a part of the 3.0 servlet specification.  Until 
then, Jetty have an unspellable facility for this

http://docs.codehaus.org/display/JETTY/Continuations


> I keep the session timeout value relatively low so that sessions expire 
> and are GC'ed on a regular basis and, although I think that I don't 
> carry too much information around in the session itself, this thread has 
> reminded me that I need to profile my servlet on Tomcat and see how it 
> performs, especially when it comes to memory utilization.
>   
Have a look at jvisualvm in the Sun JDK.  It works well when testing 
locally on your pc.


> It has been a good discussion, and timely.
>
> Pete
>   
I'd again advocate the "Release It!" book by Michael Nygard.  Lots of 
tips from the front line.