Servlets are not the limiting factor to scalability. Architecture and the way
servlets are integrated into that architecture is. There is no reason why, if
the hardware is big enough and the load distribution schema is robust enough,
that you couldn't have infinite scalability using servlets.
When you consider 300 concurrent users, are you referring to stateless
sessions? Because I know of very few sites that receive 300 simultaneous
stateless connections. If this were peak usage, this would translate to
somewhere between 6-8 million hits per day. With volume like that it would be
necessary to employ multiple load balanced servers, most likely with geographic
dispersion with connections to multiple NAPs.
Servlets are only part of the equation when it comes to constructing and
deploying a high volume site. In large sites based on java technologies,
servlets are used in conjunction with JSPs, they employ architectural patterns
such as MVC or the command pattern, where the servlet provides no business
logic, but rather acts as the controller to the presentation --JSPs provide the
presentation. Back end services are typically provided by some app server,
services are accessed using perhaps any number of technologies, including;
JavaBeans, EJBs, CORBA, DCE, mainframe, etc.
The app server is where the real heavy duty work is done. This is where you
need facilities that can load balance, provide transaction monitoring, and
connectivity to other high availability services.
-ernie
Rizwan Quadri wrote:
> Hi All,
>
> I have read that servlets are used for small and medium size solutions,
> and also that they cannot handle more than 300 concurrent users, though
> i havenot used it in such large application.
>
> What do you think about using servlets at this level?
> Which technology would you suggest ? why ?
>
> Thankyou,
> Rizwan Quadri
> Web Developer
> PieNet Global
>
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