Strategies for managing a large volume of pending requests

I am looking to create a website that can notify users about events happening on the server. Here is my proposed plan:

  1. Send an asynchronous request to the server (ASP.NET) with a 600-second time-out
  2. If an event occurs on the server within those 600 seconds, the server will respond with event details
  3. If no event occurs within the time frame, the server will send a 'no event' response after 600 seconds
  4. JavaScript will process the server's feedback and send the next request accordingly

However, a potential issue with this approach is that a large number of visitors may lead to a high volume of 'pending' requests on the website.

Questions:

Is this pending request issue a problem? What solutions could address this challenge? Should I consider implementing a different approach?

Your advice and feedback are greatly appreciated.

javascriptasp.netperformanceoptimization

Answer №1

My knowledge about how asp.net handles pending requests is limited, but it seems like what you're explaining is similar to long-polling. There are several challenges associated with this approach, including:

  • Each pending request uses a thread, requiring state to be stored on each thread.
  • If there are a significant number of connections, they may need to span multiple machines, necessitating an architecture to distribute endpoints and ensure incoming requests are directed to the correct machine. However, if you're broadcasting the same data to all users, this is simpler.
  • Proxies, ISPs, or other factors could potentially terminate your long-poll request, so you need a resilient architecture.

If you're interested in learning more about long-polling in asp.net, you can check out this question on Stack Overflow: How to do long-polling AJAX requests in ASP.NET MVC? This could be a good starting point.

Alternatively, you might want to consider using a third-party service like pusher to manage these connections for you, or explore options like App Engine's Channel API (disclaimer: I work on App Engine).

Answer №2

Perhaps consider sending more frequent requests to the server without using up too many server resources over a period of 10 minutes?

For example, you could send an AJAX request every 60 seconds to check for any events and notify the user if something has occurred. The downside is that there may be a delay of up to a minute before the user is notified of an event, so immediate notifications may be a challenge.

If immediate notifications are necessary, exploring the option of "long polling" with technologies like node.js could be a viable solution, although it may require some effort to implement.

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