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c#iislong-pollingapplication-pool

Will IIS recycle application pool if web application has pending long-running request?

Intro

I am developing a web application using ASP.NET MVC 3, C#, targeting IIS 7.0+. We have a number of long-running async requests (utilizing AsyncController/Async action features). I also use HttpRuntime.Cache quite often (and in some non-standard way which doesn't really matter here).

Question

Can IIS application pool be suddenly recycled if there are active long-running requests present? I want to prevent that behavior if possible as I don't want to lose data from cache.

Do I really need to use some persistent storage (i.e. Database) to overcome possible issues?

Solution

  • Normally IIS won't recycle an application which has pending requests for it due to period of inactivity. But IIS could recycle your application if you hit memory or CPU tresholds. But this is something that you could configure in your IIS management console.