how does IIS detect new code?

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how does IIS detect new code?

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Jason

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Since: Aug 17, 2006
Posts: 12

(Msg. 1) Posted: Mon Jul 23, 2007 6:52 am
Post subject: how does IIS detect new code?
Archived from groups: microsoft>public>inetserver>iis (more info?)

In the scenario where an application is running and in memory, serving users,
then new code is deployed to the server (e.g. using ms application center),
how does IIS know to pick up and start using the new code?

>> Stay informed about: how does IIS detect new code?

kenremove

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Since: Aug 23, 2003
Posts: 2901

(Msg. 2) Posted: Mon Jul 23, 2007 12:02 pm Post subject: Re: how does IIS detect new code? [Login to view extended thread Info.] Archived from groups: per prev. post (more info?)

IIS subscribes to Windows file change notifications, which notifies subscribers that the file(s) have changed. Cheers Ken -- My IIS Blog: www.adOpenStatic.com/cs/blogs/ken "Jason" <Jason.DeleteThis@discussions.microsoft.com> wrote in message news:6AD64CC3-BBEF-493A-8826-B2A1CA13B3EF@microsoft.com... > In the scenario where an application is running and in memory, serving > users, > then new code is deployed to the server (e.g. using ms application > center), > how does IIS know to pick up and start using the new code? >> Stay informed about: how does IIS detect new code?

Jason

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Since: Aug 17, 2006
Posts: 12

(Msg. 3) Posted: Mon Jul 23, 2007 12:02 pm Post subject: Re: how does IIS detect new code? [Login to view extended thread Info.] Archived from groups: per prev. post (more info?)

so the app pool does not need to recycle to start using the new code then? is it a best practice to recycle following a code change? or is IIS supposed to be robust enought to handle that? "Ken Schaefer" wrote: > IIS subscribes to Windows file change notifications, which notifies > subscribers that the file(s) have changed. > > Cheers > Ken > > -- > My IIS Blog: www.adOpenStatic.com/cs/blogs/ken > > "Jason" <Jason RemoveThis @discussions.microsoft.com> wrote in message > news:6AD64CC3-BBEF-493A-8826-B2A1CA13B3EF@microsoft.com... > > In the scenario where an application is running and in memory, serving > > users, > > then new code is deployed to the server (e.g. using ms application > > center), > > how does IIS know to pick up and start using the new code? > > >> Stay informed about: how does IIS detect new code?

kenremove

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Since: Aug 23, 2003
Posts: 2901

(Msg. 4) Posted: Mon Jul 23, 2007 8:57 pm Post subject: Re: how does IIS detect new code? [Login to view extended thread Info.] Archived from groups: per prev. post (more info?)

I don't think it's a matter of "IIS being robust enough" - IIS does not scan the disk continuously looking for file changes. That would be a huge performance issue. IIS instead is notified by Windows when files change, and when it has been notified, it reads in the new file and should invalidate any cached copies. Assuming your browser is not caching anything, you should be able to hit "refresh" in your browser and you'll see the new content. Recycling your app pool shouldn't be necessary - that breaks all existing connections, you lose any in-memory session data etc. Unless you have a reason to do this, I don't think you should be doing so. Cheers Ken "Jason" <Jason DeleteThis @discussions.microsoft.com> wrote in message news:22070F06-6188-4E33-81EC-166B93FC4FE7@microsoft.com... > so the app pool does not need to recycle to start using the new code then? > > is it a best practice to recycle following a code change? or is IIS > supposed to be robust enought to handle that? > > "Ken Schaefer" wrote: > >> IIS subscribes to Windows file change notifications, which notifies >> subscribers that the file(s) have changed. >> >> Cheers >> Ken >> >> -- >> My IIS Blog: www.adOpenStatic.com/cs/blogs/ken >> >> "Jason" <Jason DeleteThis @discussions.microsoft.com> wrote in message >> news:6AD64CC3-BBEF-493A-8826-B2A1CA13B3EF@microsoft.com... >> > In the scenario where an application is running and in memory, serving >> > users, >> > then new code is deployed to the server (e.g. using ms application >> > center), >> > how does IIS know to pick up and start using the new code? >> >> >> Stay informed about: how does IIS detect new code?

David Wang

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Since: Nov 01, 2007
Posts: 309

(Msg. 5) Posted: Tue Jul 24, 2007 3:25 am Post subject: Re: how does IIS detect new code? [Login to view extended thread Info.] Archived from groups: per prev. post (more info?)

Your question is actually about web application deployment, and the specifics depend on the web application itself. This means that IIS has no web application deployment features. For example, if it is an ASP.Net application, changes to /bin DLLs and .aspx pages are dynamically detected and handled. This is a nice feature of the ASP.Net platform -- detecting changes in binaries and dynamically reloading the changes -- but it is also a problem because it keeps the older version loaded as well for garbage collection. If it is an ISAPI application, then you must unload the ISAPI DLL from memory before you can replace it with the new binary. This can be done by recycling the application pool(s) that load the ISAPI DLL. So, I would not say it is a best practice to recycle following a code change, nor is the question about IIS robustness. It is about the developer knowing the deployment needs of his application and how to fulfill them. Stopping the Application Pool, making changes, and Restarting the Application Pool is a consistent way to ensure application changes propagate, but it may not be the best nor only choice for you situation. //David http://w3-4u.blogspot.com http://blogs.msdn.com/David.Wang // On Jul 23, 7:14 am, Jason <Ja... DeleteThis @discussions.microsoft.com> wrote: > so the app pool does not need to recycle to start using the new code then? > > is it a best practice to recycle following a code change? or is IIS > supposed to be robust enought to handle that? > > > > "Ken Schaefer" wrote: > > IIS subscribes to Windows file change notifications, which notifies > > subscribers that the file(s) have changed. > > > Cheers > > Ken > > > -- > > My IIS Blog:www.adOpenStatic.com/cs/blogs/ken > > > "Jason" <Ja... DeleteThis @discussions.microsoft.com> wrote in message > >news:6AD64CC3-BBEF-493A-8826-B2A1CA13B3EF@microsoft.com... > > > In the scenario where an application is running and in memory, serving > > > users, > > > then new code is deployed to the server (e.g. using ms application > > > center), > > > how does IIS know to pick up and start using the new code?- Hide quoted text - > > - Show quoted text - >> Stay informed about: how does IIS detect new code?

Jason

External

Since: Aug 17, 2006
Posts: 12

(Msg. 6) Posted: Tue Jul 24, 2007 6:02 am Post subject: Re: how does IIS detect new code? [Login to view extended thread Info.] Archived from groups: per prev. post (more info?)

so short of ISAPI code, it shouldn't be needed. what about if the deployment changes the framework from 1.1 to 2.0 does that cause IIS to recycle automatically? or does it do it all on the fly as well? "David Wang" wrote: > Your question is actually about web application deployment, and the > specifics depend on the web application itself. This means that IIS > has no web application deployment features. > > For example, if it is an ASP.Net application, changes to /bin DLLs > and .aspx pages are dynamically detected and handled. This is a nice > feature of the ASP.Net platform -- detecting changes in binaries and > dynamically reloading the changes -- but it is also a problem because > it keeps the older version loaded as well for garbage collection. > > If it is an ISAPI application, then you must unload the ISAPI DLL > from memory before you can replace it with the new binary. This can be > done by recycling the application pool(s) that load the ISAPI DLL. > > So, I would not say it is a best practice to recycle following a code > change, nor is the question about IIS robustness. It is about the > developer knowing the deployment needs of his application and how to > fulfill them. Stopping the Application Pool, making changes, and > Restarting the Application Pool is a consistent way to ensure > application changes propagate, but it may not be the best nor only > choice for you situation. > > > //David > http://w3-4u.blogspot.com > http://blogs.msdn.com/David.Wang > // > > > > > > > On Jul 23, 7:14 am, Jason <Ja....TakeThisOut@discussions.microsoft.com> wrote: > > so the app pool does not need to recycle to start using the new code then? > > > > is it a best practice to recycle following a code change? or is IIS > > supposed to be robust enought to handle that? > > > > > > > > "Ken Schaefer" wrote: > > > IIS subscribes to Windows file change notifications, which notifies > > > subscribers that the file(s) have changed. > > > > > Cheers > > > Ken > > > > > -- > > > My IIS Blog:www.adOpenStatic.com/cs/blogs/ken > > > > > "Jason" <Ja....TakeThisOut@discussions.microsoft.com> wrote in message > > >news:6AD64CC3-BBEF-493A-8826-B2A1CA13B3EF@microsoft.com... > > > > In the scenario where an application is running and in memory, serving > > > > users, > > > > then new code is deployed to the server (e.g. using ms application > > > > center), > > > > how does IIS know to pick up and start using the new code?- Hide quoted text - > > > > - Show quoted text - > > > >> Stay informed about: how does IIS detect new code?

consultant_mcn

External

Since: Oct 08, 2003
Posts: 200

(Msg. 7) Posted: Tue Jul 24, 2007 8:10 am Post subject: Re: how does IIS detect new code? [Login to view extended thread Info.] Archived from groups: per prev. post (more info?)

iis does not recycle on its own. if you deploy new code written for aspnet 2, you must configure the virtual site/directory to use the 2.0 framework. also, you must have a separate app pool for aspnet 2.0 apps and aspnet 1.1 apps, as they will clobber each other. "Jason" <Jason.TakeThisOut@discussions.microsoft.com> wrote in message news:D8E6CF06-0CB8-411A-AD7E-981E6F563CAB@microsoft.com... > so short of ISAPI code, it shouldn't be needed. > > what about if the deployment changes the framework from 1.1 to 2.0 > > does that cause IIS to recycle automatically? or does it do it all on the > fly as well? > > "David Wang" wrote: > >> Your question is actually about web application deployment, and the >> specifics depend on the web application itself. This means that IIS >> has no web application deployment features. >> >> For example, if it is an ASP.Net application, changes to /bin DLLs >> and .aspx pages are dynamically detected and handled. This is a nice >> feature of the ASP.Net platform -- detecting changes in binaries and >> dynamically reloading the changes -- but it is also a problem because >> it keeps the older version loaded as well for garbage collection. >> >> If it is an ISAPI application, then you must unload the ISAPI DLL >> from memory before you can replace it with the new binary. This can be >> done by recycling the application pool(s) that load the ISAPI DLL. >> >> So, I would not say it is a best practice to recycle following a code >> change, nor is the question about IIS robustness. It is about the >> developer knowing the deployment needs of his application and how to >> fulfill them. Stopping the Application Pool, making changes, and >> Restarting the Application Pool is a consistent way to ensure >> application changes propagate, but it may not be the best nor only >> choice for you situation. >> >> >> //David >> http://w3-4u.blogspot.com >> http://blogs.msdn.com/David.Wang >> // >> >> >> >> >> >> >> On Jul 23, 7:14 am, Jason <Ja....TakeThisOut@discussions.microsoft.com> wrote: >> > so the app pool does not need to recycle to start using the new code >> > then? >> > >> > is it a best practice to recycle following a code change? or is IIS >> > supposed to be robust enought to handle that? >> > >> > >> > >> > "Ken Schaefer" wrote: >> > > IIS subscribes to Windows file change notifications, which notifies >> > > subscribers that the file(s) have changed. >> > >> > > Cheers >> > > Ken >> > >> > > -- >> > > My IIS Blog:www.adOpenStatic.com/cs/blogs/ken >> > >> > > "Jason" <Ja....TakeThisOut@discussions.microsoft.com> wrote in message >> > >news:6AD64CC3-BBEF-493A-8826-B2A1CA13B3EF@microsoft.com... >> > > > In the scenario where an application is running and in memory, >> > > > serving >> > > > users, >> > > > then new code is deployed to the server (e.g. using ms application >> > > > center), >> > > > how does IIS know to pick up and start using the new code?- Hide >> > > > quoted text - >> > >> > - Show quoted text - >> >> >> >> Stay informed about: how does IIS detect new code?

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