Basically it is because of the way the content cache is working, as far as I recall. The issue is that in a web garden, each process would get it's own version of the cache, which would mean that they get out of sync really fast. So depending on which process is serving the request, the cache of published content will be different.
In my experience most hosting companies do just give you one app pool, but you might want to double check before signing up with a host.
Umbraco in web garden
Hello,
From what I understand, Umbraco is not supported to run on web gardens (ie shared application pool). I have not however found any docs on the reason for this other than Niels post in this: http://our.umbraco.org/forum/ourumb-dev-forum/bugs/5951-Load-Balance-Issues thread.
So what are the reasons? Many hosting providers (from what I unserstand) can not support a single app-pool for my installations.
Basically it is because of the way the content cache is working, as far as I recall. The issue is that in a web garden, each process would get it's own version of the cache, which would mean that they get out of sync really fast. So depending on which process is serving the request, the cache of published content will be different.
In my experience most hosting companies do just give you one app pool, but you might want to double check before signing up with a host.
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