> If I had a dozen App servers and one DB would my all my app servers be
> notified via sweepers when a given representation was updated?  If not
> what cache expiring mechanisms are there that can be used across multi
> app servers?
No.  I''m assuming you mean you are caching a page to disk on several  
separate servers and then something on that page changes and you  
expire it, will all servers expire it.  No.
You could use a central memcache store, but that won''t be as fast as  
page caching.  Or you can have each app server use a central disk  
(SAN, etc.).  Or you can write something that tells each server to  
expire a page.  Perhaps by overriding expire_page().
-philip
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