<div>I'm thinking of a strategy where default cache expirations are really long. However, if any updates are made, the expiration is changed to 3 minutes (if the existing cache expiration is longer than 3 minutes). This way for popuplar items, the refresh isn't constatn, rendering Memcache useless. At the same time, the cache isn't refreshed unnecessarily when there aren't any changes.
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<div>What do you guys think of this?</div>