Won't you have problems with instances that live around the time you
update content?

When you send the update request, that instance will update it's dict
(and memcache and the datastore). If you have another instance alive
at that time, it won't know about the update and will continue serving
the old one. If your update happens at a predictable time you could
make the cache logic reload from the datastore, but for unpredictable
updates this technique will break if your app scales above one
instance.

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