The application I'm working on is going to have a Mongo upgrade from Version 3.3 to 3.4 What all do we need to test and should care about apart from the general system sanity and regression?
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With any kind of framework or database upgrade like this, after I'd covered system sanity and critical path regression, I would go through the release notes looking for any changes likely to impact my application and test around each of those.
I'd be particularly careful with these areas, in this approximate order of priority: