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Type: Bug
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Resolution: Fixed
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Priority: Blocker - P1
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None
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Affects Version/s: None
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Component/s: None
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Labels:None
https://docs.mongodb.com/manual/release-notes/3.4-downgrade/
Section 2:
In each database that contains views, drop the system.views collection to drop all views in that database.
Users in deployments with authorization enabled cannot drop system collections.
This breaks the downgrade process for anyone using auth that has ever created a view.