FEATURE REQUEST: If pre_upgrade fails, revert canister to earlier state snapshot of before pre_upgrade ran and discard current pre_upgrade logic

[paulyoung]

@roman-kashitsyn

Note that nothing stops you from calling the pre_upgrade hook from your post_upgrade hook. You don’t need a new system feature for that.

I suppose the trade off here is that it could be an expensive operation.

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@roman-kashitsyn

Note that nothing stops you from calling the pre_upgrade hook from your post_upgrade hook. You don’t need a new system feature for that.

There was a feature mentioned at some point that would allow backing up and restoring canisters.

Not only might that mitigate some of the risk around upgrades, it could potentially be used to test upgrades locally with a similar volume of data as in a production environment.