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by contingencies 4749 days ago
Once you have two providers, you are forced to only use the features offered by each of them and use an abstract layer (API agnostic dev).

Abstraction layers don't necessarily need to produce lowest common denominator results.

Plus, AWS offers a wide range of strategies to ensure the availability of its infrastructure (Availability Zone, Regions, CDN etc.)

You still wind up vulnerable to quirks of the single provider though! For example, account freeze for whatever reason (financial quirks, legal issues, regulatory change) any multi-site failures (eg. financial, operational, legal, security) at that provider.
1 comments
randallsquared 4749 days ago
> Abstraction layers don't necessarily need to produce lowest common denominator results.

Except in the special case that you can build the functionality not provided by using other functionality that is, I think they do, since otherwise it's leaking. A leaky abstraction is often worse than none.

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contingencies 4748 days ago
I think your assumption is that cloud providers with different features cannot be abstracted without making the whole abstraction 'leaky'.

While your perspective may hold for a traditional, rigid, single-layer, abstraction layer with the most simplistic, binary-level feature presence, it does not hold for better formed solutions. From https://en.wikipedia.org/wiki/Abstraction_layer: All problems in computer science can be solved by another level of indirection (David Wheeler).

Some real world differences between cloud providers: available hardware, available installation images (OS images), available bandwidth, available logical location on the internet, available physical location (legal jurisdiction, etc.), scale-out time, cost model.

How do you conceive of these differences, and then deploy arbitrary services to an arbitrary number of individual instances running unique combinations of cloud provider specific features on unique cloud-provider deployed OS images in parallel? There are various approaches, but it's not that hard to come up with a functional set of abstractions. Think about it.

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