In the tech report, Above the Clouds: A Berkeley View of Cloud Computing, published by Professors in UC Berkeley Reliable Adaptive Distributed Systems Laboratory, these authors talked about almost every aspects of Cloud Computing and predict the future of Cloud Computing.
1. Executive Summary
The services themselves have long been referred to as Software as a Service(SaaS). The datacenter hardware and software are what we call a Cloud.
When a Cloud is made available i a pay-as-you-go manner to the general public, we call it a Public Cloud. The service being sold is Utility Computing.
Private Cloud is used to refer to internal datacenters of a business or other organization, not made available to the general public.
Cloud Computing is the sum of SaaS and Utility Computing, but does not include Private Clouds, according to the Berkeley professors.
From a hardware point of view, three aspects are new in Cloud Computing:
(1). The illusion of infinite computing resources available on demand.
(2). The elimination of an up-front commitment by Cloud users.
(3). The ability to pay for use of computing resources on a short-term basis as needed.
Any application needs a model of computation, a model of storage, and a model of communication.
Google AppEngine is targeted exclusively at traditional web applications, enforcing an application structure of clean separation between a stateless computation tier and a stateful storage tier.
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