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gae

Postby BlueWater on Sun Oct 30, 2011 9:04 pm

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Google App Engine is a platform as a service (PaaS) cloud computing platform for developing and hosting web applications in Google-managed data centers.App Engine automatically allocates more resources for the web application to handle the additional demand.

Google App Engine enables you to build and host web apps on the same systems that power Google applications. App Engine offers fast development and deployment; simple administration, with no need to worry about hardware, patches or backups; and effortless scalability.

Google App Engine is free up to a certain level of consumed resources.The App Engine platform provides amazing services such as Task Queue, XMPP, and Prospective search, all powered by the same infrastructure that powers Google's applications.

Bulk downloading

SDK version 1.2.2 adds support for bulk downloads of data using Python.The open source Python projects gaebar,approcket, and gawsh also allow users to download and backup App Engine data.
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BlueWater
 
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gae

Postby BlueWater on Sun Oct 30, 2011 9:21 pm

Differences

Compared to other scalable hosting services,App Engine provides more infrastructure to make it easy to write scalable applications, but can only run a limited range of applications designed for that infrastructure.

While other services let users install and configure nearly any *NIX compatible software, App Engine requires developers to use only its supported languages, APIs, and frameworks.

Google App Engine's datastore has a SQL-like syntax called "GQL". GQL intentionally does not support the Join statement, because it seems to be inefficient when queries span more than one machine.

Developers worry that the applications will not be portable from App Engine and fear being locked into the technology. In response, there are a number of projects to create open-source back-ends for the various proprietary/closed APIs of app engine, especially the datastore.

The GAE Java servlet container uses the Jetty Web Server,[23] an open source project that implements the 2.5 servlet specification.
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