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301 high scalability-2008-04-08-Google AppEngine - A First Look


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Source: html

Introduction: I haven't developed an AppEngine application yet, I'm just taking a look around their documentation and seeing what stands out for me. It's not the much speculated super cluster VM . AppEngine is solidly grounded in code and structure. It reminds me a little of the guy who ran a website out of S3 with a splash of Heroku thrown in as a chaser. The idea is clearly to take advantage of our massive multi-core future by creating a shared nothing infrastructure based firmly on a core set of infinitely scalable database, storage and CPU services. Don't forget Google also has a few other services to leverage: email, login, blogs, video, search, ads, metrics, and apps. A shared nothing request is a simple beast. By its very nature shared nothing architectures must be composed of services which are themselves already scalable and Google is signing up to supply that scalable infrastructure. Google has been busy creating a platform of out-of-the-box scalable services to build


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sentIndex sentText sentNum sentScore

1 By its very nature shared nothing architectures must be composed of services which are themselves already scalable and Google is signing up to supply that scalable infrastructure. [sent-8, score-0.335]

2 CGI is the perfect metaphor for our brave new app container world: get a request, process the request, die, repeat. [sent-15, score-0.348]

3 Using AppEngine you have no choice but to write an app that can be splayed across a pointy well sharpened CPU grid. [sent-16, score-0.286]

4 You basically make a Python app using services and it scales. [sent-33, score-0.355]

5 If email needs to be sent every hour, for example, who will invoke your service every hour so you can get the CPU to send the email? [sent-45, score-0.286]

6 - An application can only access other computers on the Internet through the provided URL fetch and email services and APIs. [sent-63, score-0.313]

7 An app can read files, but only files uploaded with the application code. [sent-66, score-0.417]

8 The app must use the App Engine datastore for all data that persists between requests. [sent-67, score-0.381]

9 A request handler cannot spawn a sub-process or execute code after the response has been sent. [sent-69, score-0.3]

10 An update of a entity occurs in a transaction that is retried a fixed number of times if other processes are trying to update the same entity simultaneously. [sent-76, score-0.243]

11 Your application can assign entities to groups when the entities are created. [sent-80, score-0.443]

12 You've got mail: Applications can also send email messages using App Engine's mail service. [sent-81, score-0.25]

13 The mail service also uses Google infrastructure to send email messages. [sent-82, score-0.302]

14 You can bundle a framework of your choosing with your application code by copying its code into your application directory. [sent-98, score-0.373]

15 Google has their own framework called webapp . [sent-99, score-0.244]

16 Here's a hello world application using webapp: import wsgiref. [sent-101, score-0.261]

17 When webapp receives an HTTP GET request to the URL /, it instantiates the MainPage class and calls the instance's get method. [sent-116, score-0.381]

18 webapp sends a response based on the final state of the MainPage instance. [sent-121, score-0.31]

19 The parameter debug=true passed to its constructor tells webapp to print stack traces to the browser output if a handler encounters an error or raises an uncaught exception. [sent-124, score-0.285]

20 When your application is running on App Engine, users will be directed to the Google Accounts sign-in page, then redirected back to your application after successfully signing in or creating an account. [sent-128, score-0.379]


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