Introduction to Google App Engine

App Engine Google's Cloud Computing Platform Rajdeep Dua Anirudh Dewani Google Developer Relations

Topics of discussion

Cloud Computing Defined

Classification of Cloud Computing Players

What is App Engine?

Why App Engine?

Application Lifecycle with App Engine

Development using App Engine

Deploying Applications

Security

Quota & Pricing

What's next ?

Cloud Computing Defined

source : Merrill Lynch IDC Saas Report, May 2008

What is App Engine?

Google's Platform to build Web applications on the cloud

Dynamic web server, with full support for common web technologies

Automatic scaling and load balancing

Transactional DataStore Model

Integration with Google Accounts through APIs.

Why App Engine?

App Engine Application Lifecycle

Development Cycle App Engine SDK App Engine Admin Console

App Engine Physical Deployment Diagram Node 1 Node 2 Node 3 Node N Google Cluster1 Node 1 Node 2 Node 3 Node N Google Cluster N Node 1 Node 2 Node 3 Node N Datastore Cluster1 Node 1 Node 2 Node 3 Node N Datastore Cluster M Python web server Persistent Layer HTTP Request HTTP Response

Developing applications using App Engine

App Engine SDK

Web server

dev_appserver.py

Application uploader

appcfg.py

Local DataStore implemetation

App Engine APIs

Developing Application with AppEngine

Application Configuration - app.yaml application: helloworld version: 1 runtime: python api_version: 1 handlers: - url: /.* script: helloworld.py yaml (yet another markup language) - Deployment Descriptor for the Application Maps URLs to the handlers

Runtime Components of an Application deployed on App Engine URL Python Handlers /*.html HtmlHandler /*.form FormHandler app.yaml (deployment descriptor) WebApp Framework (Google’s Web framework) Django Framework (Third Party) WebOb Framework (Third Party) Mail APIs Users APIs MemCache API Data Store APIs Python Runtime

Request Handler - helloworld.py

App Engine DataStore

A powerful non relational distributed data storage service

Query Engine

GQL - SQL like language

Transactional persistence with a simple API

DataStore API

DataStore - Runtime components

App Engine DataStore Entity from db.Model Persisting An Entity

GQL GQL

Realization - App Engine Request

Testing and Deployment

Local testing

dev_appserver.py helloworld/

Deploy

appcfg.py update helloworld/

On the cloud

http://<application-id>.appspot.com

APIs

Secure Sandbox

Quotas & Road map

Quota Apps per developer 3 Storage per App 500 MB Files per App 1000 Size per file 1MB Emails per Day 2000 Bandwidth In per Day 10,000 MB Bandwidth Out per Day 10,000 MB CPU Megacycles per Day 200 Million HTTP Requests per Day 650,000 Datastore API Calls per Day 2.5 Million URLFetch API Calls per Day 160,000 $0.10 - $0.12 per CPU core-hour $0.15 - $0.18 per GB-month of storage $0.11 - $0.13 per GB outgoingbandwidth $0.09 - $0.11 per GB incoming bandwidth Expected Pricing Daily Free Quota Fixed Quota

What's Next