Scalable And Usable Web Applications

ArcReady: Architecting for Scalable and Usable Web Applications

Agenda
SESSION 1: Architecting for Scalable Web Applications
15 Min Break
SESSION 2: Architecting for Usable Web Applications
Evals & Raffle

About Me
Clint Edmonson
Architect Evangelist
[email_address]
http://www.notsotrivial.net

SESSION 1: Architecting for Scalable Web Applications

So you have a scalability problem? Congratulations!

References
“ Running a megasite on Microsoft Technologies” (MIX06)
“ Myspace.com: Megasite V2” (MIX07)
“ Amazon.com's Simple Storage Service, Elastic Compute Cloud, and Simple Queue Service” (SAF07)
“ Building Scalable Web Sites” Book by Cal Henderson – Flickr architect

Scalability <> Performance

Scalability is how your application behaves as the number of users increases

Performance is how your application behaves when there is just one user

Number of Requests Cost per Request

Load <> Stress

Load is how many simultaneous users your application can serve

Stress is how well your application behaves when resources become limited

Where are the scalability limits? Network Database Web server Code

Pattern: Nickel Defense

Pattern: Scale Up

CASE STUDY: Scaling up with IIS7 at Dell.com

Simplified server management
Fewer servers, reduced costs
Improved performance
Deploy Windows Server ® 2008 Enterprise operating system with Internet Information Services 7.0
Implement fully automated server and application deployment
Simplify management of servers that run Dell.com
Reduce number of servers and rate of server growth
Improve site performance to maintain good user experience
Dell simplifies server management, lowers costs, and increases Dell.com Performance “ Our vision for the Dell.com architecture absolutely requires the new features in Windows Server 2008, which is key to our ability to simplify our online commerce environment.” Ben May, Senior Systems Engineer, Dell

PATTERN: Scale Out

PATTERN: Specialize Web Services Image Server Web Application

PATTERN: Split the application msdn.microsoft.com technet.microsoft.com microsoft.com

PATTERN: Split the database 1 Reference Transaction

PATTERN: Split the database 2 Write Copy Read Copy Read Copy

PATTERN: Geo Distribution

PATTERN: Offload the work

Anti-patterns
Spending all your time looking at the code
Caching everything (twice!)
Services calling services (especially across the network)

DEMO: Team System Load Testing

Discussion: “Scale Later”

BREAK: 15 Minutes

SESSION 2: Architecting for Usable Web Applications

PART 1: What’s the Secret Formula?

What’s your favorite application?

What application do you use the most ?

Effective Satisfying Efficient Useful Adaptive Reliable Cost-effective Desirable Usable

Experience Engineering User Needs Interaction Design Information Design Visual Design Experiences that create value! + + +

PART 2: What is our palette?

Application Archetypes Information / Reference E-Commerce Data Viewer/Editor Utility Entertainment Document Viewer/Editor

UX Continuum SharePoint ASP.NET+AJAX Gadgets RIAs Infopath OBA Winforms WPF XNA Ubiquity Richness Next Generation

SharePoint Sites

Standards Based Web Apps (ASP.NET + AJAX & Mashups)

Gadgets

Rich Internet Applications (Silverlight)

Infopath Forms

Office Business Applications

Standards Based Windows Applications (Winforms)

WPF Applications

XNA Applications

DEMO: UX IQ

PART 3: Best Practices

Form follows function

Create a set of design tenets

Use the appropriate level of fidelity

DEMO: ProtoXAML

Build with the customer and user’s input

Build for ease of use ..but don’t forget the power users 70 20 10

Plan for concurrency

Balance the computing load

Balance security with usability

Build for supportability & maintenance

What are some of your best practices?

Contact Me
Clint Edmonson
Architect Evangelist
[email_address]
http://www.notsotrivial.net

Scalable And Usable Web Applications

by Clint Edmonson on May 02, 2008

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