building a scalable architecture for web apps.ppt

Building a Scalable Architecture for Web Apps - Part I(Lessons Learned @ Directi)
By Bhavin Turakhia
CEO, Directi
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Licensed under mons Attribution Sharealike mercial
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Agenda
Why is Scalability important
Introduction to the Variables and Factors
Building our own Scalable Architecture (in incremental steps)
Vertical Scaling
Vertical Partitioning
Horizontal Scaling
Horizontal Partitioning
… etc
Platform Selection Considerations
Tips
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Why is Scalability Important in a Web world
Viral marketing can result in instant esses
RSS / Ajax / SOA
pull based / polling type
XML protocols - Meta-data > data
Number of Requests exponentially grows with user base
RoR / Grails – Dynamic language landscape gaining popularity
In the end you want to build a Web app that can serve millions of users with ZERO downtime
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The Variables
Scalability - Number of users / sessions / transactions / operations the entire system can perform
Performance – Optimal utilization of resources
Responsiveness – Time taken per operation
Availability - Probability of the application or a portion of the application being available at any given point in time
Downtime Impact - The impact of a downtime of a server/service/resource - number of users, type of impact etc
Cost
Maintenance Effort
High: scalability, availability, performance & responsivenessLow: downtime impact, cost & maintenance effort
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The Factors
Platform selection
Hardware
Application Design
Database/Datastore Structure and Architecture
Deployment Architecture
Storage Architecture
Abuse prevention
Monitoring mechanisms
… and more
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Lets Start …
We will now build an example architecture for an example app using the following iterative incremental steps –
Inspect current Architecture
Identify Scalability Bottlenecks
Identify SPOFs a