Building a Scalable Architecture for Web Apps.ppt

Intelligent People. mon Ideas. 1 1 Building a Scalable Architecture for Web Apps - Part I (Lessons Learned @ Directi ) By Bhavin Turakhia CEO, Directi ( | http://wiki. | http:// careers. ) Licensed under mons Attribution Sharealike mercial 2 2 mons Sharealike Attributions mercial 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 3 3 mons Sharealike Attributions mercial 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 4 4 mons Sharealike Attributions mercial 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 & responsiveness Low : downtime impact, cost & maintenance effort 5 5 mons Sharealike Attributions mercial The Factors ? Platform selection ? Hardware ? Application Design ? Database/ Datastore Structure and Architecture ? Deployment Architecture ? Storage Architecture ? Abuse prevention ? Monitoring mechanisms ?… and more 6 6 mons Sharealike Attributions mercial Lets Start …? We will now build an example arc