How To Build Highly Scalable Web Applications For The Cloud

Scalability in the cloud depends a lot on application design.  Keep these important points in mind when you are designing your web application and you will scale much more naturally and easily in the cloud.

** Original article — Intro to EC2 Cloud Deployments **

1. Think twice before sharding

  • It increases your infrastructure and application complexity
  • it reduces availability – more servers mean more outages
  • have to worry about globally unique primary keys

2. Bake read/write database access into the application

  • allows you to check for stale data, fallback to write master
  • creates higher availability for read-only data
  • gracefully degrade to read-only website functionality if master goes down
  • horizontal scalability melds nicely with cloud infrastructure and IAAS

3. Save application state in the database

  • avoid in-memory locking structures that won’t scale with multiple web application servers
  • consider a database field for managing application locks
  • consider stored procedures for isolating and insulating developers from db particulars
  • a last updated timestamp field can be your friend

4. Consider Dynamic or Auto-scaling

  • great feature of cloud, spinup new servers to handle load on-demand
  • lean towards being proactive rather than reactive and measure growth and trends
  • watch the procurement process closely lest it come back to bite you

5. Setup Monitoring and Metrics

  • see trends over time
  • spot application trouble and bottlenecks
  • determine if your tuning efforts are paying off
  • review a traffic spike after the fact

The cloud is not a silver bullet that can automatically scale any web application.  Software design is still a crucial factor.  Baking in these features with the right flexibility and foresight, and you’ll manage your websites growth patterns with ease.

Have questions or need help with scalability?  Call us:  +1-212-533-6828