Key Points

  • Scalable applications can handle increased usage or data

    • Choose scalable application designs

      • Design simple application architectures

      • Design to scale out

      • Partition data effectively

    • Design application infrastructure to scale

      • Load balance with hardware

      • Choose the appropriate hardware

      • Use common cluster configurations

  • Scalable applications are always available and fault tolerant

    • Defend against application failure

      • Ensure that the application is fault tolerant

      • Build redundancy into the application

    • Insulate against dependency failures

  • Scalable applications are manageable and maintainable

    • Ensure manageability and maintainability

      • Instrument the application code

      • Establish key live site metrics and goals

      • Plan for disasters

      • Invest in change management

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