基于云的服务正在以极高的速度增长和扩展。软件作为服务（SaaS）正在成为应用程序开发的规范，主要因为需要提供这些基于云的服务。SaaS应用特别敏感的尺度问题由于其多租户性质。随着我们的世界的变化，我们越来越关注SaaS服务，基于云的服务和大容量应用程序，缩放变得越来越重要。我们的规模和复杂性似乎没有尽头。云应用程序可以增长。(Cloud-based services are growing and expanding at extremely high speeds. Software
as a Service (SaaS) is becoming the norm for application development, primarily
because of the need for providing these cloud-based services. SaaS applications are
particularly sensitive to scaling issues due to their multitenant nature.)