Month: March 2024

Introduction It’s widely recognized that the bulk of software costs arise after its initial development in maintenance tasks like bug fixes, feature additions, and day-to-day operation. Therefore, it’s crucial to build systems that are easy to modify, extend, and operate, ensuring they remain maintainable over time. Robust testing, including unit, integration, and end-to-end tests, is

Introduction Chapter 24 – Common Failure Causes Chapter 25 – Redundancy Redundancy, the replication of functionality or state, is a critical defense against failures. When replicated over multiple nodes, functionality or state can be maintained even if a node fails. This redundancy not only enhances availability but also enables horizontal scaling, as discussed in Part

Introduction Scaling an application involves maintaining performance as load increases. The long-term solution for increasing capacity is to architect for horizontal scalability. In this section, we’ll explore scaling a simple CRUD web application called Cruder, consisting of a single-page JavaScript application communicating with an application server via a RESTful HTTP API. The server uses local

Introduction Our ultimate goal is to build a distributed application consisting of a group of processes that gives its users the illusion they are interacting with one coherent node. While achieving a perfect illusion may not always be possible or desirable, some degree of coordination is always needed to build a distributed application. Chapter 6