Introduction The CAP Theorem, proposed by Eric Brewer in 2000 and later proven by Gilbert and Lynch in 2002, is a foundational principle in distributed systems design. It states that a distributed system cannot simultaneously guarantee Consistency (C), Availability (A),…

Introduction Content Delivery Networks (CDNs) are distributed systems designed to optimize the delivery of static and dynamic content by caching data at edge locations closer to users, reducing latency, improving throughput, and offloading origin servers. CDNs are critical for applications…

Introduction Latency, the time delay between a request and its response, is a critical performance metric in modern distributed systems, directly impacting user experience, system throughput, and scalability. High latency can degrade application performance, leading to user dissatisfaction (e.g., 100ms…

Introduction A Bloom filter is a probabilistic data structure designed for space-efficient membership testing, enabling rapid queries to determine whether an element is likely present in a set. It is widely used in applications requiring high performance and low memory…

Introduction Redis (Remote Dictionary Server) is a high-performance, in-memory, key-value data store celebrated for its sub-millisecond latency (< 1ms), high throughput (up to 100,000 req/s per node), and versatility across diverse applications. Its optimized architecture, efficient data structures (e.g., Hash…

Introduction Redis (Remote Dictionary Server) is an open-source, in-memory, key-value data store renowned for its exceptional performance, achieving sub-millisecond latency (< 1ms) and high throughput (up to 100,000 req/s per node). Widely used as a cache, database, and message broker…

Introduction Cache eviction policies are critical mechanisms in caching systems to manage limited memory by determining which items to remove when the cache reaches capacity. These policies ensure efficient use of cache memory, maintaining high hit rates and low latency…

Introduction Caching is a cornerstone of high-performance system design, enabling rapid data access, reduced latency, and alleviation of backend database load in applications such as e-commerce, social media, and streaming services. By storing frequently accessed data in fast, typically in-memory…

Concept Explanation Distributed caching systems are specialized data storage solutions designed to store frequently accessed data in memory across multiple nodes, significantly improving application performance by reducing latency and offloading backend databases. Unlike traditional in-memory caching on a single server,…