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Articles and publications tagged Caching across the Atmosphere.

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Today I LearnedAug 16, 2026

HTTP Entity Tags

Cache validation and conditional updates with ETag, If-None-Match, and If-Match

LinuxLinksJun 26, 2026

Apache Geode – distributed, in-memory data management platform

Documentscaching

LinuxLinksJun 26, 2026

Infinispan – distributed, in-memory database and data grid

Documentscaching

wirres.net

wirres.netJun 6, 2026

aus dem maschinenraum 06.06.2026

ich habe ein paar kleinigkeiten am layout und an den funktionen von wirres.net angepasst. ich …

Sahil Kapoor's PlaybookMay 12, 2026

Valkey is an open-source, BSD-licensed fork of Redis created in 2024 after Redis Ltd relicensed the Redis source from BSD to a dual SSPL/RSALv2 model that the Linux Foundation, AWS, Google Cloud, Oracle, and others judged unsuitable for open distribution. Valkey is now governed by the Linux Foundation and is API-compatible with Redis 7.2. Why the fork happened Redis was permissively licensed (BSD) for most of its life. In 2024 the project switched to SSPL and RSALv2, which restrict cloud prov

RedisIn-memory Database

Sahil Kapoor's PlaybookMay 12, 2026

In-memory Database

An in-memory database keeps its primary dataset in RAM rather than on disk, trading capacity and durability tradeoffs for orders-of-magnitude lower read and write latency. In-memory engines back almost every cache, session store, leaderboard, rate limiter, and many real-time analytics systems. Common engines * Redis. The dominant in-memory key-value store; rich data structures, optional persistence (RDB, AOF), replication, cluster sharding. * Memcached. Pure cache; no persistence; multi-thr

Sahil Kapoor's PlaybookMay 12, 2026

A cache stampede (or thundering herd) is the failure mode where many concurrent requests for the same hot key all miss the cache at the same time, hit the origin simultaneously, and overwhelm it. Stampedes typically happen the instant a popular key expires, when a cache is cold-started, or when a downstream system briefly fails and recovers. How it happens Consider a homepage feed cached with a 60-second TTL. Hundreds of requests per second hit the cache and get a fast cached response. The mo

Sahil Kapoor's PlaybookMay 12, 2026

TTL (Time To Live) is the duration for which a cached value, DNS record, or other transient piece of data remains valid. After the TTL expires, the entry is considered stale and either evicted, refreshed, or revalidated. TTL is one of the simplest knobs in cache design with outsized impact on hit rate and freshness. How it appears in different systems * Caches: per-key TTL on Redis or Memcached entries; sets the lifetime independent of the eviction policy. * HTTP: Cache-Control: max-age=360

Sahil Kapoor's PlaybookMay 12, 2026

Eviction Policy

An eviction policy is the rule a cache uses to decide which entry to remove when it reaches its memory limit and needs to make room for a new entry. Choice of policy directly affects hit rate and is one of the most consequential cache configuration decisions. Common policies * LRU (Least Recently Used). Evict the entry that has not been accessed for the longest time. Default in many systems; good for workloads with recent-bias. * LFU (Least Frequently Used). Evict the entry with the lowest

Sahil Kapoor's PlaybookMay 12, 2026

Memcached is an open-source, high-performance, distributed in-memory key-value cache, originally designed to speed up dynamic web applications by reducing database load. It is one of the oldest and most widely deployed caching systems, often paired with relational databases for read-heavy workloads. How it works Memcached stores arbitrary string keys mapped to arbitrary byte values, with a per-entry TTL. The protocol is intentionally simple: get, set, add, delete, incr, decr. There is no buil

Sahil Kapoor's PlaybookMay 12, 2026

A Content Delivery Network (CDN) is a distributed network of edge servers that cache and serve content from locations close to the user, instead of every request reaching the origin server. CDNs reduce latency, offload traffic from the origin, and improve resilience to traffic spikes and regional outages. How it works When a user requests an asset, DNS or anycast routing directs them to the nearest edge point of presence (PoP). If the edge has a cached copy, it serves the response directly. I

Sahil Kapoor's PlaybookMar 27, 2026

Redis (Remote Dictionary Server) is an in-memory data store that holds its dataset in RAM for sub-millisecond access. Beyond simple key-value, Redis supports rich data structures including strings, hashes, lists, sets, sorted sets, streams, bitmaps, and HyperLogLog. How it works A Redis server accepts commands over a simple text protocol (RESP). Commands are executed single-threaded, which keeps semantics simple and operations on a single key atomic. Replication is asynchronous primary-replic

CachingMemcached

Sahil Kapoor's PlaybookMar 2, 2026

Synchronized Expiration in Distributed Systems

Deterministic TTL in caching systems create hidden synchronization points that eventually break under scale. This deep dive explains how mature systems design for expiration, not just performance.

TTLdistributed systems

Tim DeschryverJan 16, 2026

Using FusionCache's Backplane to synchronize HybridCache instances across multiple instances

HybridCache is a great caching solution but it doesn't sync in-memory caches across instances. Discover how FusionCache can help you achieve this (and much more) with its Backplane feature.

luminary.blogNov 5, 2025

Single-Flight Pattern

How the single-flight pattern can prevent race conditions

concurrencycaching

Scott Spence

Scott SpenceMar 17, 2023

Caching with Fathom, Redis, and SvelteKit

I had a bit of a surprise land in my inbox at the start of the month from my analytics provider Fathom, the subject line “You’ve been quite popular”. Not the good type of surprise though! 😅

analyticssveltekit

Angular-Buch

Angular-BuchJul 24, 2019

Mach aus deiner Angular-App eine PWA

Immer häufiger stößt man im Webumfeld auf den Begriff der Progessive Web App – kurz: PWA. Doch was genau steckt dahinter und welche Vorteile hat eine PWA gegenüber einer herkömmlichen Webanwendung oder einer App? Als Progressive Web App bezeichnen wir eine Webanwendung, die beim Aufruf einer Website als App auf einem lokalen Gerät installiert werden kann – zum Beispiel auf dem Telefon oder Tablet. Die PWA lässt sich wie jede andere App nutzen, inklusive Push-Benachrichtigungen!

PWAProgressive Web App

k9n.dev

k9n.devJul 24, 2019

Mach aus deiner Angular-App eine PWA

Immer häufiger stößt man im Webumfeld auf den Begriff der Progessive Web App – kurz: PWA. Doch was genau steckt dahinter und welche Vorteile hat eine PWA gegenüber einer herkömmlichen Webanwendung oder einer App? Als Progressive Web App bezeichnen wir eine Webanwendung, die beim Aufruf einer Website als App auf einem lokalen Gerät installiert werden kann – zum Beispiel auf dem Telefon oder Tablet. Die PWA lässt sich wie jede andere App nutzen, inklusive Push-Benachrichtigungen!

PWA (Progressive Web App)Angular

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