This article explains why caching is essential for high‑performance data retrieval, compares LRU and LFU eviction policies, presents three Redis‑based cache implementations, and discusses consistency challenges and solutions such as eviction ordering, consistent hashing, and delayed eviction in distributed systems.
This article explains the fundamentals of caching, why caches are needed, describes common replacement policies such as LRU, LFU, FIFO, ARC, and provides Java code examples for each algorithm, helping developers choose and implement the right cache strategy for their applications.
The article blends a humorous interview scenario with a thorough explanation of caching concepts, including definitions, hit/miss mechanics, eviction strategies, and detailed Java implementations of algorithms such as LFU, LRU, FIFO, ARC, and Random Cache, illustrating how to choose and code cache policies.
Redis provides a configurable maxmemory setting to limit memory usage, and offers several eviction policies—including allkeys‑lru, volatile‑lru, and random strategies—implemented via an approximate LRU algorithm whose behavior can be tuned with maxmemory‑samples, allowing administrators to balance performance and memory reclamation.
The article reviews three cache update strategies—algorithmic eviction (LRU/LFU/FIFO), timeout‑based eviction, and proactive updates—analyzing their consistency guarantees and maintenance costs, and then proposes a combined best‑practice approach for reliable backend caching.
Bolt is a high‑performance real‑time image cropping and compression server that processes each image only once, uses an LRU cache to limit memory, and offers flexible command‑line options for installation, usage, and scaling on CPU‑rich servers.
This article explains how to start Memcached with specific parameters, describes the resulting slab class configuration, illustrates memory allocation with pages, chunks, and slabs, and discusses item placement, waste, and the per‑slab LRU eviction policy in detail.
This article examines how popular caching systems such as Redis, Memcached, Guava Cache, and Ehcache implement eviction policies like LRU, LFU, and FIFO, comparing their algorithmic approaches, code implementations, and expiration handling mechanisms.
