Sharding

Introduction Retrieval‑Augmented Generation (RAG) has become the de‑facto pattern for building intelligent applications that combine the creativity of large language models (LLMs) with the precision of external knowledge sources. While the classic RAG loop—query → retrieve → augment → generate—works well for batch or low‑latency use‑cases, many modern products demand real‑time responses at sub‑second latency, massive concurrency, and the ability to evolve the knowledge base continuously. Achieving this level of performance forces architects to rethink three core components: ...

Introduction Retrieval‑Augmented Generation (RAG) has reshaped the way developers build knowledge‑aware applications. By coupling large language models (LLMs) with a vector store that can quickly surface the most relevant chunks of text, RAG pipelines enable: Up‑to‑date answers that reflect proprietary or frequently changing data. Domain‑specific expertise without costly fine‑tuning. Scalable conversational agents that can reason over millions of documents. When you add autonomous agents—LLM‑driven programs that can decide which tool to call, when to retrieve, and how to iterate on a response—the possibilities expand dramatically. However, real‑world workloads quickly outgrow a single monolithic vector collection. Latency spikes, storage costs balloon, and multi‑tenant requirements become impossible to satisfy. ...

Table of contents Introduction High-level overview: goals and building blocks Key distribution: hash slots and key hashing Cluster topology and the cluster bus Replication, failover and election protocol Client interaction: redirects and MOVED/ASK Rebalancing and resharding Failure detection and split-brain avoidance Performance and consistency trade-offs Practical tips for operating Redis Cluster Conclusion Resources Introduction Redis Cluster is Redis’s native distributed mode that provides horizontal scaling and high availability by partitioning the keyspace across multiple nodes and using master–replica groups for fault tolerance[1]. This article explains the cluster’s internal design and runtime behavior so you can understand how keys are routed, how nodes coordinate, how failover works, and what trade-offs Redis Cluster makes compared to single-node Redis[1][2]. ...