# golang/groupcache

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13,326 stars · 1,402 forks · Go · apache-2.0

## Links

- GitHub: https://github.com/golang/groupcache
- awesome-repositories: https://awesome-repositories.com/repository/golang-groupcache.md

## Description

Groupcache is a distributed caching library designed to coordinate data retrieval and storage across a cluster of nodes. It functions as a peer-to-peer data store that uses consistent hashing to assign specific keys to canonical owners, ensuring that cached items remain predictable and accessible throughout the network.

The system distinguishes itself through a request coalescing engine that merges concurrent requests for the same missing key into a single upstream fetch. This mechanism prevents redundant backend load by ensuring that only one process retrieves the required data while sharing the result with all waiting callers. Additionally, the library supports hot item replication, which duplicates frequently accessed data across multiple nodes to distribute read traffic and maintain consistent response times.

The architecture further provides logical namespace partitioning, allowing users to organize cached data into isolated buckets. This enables independent configuration and performance tracking for different types of content within the same distributed environment. Nodes communicate directly through a peer-to-peer protocol to exchange cached values, facilitating efficient resource usage and data synchronization across the cluster.

## Tags

### Data & Databases

- [Distributed Caching](https://awesome-repositories.com/f/data-databases/distributed-caching.md) — Provides a library for coordinating distributed data retrieval and caching across a cluster of nodes using consistent hashing.
- [Caching and Performance](https://awesome-repositories.com/f/data-databases/data-engineering-infrastructure/caching-performance.md) — Copies frequently accessed data across multiple nodes to prevent performance bottlenecks and ensure consistent response times. ([source](http://godoc.org/github.com/golang/groupcache))
- [Data Replication](https://awesome-repositories.com/f/data-databases/data-replication.md) — Duplicates frequently accessed data across multiple nodes to prevent performance bottlenecks and maintain fast response times.
- [High-Performance Data Infrastructures](https://awesome-repositories.com/f/data-databases/high-performance-data-infrastructures.md) — Caches frequently accessed items across multiple nodes to eliminate system bottlenecks and maintain fast response times.
- [Multi-Tenant Data Management](https://awesome-repositories.com/f/data-databases/multi-tenant-data-management.md) — Organizes related data into logical namespaces to apply unique configuration settings and track performance metrics for different application components.
- [Cache Namespaces](https://awesome-repositories.com/f/data-databases/schema-namespacing/cache-namespaces.md) — Organizes cached data into isolated buckets to allow independent configuration and performance tracking for different types of content.

### Software Engineering & Architecture

- [Consistent Hashing](https://awesome-repositories.com/f/software-engineering-architecture/distributed-systems/distributed-data-management/consistent-hashing.md) — Maps keys to specific cluster nodes using a ring-based algorithm to ensure stable data ownership and predictable lookups.

### Networking & Communication

- [Peer-to-Peer Networking](https://awesome-repositories.com/f/networking-communication/distributed-systems-p2p/peer-to-peer-networking.md) — Implements a distributed storage architecture that allows nodes to share cached values and replicate frequently accessed items across the network.
- [Peer-to-Peer Networking](https://awesome-repositories.com/f/networking-communication/peer-to-peer-networking.md) — Assigns cached items to specific nodes in a cluster using consistent hashing to ensure every key has a single canonical owner. ([source](http://godoc.org/github.com/golang/groupcache))
- [Peer-to-Peer File Sharing](https://awesome-repositories.com/f/networking-communication/distributed-systems-p2p/peer-to-peer-networking/peer-to-peer-file-sharing.md) — Enables nodes to exchange cached values directly to reduce latency and distribute read traffic across a distributed storage architecture.
- [Peer-to-Peer Data Exchange](https://awesome-repositories.com/f/networking-communication/peer-to-peer-data-exchange.md) — Exchanges data between cluster nodes using a lightweight protocol to allow direct retrieval of cached values from remote peers.

### Web Development

- [Request Dispatchers](https://awesome-repositories.com/f/web-development/backend-development/request-response-handling/http-request-handling/request-dispatchers.md) — Prevents redundant backend fetches by merging concurrent requests for the same data into a single operation.
- [Request Deduplication](https://awesome-repositories.com/f/web-development/request-deduplication.md) — Prevents redundant backend fetches by merging concurrent requests for the same data into a single operation.
- [Data Fetching](https://awesome-repositories.com/f/web-development/data-fetching-caching/data-fetching.md) — Coordinates simultaneous requests for identical data to ensure only one process retrieves the value while sharing the result with all waiting callers. ([source](http://godoc.org/github.com/golang/groupcache))