分类目录键值数据库

What is KeyDB?

KeyDB is an in-memory, high performance database with support for numerous data types, on-disk persistence and high availability. Compatible with Redis™ API and protocols, KeyDB is a drop-in replacement for your existing Redis™ deployments with numerous enhancements, higher performance, and lower Total Cost of Ownership (TCO).

Designed for use as both a cache as well as use as a primary database, KeyDB is a fast and versatile NOSQL database useful in many applications. Its low resource requirements and high-speed mean fewer instances to manage and much lower costs. KeyDB looks to fully utilize the hardware provided to your instances enabling a higher throughput and efficiency.

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随着CoreOS和Kubernetes等项目在开源社区日益火热，它们项目中都用到的etcd组件作为一个高可用强一致性的服务发现存储仓库，渐渐为开发人员所关注。在云计算时代，如何让服务快速透明地接入到计算集群中，如何让共享配置信息快速被集群中的所有机器发现，更为重要的是，如何构建这样一套高可用、安全、易于部署以及响应快速的服务集群，已经成为了迫切需要解决的问题。etcd为解决这类问题带来了福音，本文将从etcd的应用场景开始，深入解读etcd的实现方式，以供开发者们更为充分地享用etcd所带来的便利。

经典应用场景

要问etcd是什么？很多人第一反应可能是一个键值存储仓库，却没有重视官方定义的后半句，用于配置共享和服务发现。

A highly-available key value store for shared configuration and service discovery.

实际上，etcd作为一个受到ZooKeeper与doozer启发而催生的项目，除了拥有与之类似的功能外，更专注于以下四点。

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