可搜索的分布式Key-Value存储 HyperDex
HyperDex是一个分布式，可搜索的Key-value存储。它具有以下特性：
Fast HyperDex has lower latency and higher throughput than most other key-value stores.
Searchable HyperDex enables lookups of non-primary data attributes. Such searches are implemented efficiently and contact a small number of servers.
Scalable HyperDex scales as more machines are added to the system.
Consistent The value you GET is always the latest value you PUT. Not just "eventually," but immediately and always.
Fault tolerant HyperDex handles failures. Data is automatically replicated on multiple machines so that failures do not cause data loss.
1.分布式KV store，系统性能能够随节点数目线性扩展
2. 吞吐和延时都能秒杀现在风头正劲的MonogDB，吞吐甚至强于Redis
3.使用了hyperspace hashing技术，使得对存储的K-V的任意属性进行查询成为可能
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