Cassandra是一款分布式NoSQL数据库系统，被Digg、Facebook等公司用于处理大规模活跃数据集。它具有故障容忍性，能够自动复制数据到多个节点，并支持跨数据中心复制。Cassandra采用去中心化设计，所有节点地位相同，没有单点故障。此外，用户可以根据需求选择同步或异步复制，且系统具备线性扩展能力。
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NoSQL数据库探讨之一 － 为什么要用非关系数据库？
Cassandra NoSQL 数据库升级为Apache顶级项目
Cassandra入门
Wide variety of languages
You can code your application in Java, python, php, scala, perl, ruby, scala, c++, c#/.net and more
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Proven
Cassandra is in use at Digg, Facebook,Twitter, Reddit, Rackspace, Cloudkick, Cisco, SimpleGeo, Ooyala, OpenX, and more companies that have large, active data sets. The largest production cluster has over 100 TB of data in over 150 machines.
Fault Tolerant
Data is automatically replicated to multiple nodes for fault-tolerance. Replication across multiple data centers is supported. Failed nodes can be replaced with no downtime.
Decentralized
Every node in the cluster is identical. There are no network bottlenecks. There are no single points of failure.
You're in control
Choose between synchronous or asynchronous replication for each update. Highly available asynchronus operations are optimized with features like Hinted Handoffand Read Repair.
Rich Data Model
Allows efficient use for many applications beyond simple key/value.
Elastic
Read and write throughput both increase linearly as new machines are added, with no downtime or interruption to applications.
Durable
Cassandra is suitable for applications that can't afford to lose data, even when an entire data center goes down.
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