Hbase 介绍，
Hbase
hadoop数据库，分布式可伸缩大型数据存储。
用户对随机、实时读写数据。
十亿行 x 百万列。
版本化、非关系型数据库。
Feature
Linear and modular scalability. //线性模块化扩展方式。
Strictly consistent reads and writes. //严格一致性读写
Automatic and configurable sharding of tables //自动可配置表切割
Automatic failover support between RegionServers. //区域服务器之间自动容在
Convenient base classes for backing Hadoop MapReduce jobs with Apache HBase tables. //
Easy to use Java API for client access. //java API
Block cache and Bloom Filters for real-time queries //块缓存和布隆过滤器用于实时查询
Query predicate push down via server side Filters //通过服务器端过滤器实现查询预测
Thrift gateway and a REST-ful Web service that supports XML, Protobuf, and binary data encoding options //
Extensible jruby-based (JIRB) shell //
Support for exporting metrics via the Hadoop metrics subsystem to files or Ganglia; or via JMX //可视化
面向列数据库。
hbase存储机制
面向列存储，table是按row排序。