HBase学习笔记

1.HBase介绍

Apache HBase™ is the Hadoop database, a distributed, scalable, big data store.

Use Apache HBase™ when you need random, realtime read/write access to your Big Data. This project's goal is the hosting of very large tables -- billions of rows X millions of columns -- atop clusters of commodity hardware. Apache HBase is an open-source, distributed, versioned, non-relational database modeled after Google's Bigtable: A Distributed Storage System for Structured Data by Chang et al. Just as Bigtable leverages the distributed data storage provided by the Google File System, Apache HBase provides Bigtable-like capabilities on top of Hadoop and HDFS.

 

2.HBase表结构

建表时，不需要限定表中的字段，只需要指定若干个列族

插入数据时，列族中可以存储任意多个列（Key-Value）

要查询某一字段时，需要指定坐标：表名-->行键-->列族(column family)：列名(qualifier)-->版本

3.HBase的数据存储

一个表table_1可以分成若干Region