什么场景下用Hbase
Hbase适用于存储不太复杂但数据很大的数据。列如商城系统中：用户，商品，订单，店铺，卖家，这些数据关系复杂不适合用Hbase。这里面订单数据量很大，而且要频繁拿出来计算，可以考虑只将订单这项存入Hbase。其他方面： 1，数据量达到上亿以上时可以使用Hbas
Hbase适用于存储不太复杂但数据很大的数据。列如商城系统中：用户，商品，订单，店铺，卖家，这些数据关系复杂不适合用Hbase。这里面订单数据量很大，而且要频繁拿出来计算，可以考虑只将订单这项存入Hbase。其他方面：
1，数据量达到上亿以上时可以使用Hbase如果只有上千或上百万行，则用传统的RDBMS。
2，不依赖所有RDBMS的额外特性(列数据类型, 第二索引, 事物,高级查询语言等.)
3， 一个建立在RDBMS上应用，需要考虑在Hbase上重新构建。
4， 要想Hbase起到比RDBMS还好的性能和充分的利用，Hbase必须在5个节点以上
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