hbase region, store, storefile和列簇，的关系
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The HRegionServer opens the region and creates a corresponding HRegion object. When
the HRegion is opened it sets up a Store instance for each HColumnFamily for every table
as defined by the user beforehand. Each Store instance can, in turn, have one or more
StoreFile instances, which are lightweight wrappers around the actual storage file
called HFile. A Store also has a MemStore, and the HRegionServer a shared HLog in-stance。
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hbase table中每个列簇都对应着region中的一个store，在hdfs系统中则对应着一个目录，如果列簇中尚无数据，怎该目录为空，也就是该store下还没有storefile。
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1.house_hire_analysis 表中列簇total下无数据，另一张表fangyuan下有数据：
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2.查看hdfs region下的内容
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3. hbase console 如图：
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4.put一条记录到house_hire_analysis中，并flush，flush将改动从memstore刷新到磁盘
5. hbase cosole storefile已经增加
6.新flush的kv根据策略会分别存到不同的storefiles中(最后compaction 会将这些小文件合并)
