70.Regions

对于表来说，Regions是可用和分配的基本元素，由每个列簇存储组成。结构如下：

Table                    (HBase table)
    Region               (Regions for the table)
        Store            (Store per ColumnFamily for each Region for the table)
            MemStore     (MemStore for each Store for each Region for the table)
            StoreFile    (StoreFiles for each Store for each Region for the table)
                Block    (Blocks within a StoreFile within a Store for each Region for the table)

从结构中可以发现：table是由regions构成的，而region是由store组成，每个store表示为每个列簇的存储。