本文深入探讨了HRegionServer如何打开区域并创建相应的HRegion对象，阐述了每个表由用户预先定义的HColumnFamily如何对应到Store实例，并详细解释了Store实例与StoreFile、MemStore的关系及作用。
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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