Hi Reply inline Regards Ram
> -----Original Message----- > From: Ramasubramanian [mailto:[email protected]] > Sent: Tuesday, September 18, 2012 1:46 PM > To: [email protected] > Subject: About hbase metadata > > Hi, > > 1. Where can I see the metadata of hbase? [Ram] What do you mean by metadata? You mean the tables present in the system and their regions. Yes, they can be seen. There are two catalog tables in HBase called ROOT and META. The ROOT has info where the META is and the META has info about the user tables and their regions. Scan '-META-' will help you see what is there in META. > 2. Can we able to edit it? [Ram] Generally -META- should not be edited by user. > 3. Can we specify column mapping for a table? [Ram] HBase is a Column based store. Here we have the concept of column families. All related columns can be grouped under a column. So every table schema has the table name and the list of column families. Columns under any col family can be dynamic and need not be specified explicitly. I think you can have a look at this http://hbase.apache.org/book.html#architecture. Also before all this, try reading the Google Bigtable paper. That is a nice place to start with. > > Regards, > Rams
