Hi, Thank you for the response, Ryan and Puri. I think I know what the column store basically is. And I also read through BigTable official paper and HBase architecture wiki. BigTable/Hbase seems different from C-Store and other column-oriented databases in conceptual data model, but I don't know how they differ in phisical data structure.
In the wiki page, (http://wiki.apache.org/hadoop/Hbase/HbaseArchitecture) there is a "Physical Storage View" section and you can see the top view, Row Key, Time Stamp and Column "contents:". In this example, the column "contents:" is sequetially stored like column-store sorted by compounded key (Row Key and Time Stamp) ? or How they(Row Key, Time Stamp, Column "contents:") are stored in disks ? I want to check the sources, but I need some knowledge about it so that it's easier to understand. Sorry for asking so many questions. Thanks, Hiro --- "Puri, Aseem" <[email protected]> wrote: > Hiro, > A column-oriented stores its content by column > rather than by > row. Ih HBase every column family has its own HStore > which further store > data on mapfiles on HDFS. > > Hope it helps!!! > > Aseem Puri > > > -----Original Message----- > From: Ryan Rawson [mailto:[email protected]] > Sent: Thursday, April 02, 2009 12:18 PM > To: [email protected] > Subject: Re: How is Hbase column oriented ? > > Hey, > > The hbase wiki has some good docs, you can start > with: > http://wiki.apache.org/hadoop/Hbase/HbaseArchitecture > > Also don't forget to read the bigtable paper: > http://labs.google.com/papers/bigtable.html > > Good luck! > > 2009/4/1 yamada hiroyuki <[email protected]> > > > Hello, > > > > I'm currently studying Hbase/BigTable . > > I kind of understand their conceptual data > structure, but > > I don't get how it's physically implemented, > especially > > how it's column oriented. > > I referenced BigTable paper and Hbase wiki, but > > none of them describe it. > > (it's just saying column oriented, I think.) > > > > Does anyone teach me how it's implemented ? > > (or you could guide me any pages describing it .) > > > > Thanks, > > Hiro > > >
