http://nosql.mypopescu.com/post/3220921756/hbase-internals-hfile-explained might help.
Viv On Tue, Mar 22, 2011 at 11:43 AM, Weishung Chung <[email protected]> wrote: > My fellow superb hbase experts, > > Looking at the HFile specs and have some questions. > How is a particular table cell in a HBase table being represented in the > HFile? Does the key of the key value pair represent the rowkey+column > family:qualifier+timestamp and the value represent the corresponding cell > value? If so, to read a row, multiple key/value pair reads have to be done? > > Thank you :) > > > On Tue, Mar 22, 2011 at 9:09 AM, Weishung Chung <[email protected]> > wrote: > > > Thank you, I will definitely take a look. Also, the TFile spec below > helps > > me to understand more, > > what an exciting work ! > > > > > > > https://issues.apache.org/jira/secure/attachment/12396286/TFile+Specification+20081217.pdf > > > > < > https://issues.apache.org/jira/secure/attachment/12396286/TFile+Specification+20081217.pdf > > > > On Mon, Mar 21, 2011 at 11:41 AM, Doug Cutting <[email protected]> > wrote: > > > >> On 03/19/2011 09:01 AM, Weishung Chung wrote: > >> > I am browsing through the hadoop.io package and was wondering what > >> other > >> > file formats are available in hadoop other than SequenceFile and > TFile? > >> > Is all data written through hadoop including those from hbase saved in > >> the > >> > above formats? It seems like SequenceFile is in key value pair format. > >> > >> Avro includes a file format that works with Hadoop. > >> > >> > >> > http://avro.apache.org/docs/current/api/java/org/apache/avro/mapred/package-summary.html > >> > >> Doug > >> > > > > >
