title: Is Hbase a columnar DB
body: <p>Hbase table is based on a column family, this means that each column is a tuple
  Each column is stored together </p>
  
  <p>Does this means that HBase is not a columnar DB?
  Columnar DB are efficient in IO they can do better compression , since data of a single column tends to be similar.
  so it easier to compress one column at a time then to compress the entire table at once</p>
  
  <p>Does the fact that HBase column family is stored together, does it make it less efficient, or does HBase do some clever trick to maintain columnar nature ?</p>