thank you for the immediate reply. (Y)
On Wed, Apr 30, 2014 at 12:44 AM, Matteo Bertozzi <[email protected]>wrote: > HBase does not have the concept of "static" columns. > You just have "groups" the column families > and then each row has a set of qualifiers. > > so, you don't need to specify the set of columns (qualifiers) on > "initialization" > you just add/update rows with the specified column > > so you end up doing something like this pseudo code > > createTable(tableName, group1, group2); > table.put(row0, column0, value) > table.put(row1, column0, value) > > > Matteo > > > > On Tue, Apr 29, 2014 at 12:09 PM, Chamika Kasun <[email protected] > >wrote: > > > Yes this code is correct. Here what the code does is only create a column > > family. What i want to do is inside the column family i want to create > > several columns. In this documentation > > < > > > http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HTableDescriptor.html > > >for > > the "Class HTableDescripter" it says that addFamily(hcd); creates a > column > > family NOT A Column. > > > > *addFamily > > < > > > http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HTableDescriptor.html#addFamily(org.apache.hadoop.hbase.HColumnDescriptor) > > >* > > (HColumnDescriptor< > > > http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HColumnDescriptor.html > > > > > family) > > Adds a column family. > > > > In my project what i want to do is create several columns inside that > > column family. In Hbase Documentation it termed as "qualifier". That is i > > want to create several qualifiers inside a column family which can be > > created from the above code snippet. > > > > > > On Tue, Apr 29, 2014 at 11:49 PM, Ted Yu <[email protected]> wrote: > > > > > When create your table, you specify the column families in the table > > (code > > > snippet from TestFromClientSide3.java): > > > > > > HTableDescriptor htd = > > > newHTableDescriptor(hTable.getTableDescriptor()); > > > > > > HColumnDescriptor hcd = new > HColumnDescriptor(htd.getFamily(FAMILY)); > > > > > > htd.addFamily(hcd); > > > > > > admin.createTable(htd); > > > > > > When you insert data, you specify column along with data value. > > > > > > > > > Cheers > > > > > > > > > On Tue, Apr 29, 2014 at 11:08 AM, Chamika Kasun < > [email protected] > > > >wrote: > > > > > > > Hi all, > > > > > > > > Here what i want to do is i want to firstly need to create and a > column > > > > family and then need to create a column for data to be added later. > > Here > > > i > > > > can not use PUT command as it requires a value parameter(because idea > > of > > > > that application is first initiate the table and data will be added > > > later). > > > > Please help me out. I'm really new to hbase > > > > > > > > > > > > > > > -- > > Chamika Kasun. > > Undergraduate. > > Computer Science & Engineering > > University of Moratuwa. > > > -- Chamika Kasun. Undergraduate. Computer Science & Engineering University of Moratuwa.
