With raw thrift APIs:
1. Fetch column from supercolumn:
ColumnPath cp = new ColumnPath("ColumnFamily");
cp.setSuper_column("SuperColumnName");
cp.setColumn("ColumnName");
ColumnOrSuperColumn resp = client.get(getByteBuffer("RowKey"), cp,
ConsistencyLevel.ONE);
Column c = resp.getColumn();
2. Add a new supercolumn:
SuperColumn superColumn = new SuperColumn();
superColumn.setName(getBytes("SuperColumnName"));
cols = new ArrayList<Column>();
Column c = new Column();
c.setName(name);
c.setValue(value);
c.setTimestamp(timeStamp);
cols.add(c);
//repeat above 5 lines for as many cols you want in supercolumn
superColumn.setColumns(cols);
List<Mutation> mutations = new ArrayList<Mutation>();
ColumnOrSuperColumn csc = new ColumnOrSuperColumn();
csc.setSuper_column(superColumn);
csc.setSuper_columnIsSet(true);
Mutation m = new Mutation();
m.setColumn_or_supercolumn(csc);
m.setColumn_or_supercolumnIsSet(true);
mutations.add(m);
Map<String, List<Mutation>> allMutations = new HashMap<String,
List<Mutation>>();
allMutations.put("ColumnFamilyName", mutations);
Map<ByteBuffer, Map<String, List<Mutation>>> mutationMap = new
HashMap<ByteBuffer, Map<String, List<Mutation>>>();
mutationMap.put(getByteBuffer("RowKey"), mutations);
client.batch_mutate(mutationMap, ConsistencyLevel.ONE);
HTH!
Thanks,
Naren
On Thu, Jan 6, 2011 at 10:42 PM, Arijit Mukherjee <ariji...@gmail.com>wrote:
> Thank you. And is it similar if I want to search a subcolumn within a
> given supercolumn? I mean I have the supercolumn key and the subcolumn
> key - can I fetch the particular subcolumn?
>
> Can you share a small piece of example code for both?
>
> I'm still new into this and trying to figure out the Thrift APIs. I
> attempted to use Hector, but got myself into more confusion.
>
> Arijit
>
> On 7 January 2011 11:44, Roshan Dawrani <roshandawr...@gmail.com> wrote:
> >
> > On Fri, Jan 7, 2011 at 11:39 AM, Arijit Mukherjee <ariji...@gmail.com>
> wrote:
> >>
> >> Hi
> >>
> >> I've a quick question about supercolumns.
> >> EventRecord = {
> >> eventKey2: {
> >> e2-ts1: {set of columns},
> >> e2-ts2: {set of columns},
> >> ...
> >> e2-tsn: {set of columns}
> >> }
> >> ....
> >> }
> >>
> >> If I want to append another "e2-tsp: {set of columns}" to the event
> >> record keyed by eventKey2, do I need to retrieve the entire eventKey2
> >> map, and then append this new row and re-insert eventKey2?
> >
> > No, you can simply insert a new super column with its sub-columns with
> the rowKey that you want, and it will join the other super columns of that
> row.
> >
> > A row have billions of super columns. Imagine fetching them all, just to
> add one more super column into it.
> >
> >
> >
> >
> >
>
>
> --
> "And when the night is cloudy,
> There is still a light that shines on me,
> Shine on until tomorrow, let it be."
>
