Not that I'm aware of. There are several other decent alternatives to large amounts of subcolumns in a supercolumn, so I don't think it's a high priority.
- Tyler On Fri, Jan 7, 2011 at 9:59 PM, Rajkumar Gupta <rajkumar....@gmail.com>wrote: > Hey Tyler, > > Is this limitation of supercolumns going to be removed anytime sooner ? > > Raj > > On Fri, Jan 7, 2011 at 8:51 PM, Tyler Hobbs <ty...@riptano.com> wrote: > > An important bit to read about supercolumn limitations: > > http://www.riptano.com/docs/0.6/data_model/supercolumns#limitations > > > > Don't make supercolumns with a huge number of subcolumns (or a few really > > large subcolumns) unless you plan to always read all of them at once. > > > > - Tyler > > > > On Fri, Jan 7, 2011 at 1:27 AM, Arijit Mukherjee <ariji...@gmail.com> > wrote: > >> > >> Thanx to both of you. I can now go ahead a bit more. > >> > >> Arijit > >> > >> On 7 January 2011 12:53, Narendra Sharma <narendra.sha...@gmail.com> > >> wrote: > >> > 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." > >> > > >> > > >> > >> > >> > >> -- > >> "And when the night is cloudy, > >> There is still a light that shines on me, > >> Shine on until tomorrow, let it be." > > > > >
