setReversed(true) sorts timeUUID in descending order. thanks, -aj
On Sun, May 9, 2010 at 6:44 AM, Lee Parker <l...@socialagency.com> wrote:
> You need to set the Reversed attribute on the sliceRange. I don't know
> which library you are using, but it may be something like
> sliceRange.setReversed(true).
>
> Lee Parker
> On Sat, May 8, 2010 at 7:36 PM, AJ Chen <ajc...@web2express.org> wrote:
>
>> I have a column family for sorting time-uuid and expect to retrieve
>> columns in descending order (i.e. latest on the top). but the following
>> get_slice call returns column in ascending order. Does cassandra sort
>> time-uuid column in descending order by default? Should get_slice call
>> return the most recent time-uuid?
>>
>> <ColumnFamily CompareWith="TimeUUIDType" Name="Index"/>
>>
>> ColumnParent columnParent = new ColumnParent(cf);
>> SlicePredicate predicate = new SlicePredicate();
>> SliceRange sliceRange = new SliceRange();
>> sliceRange.setStart(new byte[] {});
>> sliceRange.setFinish(new byte[] {});
>> sliceRange.setCount(max);
>> predicate.setSlice_range(sliceRange);
>> return client.get_slice(keyspace, key, columnParent, predicate,
>> ConsistencyLevel.ONE);
>>
>> thanks,
>> -aj--
>>
>>
>
--
AJ Chen, PhD
Chair, Semantic Web SIG, sdforum.org
http://web2express.org
twitter @web2express
Palo Alto, CA, USA
