Re: Column Family row keys
On Tue, Oct 18, 2011 at 4:30 PM, Jonathan Ellis wrote: > On Tue, Oct 18, 2011 at 4:10 PM, Tyler Hobbs wrote: > > * You'll get range ghosts > > (http://wiki.apache.org/cassandra/FAQ#range_ghosts) with column_count=0. > > You can avoid them if you set column_count=1. > > What heuristic do you use for skipping empty rows? > In get_range(), if key_slice.columns is empty and column_count != 0, skip the row. It also has the effect (both good and bad) of skipping rows when column_count > 0 and there's a normal column slice, but the slice is empty.
Re: Column Family row keys
On Tue, Oct 18, 2011 at 4:10 PM, Tyler Hobbs wrote: > * You'll get range ghosts > (http://wiki.apache.org/cassandra/FAQ#range_ghosts) with column_count=0. > You can avoid them if you set column_count=1. What heuristic do you use for skipping empty rows? -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
Re: Column Family row keys
A couple of notes: * You need to use the master branch (not the most recent release) if you want to use get_range() with column_count=0 and get any results. * You'll get range ghosts ( http://wiki.apache.org/cassandra/FAQ#range_ghosts) with column_count=0. You can avoid them if you set column_count=1. - Tyler On Tue, Oct 18, 2011 at 3:58 PM, aaron morton wrote: > There no first class support for just getting row keys, you will always > want to get a column. > > You can fake it by requesting zero columns. > > Cheers > > - > Aaron Morton > Freelance Developer > @aaronmorton > http://www.thelastpickle.com > > On 19/10/2011, at 3:53 AM, David Fischer(Gtalk) wrote: > > Hello all. > New to cassandra and I am using pycassa to access data. I was > wondering someone knows how to just pull row keys insead of get_range? > This question may be a bit more on the pycassa but not sure. If > someone has a java snippet to do it that would be ok also > > Thanks > > >
Re: Column Family row keys
There no first class support for just getting row keys, you will always want to get a column. You can fake it by requesting zero columns. Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 19/10/2011, at 3:53 AM, David Fischer(Gtalk) wrote: > Hello all. > New to cassandra and I am using pycassa to access data. I was > wondering someone knows how to just pull row keys insead of get_range? > This question may be a bit more on the pycassa but not sure. If > someone has a java snippet to do it that would be ok also > > Thanks
Column Family row keys
Hello all. New to cassandra and I am using pycassa to access data. I was wondering someone knows how to just pull row keys insead of get_range? This question may be a bit more on the pycassa but not sure. If someone has a java snippet to do it that would be ok also Thanks
