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From kevin <kevincastigli...@gmail.com>
Subject Re: are columns of a supercolumn name sorted?
Date Mon, 26 Oct 2009 01:26:59 GMT
hi jonathan
thanks for the clarification.

>>>subcolumns is what you want (with the reverse option to slice, to get
most-recent-first).

is reverse an option in get_slice method or in my python code or in the
config file?



On Sun, Oct 25, 2009 at 5:40 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> Sorry, the paragraph about subcolumns always being sorted by time is
> outdated.  (I've taken it out on the 0.4 branch now -- it was already
> gone in trunk.)  Read just below that about how comparewith and
> comparesubcolumnswith work.  Sounds like using TimeUUIDType for
> subcolumns is what you want (with the reverse option to slice, to get
> most-recent-first).
>
> On Sun, Oct 25, 2009 at 5:17 PM, kevin <kevincastiglione@gmail.com> wrote:
> > i am inserting three columns x,a,z into a super column named 'sc_2'. the
> > config file says that the columns of a super column are timesorted, but
> when
> > i get_slice it is sorted by the name of the columns. how do i get it time
> > sorted so that i get the most recently inserted/updated column first?
> > cassandra version apache-cassandra-incubating-0.4.1-bin.tar.gz, and
> lazyboy
> > latest git clone.
> > thanks
> >
> >
> >>>> import lazyboy,time, pprint
> >>>> from cassandra import Cassandra
> >>>> from cassandra.ttypes import *
> >
> >
> >>>> client=lazyboy.connection.Client(['localhost:9160'])
> >>>> keyspace = "Keyspace1"
> >>>> key='mykeyx'
> >>>> column_path =
> >>>> ColumnPath(column_family="Super1",column="x",super_column='sc_2')
> >>>> client.insert(keyspace, key, column_path, 'a', time.time(),
> >>>> ConsistencyLevel.ONE);
> >>>> column_path =
> >>>> ColumnPath(column_family="Super1",column="a",super_column='sc_2')
> >>>> client.insert(keyspace, key, column_path, 'a', time.time(),
> >>>> ConsistencyLevel.ONE);
> >>>> column_path =
> >>>> ColumnPath(column_family="Super1",column="z",super_column='sc_2')
> >>>> client.insert(keyspace, key, column_path, 'a', time.time(),
> >>>> ConsistencyLevel.ONE);
> >
> >
> >>>> slice_range = SliceRange(start="", finish="")
> >>>> predicate = SlicePredicate(slice_range=slice_range)
> >>>> column_parent = ColumnParent(column_family="Super1")
> >>>> client.get_slice(keyspace, key, column_parent, predicate,
> >>>> ConsistencyLevel.ONE)
> > [ColumnOrSuperColumn(column=None, super_column=SuperColumn(name='sc_2',
> > columns=[Column(timestamp=1256512261, name='a', value='a'),
> > Column(timestamp=1256512252, name='x', value='a'),
> > Column(timestamp=1256512267, name='z', value='a')]))]
> >
>

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