Thanks for all the answers, they definitely helped. Just out of curiosity, is there any underlying architectural reason why it's not possible to order a row based on its counters values? or is it something that might be in the roadmap in the future?
-- Filippo Diotalevi On Tuesday, 22 May 2012 at 08:48, Romain HARDOUIN wrote: > > I mean iterate over each column -- more precisly: *bunches of columns* using > slices -- and write new columns in the inversed index. > Tamar's data model is made for real time analysis. It's maybe overdesigned > for a daily ranking. > I agree with Samal, you should split your data across the space of tokens. > Only CF Ranking feeding would be affected, not the "top N" queries. > > Filippo Diotalevi <fili...@ntoklo.com (mailto:fili...@ntoklo.com)> a écrit > sur 21/05/2012 19:05:28 : > > > Hi Romain, > > thanks for your suggestion. > > > > When you say " build every day a ranking in a dedicated CF by > > iterating over events:" do you mean > > - load all the columns for the specified row key > > - iterate over each column, and write a new column in the inversed index > > ? > > > > That's my current approach, but since I have many of these wide rows > > (1 per day), the process is extremely slow as it involves moving an > > entire row from Cassandra to client, inverting every column, and > > sending the data back to create the inversed index.
