what about keeping a record per device and recording there that you've seen it, and only incrementing the counters (or a different set of counters) based on that?
On Wed, Nov 9, 2011 at 6:09 PM, Philippe <watche...@gmail.com> wrote: > Hello, I'd like to get some ideas on how to model counting uniques with > cassandra. > My use-case is that I have various counters that I increment based on data > received from multiple devices. I'd like to be able to know if at least X > unique devices contributed to a counter value. > I've thought of the idea of building a key per counter and then using > columns whose name would be the device ids but it might grow very very > large and I don't see how to prune it effeciently. > Any ideas ? > > Thanks >
