Wild ass guess based on a large use case I knew about at the time If you go above that, I expect it’d largely be fine as long as you were sure they weren’t overlapping so reads only ever touched a small subset of the windows (ideally 1).
If you have one day windows and every read touches all of the windows, you’re going to have a bad time. -- Jeff Jirsa > On Feb 11, 2019, at 12:12 PM, DuyHai Doan <doanduy...@gmail.com> wrote: > > Hello users > > On the official documentation for TWCS > (http://cassandra.apache.org/doc/latest/operating/compaction.html#time-window-compactionstrategy) > it is advised to select the windows unit and size so that the total number > of windows intervals is around 20-30. > > Is there any explanation for this range of 20-30 ? What if we exceed this > range, let's say having 1 day windows and keeping data for 1year, thus having > indeed 356 intervals ? What can go wrong with this ? > > Regards > > Duy Hai DOAN
