Depending on what accuracy is needed, hyperloglogs can be an interesting alternative https://en.m.wikipedia.org/wiki/HyperLogLog
> Am 09.06.2019 um 15:59 schrieb big data <bigdatab...@outlook.com>: > > From m opinion, Bitmap is the best solution for active users calculation. > Other solution almost bases on count(distinct) calculation process, which is > more slower. > > If you 've implemented Bitmap solution including how to build Bitmap, how to > load Bitmap, then Bitmap is the best choice. > >> 在 2019/6/5 下午6:49, Rishi Shah 写道: >> Hi All, >> >> Is there a best practice around calculating daily, weekly, monthly, >> quarterly, yearly active users? >> >> One approach is to create a window of daily bitmap and aggregate it based on >> period later. However I was wondering if anyone has a better approach to >> tackling this problem.. >> >> -- >> Regards, >> >> Rishi Shah
