At Spool, we calculate our key metrics in real time. Traditionally, metrics are performed by a batch job (running hourly, daily, etc.). Redis backed bitmaps allow us to perform such calculations in realtime and are extremely space efficient. In a simulation of 128 million users, a typical metric such as âdaily unique usersâ takes less than 50 ms on a MacBook Pro and only takes 16 MB of memory. Spo
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