[monstrado]

Turns out we are doing a shuffle :) - We're using Apache Flink for the aggregation step (5 second window) which performs a merge on key before writing the value out. So at the end of the day, we would only read/deserialize/merge/write once every 5 seconds, that is of course assuming we received data for the HLL aggregation.

However, due to the need for HA, we might run two or three clusters in different AZs which means we might have a few servers writing a partial aggregation to the same row, thus, the awesomeness of FDB plays a role.

That being said, our P99 latency writing to FDB is typically very low (few ms). We're doing usually 4,000 - 5,000 transactions a second at any given time.