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Posts with the tag apache druid:

System Design Weekly 001: March 2021

Highlights Reddit: Scaling Reporting Reddit had an ad analytics system that aggregated data per ad ID and per day. This data was stored in Redis as a Thrift object. This works well if an advertiser wants to see analytics for a given day. However, looking up stats per range of dates means that application had to get every value for every date in the range of dates, deserialize Thrift dictionaries, which is also a CPU intensive operation.