Scaling Reporting at Reddit

redditblog.com

Pretty cool: the Reddit team replaced a pure-caching based approach to advertising performance data serving (very inflexible) to a Druid-based OLAP system that could both perform like a cache for pre-aggregations as well as handle analytical queries.

This was interesting for me as I had a conversation last week where "eliminating legacy caching systems" was flagged to me as the next big data pipeline problem to solve. It's not a problem I've personally dealt with but totally understand why this is such a big pain point and why products like Druid and Materialize will be critical here.

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