Reddit was using Cassandra in 2010 (https://www.reddit.com/r/programming/comments/bcqhi/reddits_now_running_on_cassandra/ https://www.reddit.com/r/programming/c

Reddit was using Cassandra in 2010 (https://www.reddit.com/r/programming/comments/bcqhi/reddits_now_running_on_cassandra/ https://www.reddit.com/r/programming/comments/bcqhi/reddits_...). The experience was mentioned on HN at https://news.ycombinator.com/item?id=21694461 https://news.ycombinator.com/item?id=21694461. I expect that they started with an RDBMS and made various moves over the years.