According to the article, the interviewee used to work at DataStax (leader in Cassandra) before joining Instagram. I guess this is one of the reason why they f

According to the article, the interviewee used to work at DataStax (leader in Cassandra) before joining Instagram. I guess this is one of the reason why they first considered Cassandra and it turned out to be very successful. Biased or not, it is always good to have an engineer with deep understanding on the database, rather than just being an ordinary user.