"Also, what is the scale of Uber that you think is unsuitable for RDBMS" Never said it's unsuitable, I have no idea. Just said the move from relational to NoSQ

"Also, what is the scale of Uber that you think is unsuitable for RDBMS" Never said it's unsuitable, I have no idea. Just said the move from relational to NoSQL is what most billion dollar companies with mass-market apps or websites do. Many of them also do sharding on normal RDBMS.