You do realize you have to query an index of all of that data for every single query your use makes right? Computing that index is not entirely trivial, nor is the operation of partitioning the data so it fits in ram across a pool of nodes.
Sure, role your own, but don’t act like making a highly scalable database is a weekend project.
Sure, role your own, but don’t act like making a highly scalable database is a weekend project.