FWIW, these solutions rarely bypass MySQL entirely or at all. Although there are ways to access InnoDB without making SQL queries (Memcached API; Handler Socket), the MySQL server is still involved. It just skips the normal protocol, auth, SQL parsing, etc.
Even then, there aren't a lot of published cases of people using these alternative access methods at scale yet. AFAIK, all of the large kv use-cases you've mentioned still go through traditional SQL queries. Despite the overhead of SQL parsing, it provides more control and visibility. The ecosystem around alternative access methods isn't nearly as mature.
Even then, there aren't a lot of published cases of people using these alternative access methods at scale yet. AFAIK, all of the large kv use-cases you've mentioned still go through traditional SQL queries. Despite the overhead of SQL parsing, it provides more control and visibility. The ecosystem around alternative access methods isn't nearly as mature.