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Why not TiDB ?

FYI: TiDB is relevant because it is distributed and protocol-compatible with MySQL.

I think at this point it's basically a non-option though. Ti is nowhere near mature enough, the ops investment cost is extremely nontrivial, and it and still has some interesting issues to work out (e.g. [1]).

Furthermore, protocol-compatible doesn't directly imply API-compatible (I'm thinking of very very subtle differences between things like datatypes or isolation level behavior). I know a bit more about CockroachDB, which consciously does some things differently from Postgres.

[1] https://github.com/pingcap/tidb/issues/2712

It's not a drop-in, but several very large websites migrated from MySQL to TiDB, so it definitely is an option.

Source? I'm guessing you're referring to Mobike and Yiguo... any others?

https://www.pingcap.com/cases/

Those two are just case studis. There is a fuller list here: https://pingcap.com/docs/adopters/

TiDB developer here. There are more than one hundred companies who use TiDB in their production environment. The number keeps growing. The link in sanxiyn's post shows part of them. I think it is safe to say that TiDB is mature enough.

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