You're right. I think in general the quorum commit in Postgres is a bit lower level, in the sense that it is less opinionated and allows you to configure the qu

You're right. I think in general the quorum commit in Postgres is a bit lower level, in the sense that it is less opinionated and allows you to configure the quorum (essentially enabling both semisync and synchronous). Also, as sibling points out, semisync in MySQL seems to commit on the master first no matter what, while in PG quorum commit, no one commits until the required acks are received.