Vitess

Semi-sync replication enables you to prevent your master from finishing replication until a replica confirms that it has received all the changes. Thus addi...

Semi-sync replication ensures higher levels of durability between the master and at least one replica. You can read more about semi-sync replication here.

VReplication is very fast, typically replication lag is below a second as long as your network is good.  However, if there is a network partition, thing...