I'm running a Google Cloud SQL instance ("mysql-master") and it has one replica. ("mysql-replica") Web apps on another servers read and write data on the Cloud SQL instance.
While mysql-master is restarting, can app servers read and write data?
I want to run
gcloud sql instances patch mysql-master, but it sometimes requires the instance to restart.
I wonder if web apps can read/write data on the instance while it is restarting.