You can do it, the problems start coming when you then try to automatically go back to the failed master. PostgreSQL 9.6 makes this easier, and we should see so

You can do it, the problems start coming when you then try to automatically go back to the failed master. PostgreSQL 9.6 makes this easier, and we should see some more automated tooling around it - but in general I have learned that unless you are using shared storage automatic fail-over clusters can be hairy and generally avoided.