requests.exceptions.ConnectionError: HTTPConnectionPool(host='pinot2-controller-external.data2.svc', port=9000): Max retries exceeded with url: /tables/requests2/schema (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x105fc4280>: Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known'))

Seems like controller is down?