sql.connect wrongly reports a timeout when attempting to connect to a non-existing warehouse

Commencez par sql.connect et par le chemin de retry de ThriftBackend décrit dans l’issue, puis reproduisez la tentative de connexion avec un warehouse_id inexistant. Suivez la façon dont des réponses 404 répétées deviennent une MaxRetryError et identifiez la limite d’exception existante. La tâche est terminée lorsque les warehouses inexistants ou supprimés peuvent être distingués des timeouts sans analyser le texte de l’exception, tout en conservant le comportement normal de retry.

Disclaimer: I am a Databricks employee.

Calling databricks.sql.connect with a non-existing warehouse_id will raise a generic time-out exception, coming from the ThriftBackend.

It's only by digging in the source code that one can find the default of 30(!) retries - which can be set by including _retry_stop_after_attempts_count in sql.connect.

As a user of SQL Client, I'd like to easily make a distinction between a timeout (=unknown circumstances, makes more sense to retry) and a non-existing/deleted warehouse (=hard fact, makes no sense to keep trying to connect).

connection = sql.connect(
            server_hostname=server_hostname,
            http_path=f"""/sql/1.0/warehouses/{warehouse_id}""",
            credentials_provider=_credentials_provider
        )

Exception:

  
  HTTPSConnectionPool(host='[xxxx.databricks.com](http://xxxx.cloud.databricks.com/)', port=443):   
  Max retries exceeded with url: /sql/1.0/warehouses/786786d78562786  
  (Caused by ResponseError('too many 404 error responses')).

Alternatives considered

1. One can add another dependency to the SDK and check if the Warehouse exists. It seems overkill to add the SDK just for that purpose. It really should be part of the connect client.
2. One can parse the exception text and apply some heuristics to form an educated guess with the 404 reply. This is hacky and might have too many edge-cases. E.g. calling /sql/1.0/**warehoses**/xxxxxwould raise the exact same exception.