kaxil commented on a change in pull request #13798:
URL: https://github.com/apache/airflow/pull/13798#discussion_r567016431



##########
File path: airflow/upgrade/rules/spark_jdbc_operator_conn_id_rule.py
##########
@@ -0,0 +1,44 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+from airflow.models import Connection
+from airflow.upgrade.rules.base_rule import BaseRule
+from airflow.utils.db import provide_session
+
+
+class SparkJDBCOperatorConnIdRule(BaseRule):
+
+    title = "Check Spark JDBC Operator default connection name"
+
+    description = """\
+In Airflow 1.10.x, the default value for SparkJDBCOperator class 'conn_id' is 
'spark-default'.
+From Airflow 2.0, it has been changed to 'spark_default' to conform with the 
naming conventions
+of all other connection names.
+    """
+
+    @provide_session
+    def check(self, session=None):
+        for conn in session.query(Connection.conn_id):
+            if conn.conn_id == 'spark-default':
+                return (
+                    "Deprecation Warning: From Airflow 2.0, SparkJDBCOperator 
class 'conn_id' "
+                    "value has been changed to 'spark_default' to conform with 
the naming "
+                    "conventions of all other connection names."
+                    "Use 'spark_default' instead of 'spark-default'. See the 
link below for details: "
+                    "https://github.com/apache/airflow/blob/master/";
+                    "UPDATING.md#sparkjdbchook-default-connection"

Review comment:
       ```suggestion
                       "Deprecation Warning: From Airflow 2.0, the default 
value of 'conn_id' argument of SparkJDBCOperator class  "
                       "has been changed to 'spark_default' to conform with the 
naming "
                       "conventions of all other connection names."
                       "Please rename the connection with id 'spark-default' to 
'spark_default' or explicitly pass 'spark-default' to the operator. See the 
link below for details: "
                       "https://github.com/apache/airflow/blob/master/";
                       "UPDATING.md#sparkjdbchook-default-connection"
   ```
   
   I think this would be more clearer, what do you think?




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