hunnguye commented on code in PR #71949:
URL: https://github.com/apache/airflow/pull/71949#discussion_r3915892050


##########
providers/apache/spark/src/airflow/providers/apache/spark/hooks/spark_submit.py:
##########
@@ -457,6 +458,16 @@ def _resolve_connection(self) -> dict[str, Any]:
                     conn_data["keytab"] = 
self._create_keytab_path_from_base64_keytab(
                         base64_keytab, conn_data["principal"]
                     )
+            # Construct the Standalone Restendpoint
+            if (
+                conn.conn_type == "spark"
+                and conn_data["master"].startswith("spark://")
+                and conn_data["deploy_mode"] == "cluster"
+            ):
+                host = conn_data["master"].replace("spark://", "").strip()
+                conn_data["rest_endpoint"] = (
+                    
f"{conn_data['rest_scheme']}://{host.split(':')[0]}:{conn_data['rest_port']}"

Review Comment:
   Ok no problem.
   In that case i would, explicitely only create the rest_endpoint attribute, 
if there is just one elment in a comma separated list. That way we can pass the 
test, preserve and stay consistent with the current assumption of the master 
endpoint while still leave room for later adjustments and refactoring for multi 
master endpoints



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