Update max_consecutive_failed_dag_runs default value to zero in TaskSDK dag (#49795)

* Update max_consecutive_failed_dag_runs default value to zero in TaskSDK dag

* Update max_consecutive_failed_dag_runs default value to zero in TaskSDK dag

Author: gopidesupavan

airflow-core/src/airflow/models/dag.py

@@ -2046,16 +2046,7 @@ def from_sdk_dag(cls, dag: TaskSDKDag) -> DAG:
             if not field.init or field.name in ["edge_info"]:
                 continue
 
-            value = getattr(dag, field.name)
-
-            # Handle special cases where values need conversion
-            if field.name == "max_consecutive_failed_dag_runs":
-                # SchedulerDAG requires this to be >= 0, while TaskSDKDag allows -1
-                if value == -1:
-                    # If it is -1, we get the default value from the DAG
-                    continue
-
-            kwargs[field.name] = value
+            kwargs[field.name] = getattr(dag, field.name)
 
         new_dag = cls(**kwargs)
 

airflow-core/tests/unit/serialization/test_dag_serialization.py

@@ -686,10 +686,6 @@ def validate_deserialized_dag(self, serialized_dag: DAG, dag: DAG):
             actual = getattr(serialized_dag, field)
             expected = getattr(dag, field, None)
 
-            if field == "max_consecutive_failed_dag_runs":
-                # TaskSDK sets -1 default to max_consecutive_failed_dag_runs
-                assert actual in [expected, 0], f"{dag.dag_id}.{field} does not match"
-                continue
             assert actual == expected, f"{dag.dag_id}.{field} does not match"
         # _processor_dags_folder is only populated at serialization time
         # it's only used when relying on serialized dag to determine a dag's relative path

task-sdk/src/airflow/sdk/definitions/dag.py

@@ -399,9 +399,7 @@ def __rich_repr__(self):
     user_defined_filters: dict | None = None
     max_active_tasks: int = attrs.field(default=16, validator=attrs.validators.instance_of(int))
     max_active_runs: int = attrs.field(default=16, validator=attrs.validators.instance_of(int))
-    max_consecutive_failed_dag_runs: int = attrs.field(
-        default=-1, validator=attrs.validators.instance_of(int)
-    )
+    max_consecutive_failed_dag_runs: int = attrs.field(default=0, validator=attrs.validators.instance_of(int))
     dagrun_timeout: timedelta | None = attrs.field(
         default=None,
         validator=attrs.validators.optional(attrs.validators.instance_of(timedelta)),