nyoungstudios commented on PR #39772:
URL: https://github.com/apache/airflow/pull/39772#issuecomment-2599531232
This pr isn't working since merging in the main branch from when the main
branch was switched to Airflow 3.X.
This is the current error I am receiving in the scheduler:
```
--- Last chance exception handler ---
Traceback (most recent call last):
File
"/path/to/airflow/task_sdk/src/airflow/sdk/execution_time/supervisor.py", line
262, in _fork_main
target()
File "/path/to/airflow/airflow/dag_processing/processor.py", line 69, in
_parse_file_entrypoint
comms_decoder.send_request(log, result)
File
"/path/to/airflow/task_sdk/src/airflow/sdk/execution_time/task_runner.py", line
382, in send_request
encoded_msg = msg.model_dump_json().encode() + b"\n"
File
"/path/to/apache-airflow/lib/python3.10/site-packages/pydantic/main.py", line
477, in model_dump_json
return self.__pydantic_serializer__.to_json(
pydantic_core._pydantic_core.PydanticSerializationError: Unable to serialize
unknown type: <class 'airflow.models.xcom_arg.PlainXComArg'>
```
And this is the error in the UI:
(This example dag is the sample in the original pr description)
```
Broken DAG: [/path/to/airflow/dags/example_dag.py]
Traceback (most recent call last):
File "/path/to/airflow/airflow/serialization/serialized_objects.py", line
1615, in serialize_dag
serialized_dag["dag_dependencies"] = [x.__dict__ for x in
sorted(dag_deps)]
File "<string>", line 4, in __lt__
TypeError: '<' not supported between instances of 'str' and 'PlainXComArg'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/path/to/airflow/airflow/serialization/serialized_objects.py", line
1717, in to_dict
json_dict = {"__version": cls.SERIALIZER_VERSION, "dag":
cls.serialize_dag(var)}
File "/path/to/airflow/airflow/serialization/serialized_objects.py", line
1631, in serialize_dag
raise SerializationError(f"Failed to serialize DAG {dag.dag_id!r}: {e}")
airflow.exceptions.SerializationError: Failed to serialize DAG
'trigger_dag': '<' not supported between instances of 'str' and 'PlainXComArg'
```
I haven't been able to track down where this serialization problem is
occurring yet, but if anyone has any suggestions - that would be appreciated!
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