[GitHub] [airflow] MatrixManAtYrService commented on issue #15698: task_instance_mutation_hook not called by scheduler when importing airflow.models.taskinstance

[GitBox <gi...@apache.org>]

MatrixManAtYrService commented on issue #15698:
URL: https://github.com/apache/airflow/issues/15698#issuecomment-842810436


   If I do:
   
   ```python3
   def task_instance_mutation_hook(ti):
       print("MUTATION HOOK CALLED")
   ```
   
   and run `airflow dags test mydagname $(date "+%Y-%m-%d")`, the message appears in stdout:
   ```
   [2021-05-18 04:03:43,472] {dagbag.py:487} INFO - Filling up the DagBag from /usr/local/airflow/dags
   MUTATION_HOOK_CALLED
   INFO - Adding to queue:  ['<TaskInstance: mydagname.mytaskname ...
   ```
   
   If I add the import and the type hint as shown above, the message stops showing up.  I still need to check whether the image I'm testing with includes the fix--but I think I'm replicating it at least.


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