xinbinhuang commented on a change in pull request #14640:
URL: https://github.com/apache/airflow/pull/14640#discussion_r588860807
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File path: airflow/sensors/external_task.py
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@@ -134,20 +146,23 @@ def __init__(
self.execution_delta = execution_delta
self.execution_date_fn = execution_date_fn
self.external_dag_id = external_dag_id
+ self.external_task_group_id = external_task_group_id
self.external_task_id = external_task_id
self.check_existence = check_existence
Review comment:
This is `False` by default, which may make sense for external_dag or
external_task. But external_task_group has to check and get an existing dag in
order to get the list of task_ids.
I wonder if we can change the default to True or even have `check_existence`
enabled required? This can give more useful errors when the external task/dag
does not exist. Also, I can't think of the reason to have a Sensor waiting for
an object that doesn't exist until it times out
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