SamWheating commented on a change in pull request #21829:
URL: https://github.com/apache/airflow/pull/21829#discussion_r815249494
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File path: airflow/models/dag.py
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@@ -2625,6 +2625,18 @@ def validate_schedule_and_params(self):
"DAG Schedule must be None, if there are any required
params without default values"
)
+ @provide_session
+ def validate_task_pools(self, session=NEW_SESSION):
+ """Validates and raise exception if any task in a dag is using a
non-existent pool"""
+ from airflow.models.pool import Pool
+
+ pools = [p.pool for p in Pool.get_pools(session)]
+ for task in self.tasks:
+ if task.pool not in pools:
+ raise PoolNotFound(
Review comment:
In the event of multiple tasks with non-existent pools, is it preferable
to fail as fast as possible and only warn about the first such occurrence, or
should we first check all of the tasks and then raise with an error which
reports all of the issues?
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