wongelz commented on issue #15399:
URL: https://github.com/apache/airflow/issues/15399#issuecomment-820915616
I see that `occupied_slots` includes QUEUED as well (`EXECUTION_STATES`
includes RUNNING & QUEUED).
QUEUED tasks shouldn't be occupying slots in the pool should they?
```
@provide_session
def occupied_slots(self, session: Session):
"""
Get the number of slots used by running/queued tasks at the moment.
...
return (
session.query(func.sum(TaskInstance.pool_slots))
.filter(TaskInstance.pool == self.pool)
.filter(TaskInstance.state.in_(list(EXECUTION_STATES)))
.scalar()
) or 0
```
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