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Update scheduler docs about low priority tasks #28831

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Jan 11, 2023
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Update scheduler docs about low priority tasks #28831

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Update scheduler docs about low priority tasks
eladkal Jan 10, 2023
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uranusjr Jan 11, 2023
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8 changes: 8 additions & 0 deletions docs/apache-airflow/administration-and-deployment/scheduler.rst
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Expand Up @@ -59,6 +59,14 @@ In the UI, it appears as if Airflow is running your tasks a day **late**

You should refer to :doc:`../core-concepts/dag-run` for details on scheduling a DAG.

.. note::
The scheduler is designed for high throughput. This is an informed design decision to achieve scheduling
tasks as soon as possible. The scheduler checks how many free slots available in a pool and schedule at most that number of tasks instances in one iteration.
This means that task priority will only come in to effect when there are more scheduled tasks
waiting than the queue slots. Thus there can be cases where low priority tasks will be schedule before high priority tasks if they share the same batch.
For more read about that you can reference `this GitHub discussion <https://github.com/apache/airflow/discussions/28809>`__.


DAG File Processing
-------------------

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