Airflow ignores resource pool flag when backfilling
<p><a href="https://i.stack.imgur.com/3G3NU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/3G3NU.png" alt="Airflow Backfill Sample"></a></p>

<p>Command:</p>

<pre><code>python dag.py backfill -i -t task1 --pool backfill -s "2016-05-29 03:00:00" -e "2016-06-07 00:00:00"
</code></pre>

<p>All the tasks get queue and all start running. Max capacity is essentially ignored.</p>