zbstof opened a new pull request #18730:
URL: https://github.com/apache/airflow/pull/18730
Currently, even if legacy `concurrency` dag parameter is specified, it is
always ignored because `max_active_runs` is always initialized from
`core.max_active_runs_per_dag`.
`concurrency` parameter should always be used, if provided, as this
preserves backward compatibility for users performing the migration.
For this reason, this patch should be backported to 2.1 branch as well.
Tested locally:
```
DAG(
dag_id='xxx',
...
concurrency=1,
)
```
Before fix:
```
{scheduler_job.py:413} INFO - DAG xxx has 1/16 running and queued tasks
```
After fix:
```
{scheduler_job.py:413} INFO - DAG xxx has 1/1 running and queued tasks
```
Read the **[Pull Request
Guidelines](https://github.com/apache/airflow/blob/main/CONTRIBUTING.rst#pull-request-guidelines)**
for more information.
In case of fundamental code change, Airflow Improvement Proposal
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals))
is needed.
In case of a new dependency, check compliance with the [ASF 3rd Party
License Policy](https://www.apache.org/legal/resolved.html#category-x).
In case of backwards incompatible changes please leave a note in
[UPDATING.md](https://github.com/apache/airflow/blob/main/UPDATING.md).
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