jhtimmins opened a new pull request #11589: URL: https://github.com/apache/airflow/pull/11589
In order to further reduce intra-dag task scheduling lag we add an optimization: when a task has just finished executing (success or failure) we can look at the downstream tasks of just that task, and then make scheduling decisions for those tasks there -- we've already got the dag loaded, and we know they are likely actionable as we just finished. We should set tasks to scheduled if we can (but no further, i.e. not to queued, as the scheduler has to make that decision with info about the Pool usage etc.). Co-authored-by: Ash Berlin-Taylor <ash_git...@firemirror.com> <!-- Thank you for contributing! Please make sure that your code changes are covered with tests. And in case of new features or big changes remember to adjust the documentation. Feel free to ping committers for the review! In case of existing issue, reference it using one of the following: closes: #ISSUE related: #ISSUE How to write a good git commit message: http://chris.beams.io/posts/git-commit/ --> --- **^ Add meaningful description above** Read the **[Pull Request Guidelines](https://github.com/apache/airflow/blob/master/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/master/UPDATING.md). ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
