lyso opened a new pull request, #29602: URL: https://github.com/apache/airflow/pull/29602
<!-- 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 an 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/ --> This PR changes the default value for configure ``scheduler.max_tis_per_query`` to 16 and update related document. Before this change `scheduler.max_tis_per_query=512` by default. ``scheduler.max_tis_per_query`` should not be greater than ``core.parallelism`` according to related code [[1]](https://github.com/apache/airflow/blob/49867b660b6231c1319969217bc61917f7cf9829/airflow/jobs/scheduler_job.py#L581) and [[2]](https://github.com/apache/airflow/blob/49867b660b6231c1319969217bc61917f7cf9829/airflow/executors/base_executor.py#L331). If both configurations use default value, the default 512 of `max_tis_per_query` is never used. After this PR, default will set ``scheduler.max_tis_per_query=16`` and ``core.parallelism=32``. This will make the executor can be populated in two iteration of scheduler main loop. The actual change applied in Airflow runtime by this PR is to reduce the ``max_tis`` from 32 to 16. The query batch size reduced. This can help scheduler finish the iteration faster. Thus make scheduler more responsive and healthy. This PR also updated related document about ``scheduler.max_tis_per_query`` to help users understand how to set this configuration. --- **^ Add meaningful description above** 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 changes, an Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvement+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 a newsfragment file, named `{pr_number}.significant.rst` or `{issue_number}.significant.rst`, in [newsfragments](https://github.com/apache/airflow/tree/main/newsfragments). -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
