Acehaidrey opened a new pull request #9544:
URL: https://github.com/apache/airflow/pull/9544
This is to emit the true scheduling delay stats, which is defined as
the time when the first
task in DAG starts minus the expected DAG run datetime. This method
will be used in the update_state method
when the state of the DagRun is updated to a completed status
(either success or failure).
The method will find the first started task within the DAG and
calculate the expected DagRun start time (
based on dag.execution_date & dag.schedule_interval), and minus
these two to get the delay.
The emitted data may contains outlier (e.g. when the first task was
cleared, so the second task's start_date
will be used), but we can get ride of the the outliers on the stats
side through the dashboards.
Note, the stat will only be emitted if the DagRun is a scheduler
triggered one (i.e. external_trigger is False).
This is all useful when you want to even measure executor delays,
considerations for adding more capacity, adding more scheduling processes, etc.
Measuring just the delay in the dagrun from its start time to expected time is
just one of the measurement, but measuring from the dag run to its first real
running job is important as well.
---
Make sure to mark the boxes below before creating PR: [x]
- [x] Description above provides context of the change
- [x] Unit tests coverage for changes (not needed for documentation changes)
- [x] Target Github ISSUE in description if exists
- [x] Commits follow "[How to write a good git commit
message](http://chris.beams.io/posts/git-commit/)"
- [x] Relevant documentation is updated including usage instructions.
- [x] I will engage committers as explained in [Contribution Workflow
Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example).
---
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).
Read the [Pull Request
Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines)
for more information.
----------------------------------------------------------------
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:
[email protected]
