mik-laj opened a new pull request #7327: [AIRFLOW-6706] Lazy load operator extra links URL: https://github.com/apache/airflow/pull/7327 When we import the airflow package, many modules are loaded, so I looked at what modules are exactly loaded. I found a lot of classes that should not be loaded and delay the start of the application very much. I suggest that some classes be loaded lazily when needed. Performance benchmark: ``` seq 1 10 | xargs -n 1 -I {} time python -c "import airflow; import sys; print(len(sys.modules));" ``` Before: ``` 1521 3.45 real 1.83 user 0.59 sys 1521 1.86 real 1.60 user 0.40 sys 1521 1.87 real 1.61 user 0.40 sys 1521 1.83 real 1.60 user 0.39 sys 1521 1.84 real 1.62 user 0.40 sys 1521 2.00 real 1.71 user 0.42 sys 1521 1.84 real 1.60 user 0.41 sys 1521 1.84 real 1.60 user 0.40 sys 1521 1.90 real 1.64 user 0.41 sys 1521 1.87 real 1.61 user 0.42 sys ``` After ``` 941 1.79 real 0.95 user 0.27 sys 941 1.23 real 0.90 user 0.20 sys 941 1.26 real 0.90 user 0.21 sys 941 1.25 real 0.89 user 0.20 sys 941 1.25 real 0.88 user 0.20 sys 941 1.30 real 0.90 user 0.21 sys 941 1.23 real 0.88 user 0.20 sys 941 1.19 real 0.87 user 0.19 sys 941 1.23 real 0.87 user 0.21 sys 941 1.20 real 0.87 user 0.20 sys ``` Result: <img width="518" alt="Screenshot 2020-02-01 at 18 42 24" src="https://user-images.githubusercontent.com/12058428/73596482-a5239a80-4522-11ea-9879-49d158264b81.png";> and 580 fewer modules - 61% If anyone is interested, I attach an exact log that shows the import process. https://gist.github.com/mik-laj/002f5a714c221ba04bc638970094519c CC: @evgenyshulman --- Issue link: WILL BE INSERTED BY [boring-cyborg](https://github.com/kaxil/boring-cyborg) Make sure to mark the boxes below before creating PR: [x] - [X] Description above provides context of the change - [X] Commit message/PR title starts with `[AIRFLOW-NNNN]`. AIRFLOW-NNNN = JIRA ID<sup>*</sup> - [X] Unit tests coverage for changes (not needed for documentation changes) - [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). <sup>*</sup> For document-only changes commit message can start with `[AIRFLOW-XXXX]`. --- 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] With regards, Apache Git Services
![https://user-images.githubusercontent.com/12058428/73596482-a5239a80-4522-11ea-9879-49d158264b81.png"](https://user-images.githubusercontent.com/12058428/73596482-a5239a80-4522-11ea-9879-49d158264b81.png"){kind=link}