[
https://issues.apache.org/jira/browse/AIRFLOW-6706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17028162#comment-17028162
]
ASF GitHub Bot commented on AIRFLOW-6706:
-----------------------------------------
mik-laj commented on 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.
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> Lazy load operator extra links
> ------------------------------
>
> Key: AIRFLOW-6706
> URL: https://issues.apache.org/jira/browse/AIRFLOW-6706
> Project: Apache Airflow
> Issue Type: Improvement
> Components: serialization
> Affects Versions: 1.10.7
> Reporter: Kamil Bregula
> Priority: Major
>
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