houqp opened a new pull request #7492: [AIRFLOW-6871] optimize tree view for large DAGs URL: https://github.com/apache/airflow/pull/7492 This change reduces page size by more than 10X and reduces page load time by 3-5X. As a result, the tree view can now load large DAGs that were causing 5XX error without the patch. Another example: one of our DAGs' tree view had a page size of 200MB and took 1 minute to load. With this patch, it now loads within 24s with page size of 17MB. List of optimizations applied to the view handler: * only seralize used task instance attributes to json instead of the whole ORM object * encode task instance attributes as array instead of dict * encode datetime in unix timestamp instead of iso formmat string * push task instance attribute construction into client side JS * remove redundant task instance attributes * simplify reduce_nodes() logic, remove unnecessary if statements * seralize JSON as string to be used with JSON.parse on the client side to speed up browser JS parse time --- 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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