[GitHub] [airflow] coufon opened a new pull request #5701: [AIRFLOW-5088] Add DAG serialization using JSON

[GitBox <gi...@apache.org>]

coufon opened a new pull request #5701: [AIRFLOW-5088] Add DAG serialization using JSON
URL: https://github.com/apache/airflow/pull/5701
 
 
   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira 5088](https://issues.apache.org/jira/browse/AIRFLOW-5088)
     - AIP-24: https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-24+DAG+Persistence+in+DB+using+JSON+for+Airflow+Webserver+and+%28optional%29+Scheduler
   
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   It implements the method proposed in [AIP-24](https://cwiki.apache.org/confluence/display/AIRFLOW/AIP-24+DAG+Persistence+in+DB+using+JSON+for+Airflow+Webserver+and+%28optional%29+Scheduler) to serialize DAG. It will be used in DAG persistency in DB to solve webserver scalability issue.
   
   
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
    - Unit test: tests/dags/test_dag_serialization.py for DAG serialization
   - End-to-End UI test: the usage of DAG serialization in web UI has been tested in PR https://github.com/apache/airflow/pull/5594. That PR contains the same DAG serialization code, but with an asynchronous DAG loader that use serialized DAGs in UI.
   
   ### Commits
   
   - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [x] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
   ### Code Quality
   
   - [ ] Passes `flake8`
   

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