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From "ASF GitHub Bot (Jira)" <>
Subject [jira] [Commented] (AIRFLOW-5088) To implement DAG JSON serialization and DB persistence for webserver scalability improvement
Date Tue, 03 Sep 2019 11:08:00 GMT


ASF GitHub Bot commented on AIRFLOW-5088:

kaxil commented on pull request #5992: [AIRFLOW-5088][AIP-24][BackPort] Persisting serialized
DAG in DB for webserver scalability
   Make sure you have checked _all_ steps below.
   ### Jira
   - [x] My PR addresses the following [Airflow Jira](
issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
   ### Description
   - [ ] Here are some details about my PR, including screenshots of any UI changes:
   **Backport of for v1-10-* branches **
   Based on #5701, this PR implements functionalities including writing serialized DAGs to
DB in scheduler, reading DAGs from DB in webserver, controlled by [core] dagcached
   The goal is to decouple webserver from the DAG folder, instead it reads everything from
   Rendering template by functions is an exception, in that case it needs to re-import DAG,
because functions are stringified in serialized DAG.
   ### Tests
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely
good reason:
   ### Commits
   - [ ] 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](":
     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
   - [ ] In case of new functionality, my PR adds documentation that describes how to use
     - 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 [](
so we can assign it to a appropriate release
   ### Code Quality
   - [ ] Passes `flake8`
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> To implement DAG JSON serialization and DB persistence for webserver scalability improvement
> --------------------------------------------------------------------------------------------
>                 Key: AIRFLOW-5088
>                 URL:
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: DAG, webserver
>    Affects Versions: 1.10.5
>            Reporter: Zhou Fang
>            Assignee: Zhou Fang
>            Priority: Major
> Created this issue for starting to implement DAG serialization using JSON and persistence
in DB. Serialized DAG will be used in webserver for solving the webserver scalability issue.
> The implementation is based on AIP-24: []

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