[GitHub] [airflow] ahuynh3 opened a new pull request #5193: [AIRFLOW-4418] Add clear failed only button to DAG modal

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ahuynh3 opened a new pull request #5193: [AIRFLOW-4418] Add clear failed only button to DAG modal
URL: https://github.com/apache/airflow/pull/5193
 
 
   Make sure you have checked _all_ steps below.
   
   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-XXX
     - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
     - In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)).
     - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   Add a button to **Clear Only Failed** to DAG modal:
   ![image](https://user-images.githubusercontent.com/47340368/56839907-ac9e7080-6839-11e9-94f5-994075895fd6.png)
   This button functions similarly to the existing **Clear** button, but only considers failed tasks. This may be useful if you have tasks that have failed, and want to rerun them with a single click while keeping successful tasks as is.
   
   Consider the following example DAG:
   
   ![image](https://user-images.githubusercontent.com/47340368/56839969-fe46fb00-6839-11e9-8a38-8c6c3565c670.png)
   ![image](https://user-images.githubusercontent.com/47340368/56840009-2afb1280-683a-11e9-92da-f499efa7369f.png)
   ![image](https://user-images.githubusercontent.com/47340368/56840018-32bab700-683a-11e9-8ab9-4ec2cc19f0c6.png)
   
   Hitting the **Clear Only Failed** button should recursively clear all failed tasks:
   ![image](https://user-images.githubusercontent.com/47340368/56840073-6e558100-683a-11e9-82bb-82f10b816cb9.png)
   
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   Just adding a route that is similar to an existing route (/dagrun_clear) and a button to the UI that ultimately calls the clear method of the DAG class, which is already tested.
   
   ### 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
   
   - [] 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
   
   - [x] Passes `flake8`
   

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