[GitHub] ubermen opened a new pull request #3667: [AIRFLOW-1298] Add clear option 'only_failed_or_upstream_failed'

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

ubermen opened a new pull request #3667: [AIRFLOW-1298] Add clear option 'only_failed_or_upstream_failed'
URL: https://github.com/apache/incubator-airflow/pull/3667
 
 
   ### JIRA
   - [x] My PR addresses the following [Airflow Jira]
   - https://issues.apache.org/jira/browse/AIRFLOW-1298
   
   ### Description
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   In my operations team, it is necessary to clear all tasks in one command line (because of so many schedules should be reprocessed cause of some reasons)
   But, 'clear -cdf ...' is only clearing failed tasks without upstream_failed. It is not fit for our operator's needs.
   So, I want to add new options to clear failed or upstream_failed jobs all at once.
   
   
   ### Tests
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   1. clear only one schedule of this task : airflow clear -cp -s 2018-07-22T05:00:00 -e 2018-07-22T05:00:00 -t ^task_name$ schedule_name
   2. clear only multiple schedules of this task : airflow clear -cp -s 2018-07-22T05:00:00 -e 2018-07-22T09:00:00 -t ^task_name$ schedule_name
   3. clear multiple schedules of this task with downstream : airflow clear -cdp -s 2018-07-22T05:00:00 -e 2018-07-22T09:00:00 -t ^task_name$ schedule_name
   
   ### 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.
   new option of clear command
   option is 'p' of upstream_failed's p character.
   Usage sample is like below :
   airflow clear -cdp -s 2018-07-22T05:00:00 -e 2018-07-22T09:00:00 -t ^task_name$ schedule_name
   
   ### Code Quality
   
   - [x] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

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