[jira] [Commented] (AIRFLOW-4549) wait_for_downstream does not respect skipped tasks

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-4549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16844509#comment-16844509 ] 

ASF GitHub Bot commented on AIRFLOW-4549:
-----------------------------------------

dima-asana commented on pull request #5308: [AIRFLOW-4549] skipped tasks should be ok for wait_for_downstream
URL: https://github.com/apache/airflow/pull/5308
 
 
   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-4549
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   this PR updates wait_for_downstream dependency to be satisfied for tasks that are skipped.  This is desirable because 
   (a) depends_on_past, which this is interacts with, allows skipped tasks
   (b) documentation for wait_for_downstream mentions it is to avoid resource conflicts, which are de facto avoided when a task is skipped
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   TaskInstanceTest.test_wait_for_downstream
   
   ### 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
   
   - [x] Passes `flake8`
   
 
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> wait_for_downstream does not respect skipped tasks
> --------------------------------------------------
>
>                 Key: AIRFLOW-4549
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-4549
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: scheduler
>            Reporter: Dima Kamalov
>            Assignee: Dima Kamalov
>            Priority: Major
>
> See [http://mail-archives.apache.org/mod_mbox/airflow-dev/201609.mbox/%3CCAHEEp7UTGPjVKgww9_9N5FUpNU+PSKF3RmBvXUGK5dxb6bhjbw@mail.gmail.com%3E]



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