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Subject [GitHub] XD-DENG opened a new pull request #3688: [AIRFLOW-2843] ExternalTaskSensor-check if external task exists
Date Fri, 03 Aug 2018 14:32:02 GMT
XD-DENG opened a new pull request #3688: [AIRFLOW-2843] ExternalTaskSensor-check if external
task exists
   ### Jira
   - [x] My PR addresses the following [Airflow Jira](
issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - 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.
   ### Description
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   #### Background
   `ExternalTaskSensor` will keep waiting (given restrictions of retries, poke_interval, etc),
even if the external task specified doesn't exist at all. In some cases, this waiting may
still make sense as new DAG may backfill.
   But it may be good to provide an option to cease waiting immediately if the external task
specified doesn't exist.
   #### Proposal
   Provide an argument `check_existence`. Set to `True` to check if the external task exists,
and immediately cease waiting if the external task does not exist.
   **The default value is set to `False` (no check or ceasing will happen), so it will not
affect any existing DAGs or user expectation.**
   ### 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
     - When adding new operators/hooks/sensors, the autoclass documentation generation needs
to be added.
   ### Code Quality
   - [ ] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`

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