XD-DENG opened a new pull request #3674: [AIRFLOW-2836] Minor improvement of contrib.sensors.FileSensor URL: https://github.com/apache/incubator-airflow/pull/3674 ### 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-2836 - 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 The default `fs_conn_id` in `contrib.sensors.FileSensor` is 'fs_default2'. However, when we initiate the database (https://github.com/apache/incubator-airflow/blob/master/airflow/utils/db.py#L88), there isn't such an entry. It doesn't exist anywhere else. #### Issue The purpose of `contrib.sensors.FileSensor` is mainly for checking local file system (of course can also be used for NAS). Then the path ("/") from default connection 'fs_default' would suffice. However, given the default value for fs_conn_id in contrib.sensors.FileSensor is "fs_default2" (a value doesn't exist), it will make the situation much more complex. When users intend to check local file system only, they should be able to leave fs_conn_id default directly, instead of going setting up another connection separately. #### Proposal Change default value for `fs_conn_id` in `contrib.sensors.FileSensor` from "fs_default2" to "fs_default" (actually in the related test, the `fs_conn_id` are all specified to be "fs_default"). ### 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](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. - 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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