houqp opened a new pull request #9042:
URL: https://github.com/apache/airflow/pull/9042
Without this detection code, breeze just fails with the following error:
```
===============================================================================================
Checking backend: mysql
===============================================================================================
Checking if MySQL is ready for connections (double restarts in the logs)
............................................................
ERROR! Maximum number of retries while waiting for MySQL. Exiting
Last check: 0 connection ready messages (expected >=2)
```
With the change, it will fail with a more actionable error:
```
Starting docker-compose_mysql_1 ... done
Client: Docker Engine - Community
Version: 19.03.9
API version: 1.40
Go version: go1.13.10
Git commit: 9d988398e7
Built: Fri May 15 00:24:16 2020
OS/Arch: linux/amd64
Experimental: false
Error response from daemon: client version 1.40 is too new. Maximum
supported API version is 1.39
```
---
Make sure to mark the boxes below before creating PR: [x]
- [x] Description above provides context of the change
- [x] Unit tests coverage for changes (not needed for documentation changes)
- [x] Target Github ISSUE in description if exists
- [x] Commits follow "[How to write a good git commit
message](http://chris.beams.io/posts/git-commit/)"
- [x] Relevant documentation is updated including usage instructions.
- [x] I will engage committers as explained in [Contribution Workflow
Example](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#contribution-workflow-example).
---
In case of fundamental code change, Airflow Improvement Proposal
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals))
is needed.
In case of a new dependency, check compliance with the [ASF 3rd Party
License Policy](https://www.apache.org/legal/resolved.html#category-x).
In case of backwards incompatible changes please leave a note in
[UPDATING.md](https://github.com/apache/airflow/blob/master/UPDATING.md).
Read the [Pull Request
Guidelines](https://github.com/apache/airflow/blob/master/CONTRIBUTING.rst#pull-request-guidelines)
for more information.
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