c-wilson opened a new pull request #7740: [AIRFLOW-7065] Add optional propagation of task std streams to console URL: https://github.com/apache/airflow/pull/7740 Both `stdout` and `stderr` are captured during Task execution to allow handling custom log writers. While this is great, there are cases where forwarding task execution output to system streams (console) during task runtime is advantageous (ie for capture by docker logging drivers). Adding a `LogHandler` that wrote to stdout or stderr would result in an infinite loop of message forwarding `stdout > StreamLogHandler > logger > stdout > StreamLogHander > ...` This adds a configuration flag ['logging']['task_log_to_console'] which enables forwarding of task stream messages to the console when set. This is implemented via a new context manager that adds existing system stream targets as targets for the `StreamLogWriter`. There is some implementation of log target replacement that is essentially duplicated from the stdlib, but I could not think of a better way to do this without a subclassing death-spiral. It has decent tests, and I do not think that this will be difficult to keep unbroken. --- Issue link: WILL BE INSERTED BY [boring-cyborg](https://github.com/kaxil/boring-cyborg) Make sure to mark the boxes below before creating PR: [x] - [x] Description above provides context of the change - [x] Commit message/PR title starts with `[AIRFLOW-NNNN]`. AIRFLOW-NNNN = JIRA ID<sup>*</sup> - [x] Unit tests coverage for changes (not needed for documentation changes) - [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). <sup>*</sup> For document-only changes commit message can start with `[AIRFLOW-XXXX]`. --- 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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