ashb opened a new pull request, #44263:
URL: https://github.com/apache/airflow/pull/44263
If we don't we keep any copies of it open then the selector loop in monitor
process will get stuck waiting on a read loop.
Sadly I wasn't able to reproduce this behaviour in unit tests, but only when
running this code for real. (The main fix here is to pass `child_stderr` to
_close_unused_sockets too, the rest are drive-by tidy ups)
Since we never access `proc.stdout` or stderr on the class (they are closed
over in the callbacks only) I removed those properties as they aren't needed
and shouldn't be accessed directly as it would lead to garbled output.
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