ashb commented on issue #6627: [AIRFLOW-5931] Use os.fork when appropriate to speed up task execution. URL: https://github.com/apache/airflow/pull/6627#issuecomment-557516476 So from a quick look: multiprocessing.Process does not like it when something else reaps the process (which we do via our reap_process_group) -- it thinks it is still running and errors if I attempt to call `close()` on it. So multiprocess.Process is not just a drop in replacement.
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