I'm spit-balling here, but I suspect the problem is that TimedRotatingFileHandler was probably not designed to have multiple instances of it in different processes all trying to rotate the same file. Yet that's the situation you have since each subprocess in your process pool creates its own handler instance.
I've not used it myself, but I believe that this is effectively the problem that QueueHandler and QueueListener were created to solve: https://docs.python.org/3.7/library/logging.handlers.html#queuehandler The parent process should create a queue and a QueueListener to service that queue, using the TimedRotatingFileHandler. Each subprocess should log to the queue using QueueHandler instead. This way the actual log file is only handled by one process. On Mon, Oct 8, 2018 at 1:54 PM <liamhanni...@gmail.com> wrote: > > From the logging docs I found out there was another avenue (comp.lang.python) > to ask questions about it. I already posted to stackoverflow but if anyone > could help out here or via stackoverflow I would greatly appreciate it. Here > is the link to my question: > > https://stackoverflow.com/questions/52708756/how-to-use-pythons-built-in-logging-with-asyncio-permission-error > -- > https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
