子进程中的父记录器

Question

在 Python 的 Logging Cookbook 中，"A more elaborate multiprocessing example" 部分中有以下 cmets：

# The worker process configuration is just a QueueHandler attached to the
# root logger, which allows all messages to be sent to the queue.
# We disable existing loggers to disable the "setup" logger used in the
# parent process. This is needed on POSIX because the logger will
# be there in the child following a fork().

# The listener process configuration shows that the full flexibility of
# logging configuration is available to dispatch events to handlers however
# you want.
# We disable existing loggers to disable the "setup" logger used in the
# parent process. This is needed on POSIX because the logger will
# be there in the child following a fork().

在子进程中有父记录器到底有什么问题？

Answer 1

（潜在的）问题是，如果父进程和子进程一样继续记录，它们可能会记录到相同的处理程序（因为 fork 在 POSIX 上的工作方式）并且您不能保证同时从两个进程写入单个文件将正常工作。请参阅食谱中this section 的第一段。