Le 07/04/2012 11:22, Thibaut DIRLIK a écrit :
Hi,
I'm currently writing a multiprocess applications with Python 3.2 and
multiprocessing module. My subprocesses will use a QueueHandler to log
messages (by sending them to the main process, which uses a
QueueListener). However, if logging is already configured when I
create the subprocesses, they will inherit the configuration, and
opened file descriptors used for logging in the main process.
However, when I tried this with a basicConfig configuration, which
prints to a file, the messages are only written once to the file. I
don't understand why. Normally, the mainprocess contains a logging
handler to log to the file. This handler will be copied into the child
processes. Child processes will then have two handlers : a
QueueHandler, and a FileHandler. They should write to the file handler
and then send the message to the main process QueueListener, which
should write the message AGAIN to the FileHandler.
But that's not the case. Any rea
How can I totally "unset" the logging configuration in child processes
and only enable the QueueHandler (foor all configured loggers, not
only the root one) ?
Thanks for your help,
Ok, I understand what happenned. In fact, configuring the logging before
forking works fine. Subprocess inherits the configuration, as I thought.
The problem was that I didn't passed any handler to the QueueListener
constructor. The when the listener recieved an message, it wasn't handled.
I'm not sure how the logging module works, but what handlers should I
pass the QueueListener constructor ? I mean, maybe that I would like
some messages (depending of the logger) to be logged to a file, while
some others message would just be printed to stdout.
This doesn't seem to be doable with a QueueListener. Maybe I should
implement my own system, and pass a little more informations with the
record sent in the queue : the logger name for example.
Then, in the main process I would do a logging.getLogger(loggername) and
log the record using this logger (by the way it was configured).
What do you think ?
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