[mod_python] multiple processing of the same python script by the handler

Hi List,

I have been working around, trying to resolve you name it this problem for at 
least a year now.  I don't know what to do anymore...everytime I implement 
some new functionality to my system I find myself writing bastard code to 
work around this issue.

The simplest way to 'reproduce' this issue is by using the logging module.

To explain this in its simplest form I can use the logging module. A simple 
script that takes all the parameters passed to the script via the url and log 
them to a file via the logger. 

from mod_python import Cookie, apache
from mod_python import util

import logging, logging.handlers

logger = logging.getLogger('mymodpythong app.py')
logging_handler = logging.FileHandler('/mylogfile.log')    
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
logging_handler.setFormatter(formatter)
logger.addHandler(logging_handler)
logger.setLevel(logging.INFO)

def handler(req):
	request_data = util.FieldStorage(req)
	clientip = req.get_remote_host(apache.REMOTE_NOLOOKUP)
	str_req_data = str(clientip) + "| "
	for key in request_data:
	        str_req_data += str(key) + ": " + str(request_data[key]) + "| "


	logger.info(str_req_data[:-2])
	return apache.OK



Now the behavior on my apache 2.2(on prefork mpm) is the following.  I can get 
1 line logged or 2 or 5 with the exact same data.  It almost looks like 
modpython process is processing the same data a few time sand who ever finish 
first get promoted to return the data to apache.  Now this doesn't only apply 
to logging, if I open a socket and send data to another server, on that 
server side they would get the same multiple same data. 

This is a log snapshot from my production system.  This is an log from a 
visitor who loads the page.  (the html page sends the onUnload event to the 
python script). As you can see mod python logged 3 times the same data

2009-03-28 21:57:49,854 INFO 76.177.106.67| CC: US| tdid: XXXXXXX| product: 
removed| version: db2.9| unloadTime: 0.003| unloadLoc: urlremoved| event: 
unload| Referer: urlremoved| cookietid: None
2009-03-28 21:57:49,854 INFO 76.177.106.67| CC: US| tdid: XXXXXXX| product: 
removed| version: db2.9| unloadTime: 0.003| unloadLoc: urlremoved| event: 
unload| Referer: urlremovedl| cookietid: None
2009-03-28 21:57:49,854 INFO 76.177.106.67| CC: US| tdid: XXXXXXX| product: 
removed| version: db2.9| unloadTime: 0.003| unloadLoc: urlremoved| event: 
unload| Referer: urlremoved| cookietid: None
2009-03-28 21:57:52,785 INFO 76.177.106.67| CC: US| tdid: XXXXXXX| product: 
removed| version: db2.9| unloadTime: 3.249| unloadLoc: urlremoved| event: 
onload| Referer: urlremoved| cookietid: None
2009-03-28 21:57:52,785 INFO 76.177.106.67| CC: US| tdid: XXXXXXX| product: 
removed| version: db2.9| unloadTime: 3.249| unloadLoc: urlremoved| event: 
onload| Referer: urlremoved| cookietid: None
2009-03-28 21:57:52,785 INFO 76.177.106.67| CC: US| tdid: XXXXXXX| product: 
removed| version: db2.9| unloadTime: 3.249| unloadLoc: urlremoved| event: 
onload| Referer: urlremoved| cookietid: None


Thanks,

David