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Graham Dumpleton
graham.dumpleton at gmail.com
Wed Jan 28 21:04:18 EST 2009
2009/1/29 Monsyne Dragon <mdragon at rackspace.com>: > Ok, this is an odd one, any clues we can get would help. > > Environment mod_python 3.1.4 w/ python 2.4 on Ubuntu dapper Upgrade to mod_python 3.3.1. That version is old and buggy. See: http://www.dscpl.com.au/wiki/ModPython/Articles/ModuleImportingIsBroken for one possible source of your problems. Secondly, remember that Apache is a multi process web server. Don't expect globals you set in one process to be visible in another. See: http://www.dscpl.com.au/wiki/ModPython/Articles/TheProcessInterpreterModel Graham > We have a web app running under mod_python (it uses an obscure templating > language/framework called PSE http://nick.borko.org/pse/) > > We are having an intermittent glitch which is truely bizarre. > Periodically, one module deep in this large webapp is losing it's global > namespace. On our production servers, this happens on random occasional > basis, but we have replicated it on another machine. On that machine it was > happening every other pagehit, > and is now happening every pagehit except the first one after restarting > apache (we don't know why this changed). > This manifests in mindbenders like: we will import a module, (like 'sys') > like so: > > import sys > > class SomeClass() > def __init__(self, args, go, here): > sys.stderr.write('Some message') > > This will run fine on the first hit, then subsequently will produce an > exception saying that "'NoneType' object has no attribute 'stderr'" !! > And it's not just 'sys' that that happens to. if we catch the exception and > print the contents of globals() at that point, ALL of the modules imported, > and any global variables have their values set to None! > > As far as we can tell, it is only happening to this one module in our > (large, hundreds of modules) codebase. The module itself is actually > generated code, generated by the ZSI-2.0 SOAP library, and we've exercised > this code from the command line hundreds of times without fail, running it > in a loop. It only fails like this in the mod_python environment, and then, > not every time. > > Does anyone have an idea of where to even begin to figure this out? > > > > -- > --M. Dragon > > > > Confidentiality Notice: This e-mail message (including any attached or > embedded documents) is intended for the exclusive and confidential use of > the > individual or entity to which this message is addressed, and unless > otherwise > expressly indicated, is confidential and privileged information of > Rackspace. > Any dissemination, distribution or copying of the enclosed material is > prohibited. > If you receive this transmission in error, please notify us immediately by > e-mail > at abuse at rackspace.com, and delete the original message. > Your cooperation is appreciated. > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python >
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