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https://issues.apache.org/jira/browse/MODPYTHON-219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Graham Dumpleton updated MODPYTHON-219:
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Fix Version/s: (was: 3.3.x)
> New importer redundantly reloading modules.
> -------------------------------------------
>
> Key: MODPYTHON-219
> URL: https://issues.apache.org/jira/browse/MODPYTHON-219
> Project: mod_python
> Issue Type: Bug
> Components: importer
> Affects Versions: 3.3.1
> Reporter: Graham Dumpleton
>
> Although the new module importer prevents two threads trying to load a module
> at the same time, the transition from checking to see if a module requires
> (re)loading to the actual loading isn't properly thread protected and as a
> result a second thread, although it may decide a module needs (re)loading,
> isn't simply waiting for the first thread to finish the loading and use the
> result of that and is instead loading the module again even though no change
> has been made.
> This issue was highlighted in following mailing list posts:
> http://www.modpython.org/pipermail/mod_python/2007-May/023583.html
> http://www.modpython.org/pipermail/mod_python/2007-May/023586.html
> Further discussion can be found in the associated posts for that thread in
> the archives.
> Note that this only affects multithreaded Apache MPMs and the window for this
> to happen is very small and is only going to occur under heavy load from
> multiple clients or in web pages where multiple requests may be made from a
> page to a resource requiring the same code module be loaded.
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