New importer redundantly reloading modules.
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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
Fix For: 3.3.x
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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