#13977: Indeterministic PicklingError
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Reporter: etam | Owner: nobody
Status: new | Milestone:
Component: Serialization | Version: 1.2
Resolution: | Keywords:
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 1
Needs_better_patch: 0 |
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Changes (by aweakley):
* needs_tests: 0 => 1
Comment:
There seems to be more detail about this specific instance here:
http://stackoverflow.com/questions/3292383/django-mod-wsgi-picklingerror-
while-saving-object
This page indicates that pickle for certain types of object may be fragile
with mod_wsgi:
http://code.google.com/p/modwsgi/wiki/IssuesWithPickleModule
If the decimal module came to be reloaded somehow between the creation of
the Decimal instance and the attempt to pickle it, then that might give
this error:
{{{
>>> import decimal
>>> three = decimal.Decimal(3)
>>> cPickle.dumps(three)
"cdecimal\nDecimal\np1\n(S'3'\ntRp2\n."
>>> reload(decimal)
<module 'decimal' from
'/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/decimal.pyc'>
>>> cPickle.dumps(three)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
cPickle.PicklingError: Can't pickle <class 'decimal.Decimal'>: it's not
the same object as decimal.Decimal
}}}
We need some more information about the server environment and wsgi setup
before we could write a test case that could reproduce the problem.
--
Ticket URL: <http://code.djangoproject.com/ticket/13977#comment:3>
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