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[1.5.x] Fixed #20493 -- Added a warning that objects may not be pickl…

…able across Django versions

Thanks cataliniacob for the suggestion and review.

Backport of 1084575 from master
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1 parent abce5ab commit f551d5a3de4f32f0b6322a1d884990e34ab67528 @timgraham timgraham committed Jul 8, 2013
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  1. +8 −0 docs/howto/upgrade-version.txt
@@ -89,3 +89,11 @@ Deployment
When you are sufficiently confident your app works with the new version of
Django, you're ready to go ahead and :doc:`deploy </howto/deployment/index>`
your upgraded Django project.
+If you are using caching provided by Django, you should consider clearing your
+cache after upgrading. Otherwise you may run into problems, for example, if you
+are caching pickled objects as these objects are not guaranteed to be
+pickle-compatible across Django versions. A past instance of incompatibility
+was caching pickled :class:`~django.http.HttpResponse` objects, either
+directly or indirectly via the :func:`~django.views.decorators.cache.cache_page`

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