id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
29994	Document performance issues in FileBasedCache	Mateusz Konieczny	Sarah Boyce	"https://docs.djangoproject.com/en/2.1/topics/cache/#filesystem-caching is not mentioning any problems with FileBasedCache

According to https://github.com/grantjenks/python-diskcache#diskcache-disk-backed-cache ""Unfortunately the file-based cache in Django is essentially broken. The culling method is random and large caches repeatedly scan a cache directory which slows linearly with growth. Can you really allow it to take sixty milliseconds to store a key in a cache with a thousand items?""

From my checking it seems to not be reported so far.

According to https://github.com/grantjenks/python-diskcache/issues/93#issuecomment-442580191 ""The deficiencies of FileBasedCache are too well known to require enumeration"" but it would be nice to warn also developers unaware of this problems."	Cleanup/optimization	closed	Documentation	2.1	Normal	fixed		Sarah Boyce	Ready for checkin	1	0	0	0	0	0