#29994: Document performance issues in FileBasedCache
               Reporter:  matkoniecz     |          Owner:  nobody
                   Type:  Uncategorized  |         Status:  new
              Component:  Documentation  |        Version:  2.1
               Severity:  Normal         |       Keywords:
           Triage Stage:  Unreviewed     |      Has patch:  0
    Needs documentation:  0              |    Needs tests:  0
Patch needs improvement:  0              |  Easy pickings:  0
                  UI/UX:  0              |
 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.

Ticket URL: <https://code.djangoproject.com/ticket/29994>
Django <https://code.djangoproject.com/>
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