[Bug 2039225] Re: django.core.cache.backends.memcached.MemcachedCache backend is removed

[Takashi Kajinami]

There is a patch to update the default cache backend. We can probably use it.
 https://review.opendev.org/c/openstack/horizon/+/891828

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https://bugs.launchpad.net/bugs/2039225

Title:
  django.core.cache.backends.memcached.MemcachedCache backend is
  removed

Status in OpenStack Dashboard Charm:
  In Progress
Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive bobcat series:
  Triaged
Status in OpenStack Dashboard (Horizon):
  New
Status in horizon package in Ubuntu:
  Triaged
Status in horizon source package in Mantic:
  Triaged

Bug description:
  In 4.1 the django.core.cache.backends.memcached.MemcachedCache backend
  is removed.

  https://github.com/django/django/blob/main/docs/releases/4.1.txt#L749

  It's been deprecated since 3.2:

  https://docs.djangoproject.com/en/4.2/releases/3.2/#features-
  deprecated-in-3-2

  "The django.core.cache.backends.memcached.MemcachedCache backend is
  deprecated as python-memcached has some problems and seems to be
  unmaintained. Use django.core.cache.backends.memcached.PyMemcacheCache
  or django.core.cache.backends.memcached.PyLibMCCache instead."

  This results in the following error on Ubuntu Mantic:

  InvalidCacheBackendError at /
  Could not find backend 'django.core.cache.backends.memcached.MemcachedCache': Module "django.core.cache.backends.memcached" does not define a "MemcachedCache" attribute/class
  Request Method:	GET
  Request URL:	http://10.5.3.66/horizon/
  Django Version:	4.2.4
  Exception Type:	InvalidCacheBackendError
  Exception Value:
  Could not find backend 'django.core.cache.backends.memcached.MemcachedCache': Module "django.core.cache.backends.memcached" does not define a "MemcachedCache" attribute/class
  Exception Location:	/usr/lib/python3/dist-packages/django/core/cache/__init__.py, line 49, in create_connection
  Python Executable:	/usr/bin/python3
  Python Version:	3.11.6
  Python Path:
  ['/usr/lib/python3/dist-packages',
   '/usr/lib/python311.zip',
   '/usr/lib/python3.11',
   '/usr/lib/python3.11/lib-dynload',
   '/usr/local/lib/python3.11/dist-packages',
   '/usr/lib/python3/dist-packages',
   '/usr/lib/python3/dist-packages/openstack_dashboard']
  Server time:	Thu, 12 Oct 2023 20:44:30 +0000

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