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[OpenStack Infra <2091678@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/horizon/+/937664
Committed: https://opendev.org/openstack/horizon/commit/8ccaf47a7fabfc06b53acef9f9b5cda30ac5b97c
Submitter: "Zuul (22348)"
Branch:    master

commit 8ccaf47a7fabfc06b53acef9f9b5cda30ac5b97c
Author: Takashi Kajinami <kajinamit@xxxxxxxxxxxxxxx>
Date:   Fri Dec 13 12:18:41 2024 +0900

    doc: Switch to PyMemcacheCache backend
    
    MemcachedCache backend was already removed in django 4.1[1] but horizon
    requires django>=4.2 now[2]. So the backend can no longer be used.
    
    [1] https://github.com/django/django/commit/05f3a6186efefc9fca2204a745b992501c6fd91f
    [2] 605a515ebc31beb66ff46cb193bc96c62d086ff6
    
    Closes-Bug: 2091678
    Change-Id: I02afc8644ef801f2afba6ac03ac7fd0a8b109e77


** Changed in: horizon
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2091678

Title:
  django memcache error while starting horizon

Status in OpenStack Dashboard (Horizon):
  Fix Released

Bug description:
  Following official doc for Horizon configuration (https://docs.openstack.org/horizon/2024.2/install/install-rdo.html) brings wrong configuration 
  memcached session storage service:

  [Thu Dec 12 20:34:05.924551 2024] [wsgi:error] [pid 62666:tid 62796]
  [remote 10.101.14.143:57809]
  django.core.cache.backends.base.InvalidCacheBackendError: Could not
  find backend 'django.core.cache.backends.memcached.MemcachedCache':
  Module "django.core.cache.backends.memcached" does not define a
  "MemcachedCache" attribute/class


  You should use default config from /etc/openstack-
  dashboard/local_settings :

  CACHES = {
      ...
          'BACKEND': 'django.core.cache.backends.memcached.PyMemcacheCache',
          ...
      }

  SESSION_ENGINE = 'django.contrib.sessions.backends.signed_cookies'

  
  Issue is actual for Dalmatian 2024.2

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