Replace MemcachedCache backend with PymemcacheCache

[iamsobanjaved]

The django.core.cache.backends.memcached.MemcachedCache backend is removed so we now are replacing this with PymemcacheCache in all of our IDAs, so we need to replace this for credentials also.

https://docs.djangoproject.com/en/4.2/releases/4.1/#features-removed-in-4-1

Update in following environments

Beta Give feedback

1. devstack
2. stage
3. production
4. edge
5. sandbox

[mumarkhan999]

Things to be done:

• First, add pymemcache dependency in the codebase and move it to PROD
• Update the relevant configs for sandbox in sandbox-internal
• Update the relevant configs for stage in edx-internal
• Update the relevant configs for prod in edx-internal
• Update the relevant configs for edge in edge-internal
• Update the configs in related codebase so that the docker images of that service also get updated

[mumarkhan999]

These are the config related changes which we will do:

• Update the backend
  • https://github.com/edx/sandbox-internal/blob/master/sandbox-remote-config/sandbox/lms.yml#L58
• Add extra parameters for pymemcache hashclient to enable pooling. It will make the client thread-safe.
  • https://github.com/edx/sandbox-internal/blob/master/sandbox-remote-config/sandbox/lms.yml#L63-L66

[mumarkhan999]

One more thing to add:

• The IDA/services which are using edx-django-utils as their direct-dependency. We will enable edx_django_utils.cache.disable_forced_cache_miss_for_none waffle switch for them from their admin panel link to doc

[justinhynes]

@iamsobanjaved & @UsamaSadiq

I believe this work has been completed some time ago. Is there any reason to keep the issue open? Is there any remaining work to be done here?

[iamsobanjaved]

Thanks for reminding, closed the issue