#27641: Default CACHES uses Locmem which isn't suitable for production
-------------------------------------+-------------------------------------
Reporter: Adam | Owner: Adam Chainz
Chainz |
Type: | Status: assigned
Cleanup/optimization |
Component: Core | Version: 1.10
(Cache system) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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The default CACHES that Django uses is defined in `global_settings` as:
{{{
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
}
}
}}}
Django also enforces that you have a cache called 'default' defined:
https://docs.djangoproject.com/en/1.10/ref/checks/#caches
`LocMemCache` only works within a single process and thus is not suitable
for even the smallest application deployments these days, which nearly
always use multiple web worker processes under uWSGI/gunicorn. (For
example, [https://github.com/unbit/uwsgi-
docs/blob/master/tutorials/heroku_python.rst this uWSGI Heroku tutorial]
has config for 4 processes).
The way Django uses caching is to assume there's a single cache for the
whole application which could lead code to break in unexpected ways in
production.
I'd like to suggest either:
1. A deployment check that the cache used in production is not locmemcache
2. The default cache backend used in `global_settings` be changed to
`DummyCache`
Since (2) is probably highly backwards incompatible, I think (1) is
preferable.
--
Ticket URL: <https://code.djangoproject.com/ticket/27641>
Django <https://code.djangoproject.com/>
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