#15729: Cache middleware issues after restart when using mod_wsgi with PyLibMC
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Reporter: jsdalton | Owner: nobody
Status: new | Milestone:
Component: Core (Cache system) | Version: 1.3
Keywords: | Triage Stage: Unreviewed
Has patch: 0 |
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I'm running into a cache error using the PyLibMC cache backend in
conjunction with mod_wsgi.
I have a strong feeling it's related to #15655 and is probably an issue
for the pylibmc maintainers and not Django. I do feel, however, that the
issue is worth reporting here because it is occurring on a pretty standard
installation with the recommended web server (mod_wsgi). It also makes me
wonder whether more robust error handling might need to be built into the
PyLibMC backend to account for ways things could go wrong.
So, the gist of the problem: I have memcached running on a separate server
and PyLibMC as the memcached backend. Things work great...until I restart
memcached. After doing so I get the following traceback:
{{{
Traceback (most recent call last):
File "/var/www/****/src/django/django/core/handlers/base.py", line 89, in
get_response
response = middleware_method(request)
File "/var/www/*****/src/django/django/middleware/cache.py", line 143, in
process_request
cache_key = get_cache_key(request, self.key_prefix, 'GET',
cache=self.cache)
File "/var/www/*****/src/django/django/utils/cache.py", line 190, in
get_cache_key
headerlist = cache.get(cache_key, None)
File "/var/www/*****/src/django/django/core/cache/backends/memcached.py",
line 58, in get
val = self._cache.get(key)
UnknownReadFailure: error 7 from memcached_get: UNKNOWN READ FAILURE
}}}
Restarting Apache resolved this error.
The issue does not occur when using MemcachedCache backend.
--
Ticket URL: <http://code.djangoproject.com/ticket/15729>
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