#15149: Memcached backend: possible issue with cache keys
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Reporter: jeff@… | Owner: nobody
Status: new | Milestone:
Component: Cache system | Version: SVN
Resolution: | Keywords: memcached
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 |
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Comment (by jeff@…):
Purging .pyc files didn't help. I even tried a totally fresh checkout of
Django trunk. Here's the results:
{{{
>>> from django.core.cache import cache
>>> cache.clear()
>>> cache.get('testing_yo')
>>> cache.set('testing_yo', 'testing, yo!', 300)
>>> cache.key_prefix
'lendle_'
>>>
>>> # Using Django's cache framework's get method - THIS IS THE REAL ISSUE
>>> cache.get('testing_yo')
>>>
>>> # Using the underlying memcached instance - THIS IS JUST HERE TO GIVE
MORE INFO
>>> cache._cache.get('testing_yo')
'testing, yo!'
>>> cache._cache.get('%stesting_yo' % cache.key_prefix)
>>> cache._cache.get('%s:1:testing_yo' % cache.key_prefix)
}}}
However, it DOES seem to work if I use get_cache() directly:
{{{
>>> from django.core.cache import cache
>>> mycache = get_cache('default')
>>> mycache.clear()
>>> mycache.get('testing_yo')
>>> mycache.set('testing_yo', 'testing, yo!', 300)
>>> mycache.key_prefix
'lendle_'
>>>
>>> # Using Django's cache framework's get method - THIS IS THE REAL ISSUE
>>> mycache.get('testing_yo')
'testing, yo!'
>>>
>>> # Using the underlying memcached instance - THIS IS JUST HERE TO GIVE
MORE INFO
>>> mycache._cache.get('testing_yo')
>>> mycache._cache.get('%stesting_yo' % cache.key_prefix)
>>> mycache._cache.get('%s:1:testing_yo' % cache.key_prefix)
'testing, yo!'
}}}
And if I use a manually instantiated cache object:
{{{
>>> from django.core.cache.backends.memcached import MemcachedCache
>>> mycache = MemcachedCache('127.0.0.1:11211', {'KEY_PREFIX': 'lendle_'})
>>> mycache.clear()
>>> mycache.get('testing_yo')
>>> mycache.set('testing_yo', 'testing, yo!', 300)
>>> mycache.key_prefix
'lendle_'
>>>
>>> # Using Django's cache framework's get method - THIS IS THE REAL ISSUE
>>> mycache.get('testing_yo')
'testing, yo!'
>>>
>>> # Using the underlying memcached instance - THIS IS JUST HERE TO GIVE
MORE INFO
>>> mycache._cache.get('testing_yo')
>>> mycache._cache.get('%stesting_yo' % cache.key_prefix)
>>> mycache._cache.get('%s:1:testing_yo' % cache.key_prefix)
'testing, yo!'
}}}
PROGRESS!
--
Ticket URL: <http://code.djangoproject.com/ticket/15149#comment:11>
Django <http://code.djangoproject.com/>
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