#15149: Memcached backend: possible issue with cache keys
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Reporter: j...@jeffcroft.com | Owner: nobody
Status: new | Milestone:
Component: Cache system | Version: SVN
Resolution: | Keywords: memcached
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Comment (by j...@jeffcroft.com):
Thanks for your help, Russell. Updating my trunk didn't help. So I applied
the path you provided, and got these results:
{{{
>>> from django.core.cache import cache
>>> cache.clear()
>>> cache.get('testing_yo')
get base key = testing_yo
get base version = None
get key = lendle_:1:testing_yo
get val = None
>>> 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')
get base key = testing_yo
get base version = None
get key = lendle_:1:testing_yo
get val = None
>>>
>>> # 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)
>>>
}}}
My cache settings are as follows:
{{{
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
'LOCATION': '127.0.0.1:11211',
'KEY_PREFIX': 'lendle_',
}
}
}}}
And the memcached -vv output is thus:
{{{
<28 new auto-negotiating client connection
28: Client using the ascii protocol
<28 flush_all
>28 OK
<28 connection closed.
<28 new auto-negotiating client connection
28: Client using the ascii protocol
<28 get lendle_:1:testing_yo
>28 END
<28 connection closed.
<28 new auto-negotiating client connection
28: Client using the ascii protocol
<28 set testing_yo 0 300 12
>28 STORED
<28 connection closed.
<28 new auto-negotiating client connection
28: Client using the ascii protocol
<28 get lendle_:1:testing_yo
>28 END
<28 connection closed.
<28 new auto-negotiating client connection
28: Client using the ascii protocol
<28 get testing_yo
>28 sending key testing_yo
>28 END
<28 connection closed.
<28 new auto-negotiating client connection
28: Client using the ascii protocol
<28 get lendle_testing_yo
>28 END
<28 connection closed.
<28 new auto-negotiating client connection
28: Client using the ascii protocol
<28 get lendle_:1:testing_yo
>28 END
<28 connection closed.
}}}
From all of this, it's clear to me that the cache is getting set with the
key "testing_yo", not "lendle_:1:testing_yo". But I can't, for the life of
me, figure out why.
Thanks again for all your help.
P.S. You'll notice that I switched projects, here -- from barstar to
lendle, but the results are the same, either way.
--
Ticket URL: <http://code.djangoproject.com/ticket/15149#comment:8>
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