#10016: Cache middleware with memcached can't handle long URLs
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Reporter: jacob | Owner: nobody
Status: new | Milestone:
Component: Cache system | Version: 1.0
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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Memcached has a hard limit of 250 characters for cache keys
([http://code.sixapart.com/svn/memcached/trunk/server/doc/protocol.txt
cite]). However, cache keys for the cache middleware (and associated view
decorators) are of the form
{{{
'views.decorators.cache.cache_page.%s.%s.%s' % (key_prefix,
request.path, headers_hash)
}}}
([http://code.djangoproject.com/browser/django/trunk/django/utils/cache.py#L146
cite])
This means that if the combined length of
{{{settings.CACHE_MIDDLEWARE_KEY_PREFIX}}} and {{{request.path}}} is over
about 180 characters, you'll get failures. With cmemcache you get obscure
server errors; the pure-Python memcached client throws
{{{MemcachedKeyLengthError}}}.
--
Ticket URL: <http://code.djangoproject.com/ticket/10016>
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