id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
15655	(pylibmc) cache.set() hangs	fahhem	nobody	"My setup is a localhost memcached server on the default port:

{{{
CACHES = {
    'default': {
        'BACKEND':'django.core.cache.backends.memcached.PyLibMCCache',
        'LOCATION':'127.0.0.1:11211',
    }
}
}}}

When the backend changes to MemcachedCache, the problem goes away so this is definitely pylibmc. I did this exact setup on two different projects and two separate machines over the span of the last two weeks and I ran into this same problem both times:

When using cache.set(key,value,timeout), some keys will hang the thread/process when served through Apache (v2.2.16-1ubuntu3.1). When using ./manage.py runserver or runserver_plus, cache.set() works and when I switch from runserver to apache it works fine because cache.get() gets the value and no cache.set() is called. When the timeout passes, apache again hangs at the same cache.set(). I used a ton of logging.error() calls to find where apache hangs.

This machine is Ubuntu but the first machine with the problem was a Debian machine, both are running mostly stable, with a few non-critical packages from testing. Both run python2.6 and django 1.3, the first machine was 1.3-beta-1, this one had the problem in both beta and rc.

"		closed	Core (Cache system)	1.3-rc		invalid	pylibmc		Unreviewed	0	0	0	0	0	0