Caching using Memcached and python-memcache

Question

I installed them both, but i get a None every time i try to get some key

>>from django.core.cache import cache #no errors
>>cache.set('value1','value2',39) #no errors
>>cache.get('value1') #no errors but no value either

in settings.py i got

CACHES = {
'default':{
    'BACKEND':'django.core.cache.backends.memcached.MemcachedCache',
    'LOCATION':'127.0.0.1:1991',
    'TIMEOUT': 1200,
    }
}

what is going on wrong? I don't have even the slightest idea what to debug or where to start ...

You say you installed them both. Is the memcached server running? — Chris Hawkes
– Chris Hawkes, Commented Sep 9, 2014 at 12:12
bah dum tsssssss! How to start it on my dev machine ? Was not in the docs! — Martin Spasov
– Martin Spasov, Commented Sep 9, 2014 at 12:20

mhawke · Accepted Answer · 2014-09-09 12:29:33Z

1

Are you sure that memcached is actually running, and that it is configured to listen on 127.0.0.1 port 1991? By default memcached listens on port 11211.

django.core.cache.cache plays dumb when memcache fails to store keys, it doesn't raise an exception or return any error.

You can test more directly with memcache like this:

import memcache

for port in (1991, 11211):
    print "Testing memcached on port %d" % port
    mc = memcache.Client(['127.0.0.1:%d' % port])

    if mc.set('value1', 'value2'):
        print "stored key value pair"
        if mc.get('value1') == 'value2':
            print "successfully retrieved value"
            break
        else:
            print "Failed to retrieve value"
    else:
        print "Failed to store key value pair"

answered Sep 9, 2014 at 12:29

mhawke

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2 Comments

Martin Spasov Over a year ago

like i said in my other comment, how to start the memcache server on my dev machine? plus how to configure it to the different port?

mhawke Over a year ago

man memcached? Simply memcached will start it up listening on port 11211 on all interfaces on the local machine. Use memcached -p 1991 to use port 1991. Add the -vv option to see lots of logging.

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