Question: How to get set, memcached listening on UDP only, using Python (any of the production level Python bindings)
What I have done/tried so far:
Making the memcached listen on UDP only - I specified the OPTIONS in memcached config:
OPTIONS="-p 0 -U 11211" # -U for UDP port and -p for TCP port
Verification:
# netstat -nlp|grep memcached
udp 0 0 0.0.0.0:11211 0.0.0.0:* 12095/memcached
udp6 0 0 :::11211 :::* 12095/memcached
The problem is, I didn't get to verify i.e. performing get and set or simply put I didn't get it to work.
I have looked into the Python memcache bindings- the 2 widely used ones (reliable, to be used in production) python-memcached and pylibmc.
For python-memcached I didn't find any explicit mention for specifying UPD only or any check if the memcached is listening on TCP or UDP.
For pylibmc, I though found a mention:
To specify UDP, the server address should be prefixed with "udp:", as in "udp:127.0.0.1"
To verify pylibmc:
>>> import pylibmc
>>> mc_tcp = pylibmc.Client(["127.0.0.1"], binary=True, behaviors={"tcp_nodelay": True, "ketama": True})
>>> mc_udp = pylibmc.Client(["udp:127.0.0.1"], binary=True, behaviors=None)
>>>
>>> mc_tcp.set('udp_key', 12)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
_pylibmc.ConnectionError: error 3 from memcached_set: CONNECTION FAILURE
>>>
>>> mc_udp.set('udp_key', 12)
True
>>>
>>> mc_udp.get('udp_key')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
_pylibmc.NotSupportedError: error 28 from memcached_get(udp_key): ACTION NOT SUPPORTED
To verify python-memcached:
>>> import memcache
>>> mc = memcache.Client([('127.0.0.1', 11211)])
>>> mc.set('key', 12)
0
>>> mc.get('key')
>>>
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