Hi,
I'm experiencing some rather strange behavior from memcache. I think
I'm getting different data back from memcache using the same key
The issue I see is that when putting load on our application, even
simple memcache queries are starting to return inconsistant data. When
running the same request from multiple threads, I get different
results.
I've made a very simple example, that runs fine on 1-200 threads, but
if I put load on the app (with some heavier requests) just before I
run my test, I see different values coming back from memcache using
the same keys.
def get_new_memcahce_value(key, old_value):
old_val = memcache.get(key)
new_val = uuid.uuid4().get_hex()
reply = 'good'
if old_val and old_value != "":
if old_val != old_value:
reply = 'fail'
new_val = old_value
else:
if not memcache.set(key, new_val):
reply = 'set_fail'
else:
reply = 'new'
if not memcache.set(key,new_val):
reply = 'set_fail'
return (new_value, reply)
and from a server posting requests:
def request_loop(id):
key = "test:key_%d" % id
val, reply = get_new_memcahce_value(key, "")
for i in range(20):
val,reply = get_new_memcahce_value(key, val)
Is memcache working localy on a cluster of servers, and if an
application is spawned over more clusters, memcache will not
propergate data to the other clusters?
I hope someone can clarify this, since I can't find any post regarding
this issue.
Is there some way to get the application instance ID, so I can do some
more investigation on the subject?
Thanks
Kim
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