This is a typo:
for key in cached_mapping:
println(self, str(obj_map[key]))
Should be:
for key in cached_mapping:
println(self, str(cached_mapping[key]))
This is tested and working for me.
On Thu, Dec 3, 2009 at 12:04 PM, Ikai L (Google) <[email protected]> wrote:
> What is being returned by get_multi? None or empty dictionary? Is a
> namespace being specified?
>
> Here's some test code that is working for me when deployed. What might you
> be doing differently from this?
>
> from google.appengine.ext import webapp
> from google.appengine.ext.webapp.util import run_wsgi_app
> from google.appengine.ext import db
>
> from google.appengine.api import memcache
>
> class MyThing(db.Model):
> name = db.StringProperty()
>
> def __str__(self):
> return "MyThing: %s" % self.name
>
> class MemcacheTest(webapp.RequestHandler):
> def get(self):
> stats = memcache.get_stats()
>
> println(self, "<b>Cache Hits:%s</b><br>" % stats['hits'])
> println(self, "<b>Cache Misses:%s</b><br><br>" % stats['misses'])
>
> memcache.set("data", "My data")
> data = memcache.get("data")
> println(self, "Set 'data' -> 'My data'. Get 'data' -> " + data)
>
> key_range = range(1000)
> mapping = { }
>
> for i in key_range:
> mapping["key%d" % i] = "value %d" % i
>
> memcache.set_multi(mapping)
> println(self, "Set %d values using set_multi" % len(mapping))
>
> cached_mapping = memcache.get_multi(mapping.keys())
> println(self, "Retrieved %d values using get_multi" %
> len(cached_mapping))
>
> namespace = "synccache"
> println(self, "Testing namespaces with namespace '%s'" % namespace)
> memcache.set_multi(mapping, namespace=namespace)
> println(self, "Set %d values using set_multi in namespace '%s'" % (
> len(mapping), namespace ))
>
> cached_mapping = memcache.get_multi(mapping.keys(),
> namespace=namespace)
> println(self, "Retrieved %d values using get_multi in namespace '%s'" %
> ( len(cached_mapping), namespace ))
>
>
> println(self, "Testing objects")
> obj_map = {}
> for i in key_range:
> thing = MyThing(name="thing %d" % i)
> obj_map[thing.name] = thing
>
> namespace = "things"
> println(self, "Testing namespaces with namespace '%s'" % namespace)
> memcache.set_multi(obj_map, namespace=namespace)
> println(self, "Set %d values using set_multi in namespace '%s'" % (
> len(mapping), namespace ))
>
> cached_mapping = memcache.get_multi(obj_map.keys(),
> namespace=namespace)
> println(self, "Retrieved %d values using get_multi in namespace '%s'" %
> ( len(cached_mapping), namespace ))
>
> for key in cached_mapping:
> println(self, str(obj_map[key]))
>
> def println(handler, string):
> handler.response.out.write(string + "<br/>")
>
>
> application = webapp.WSGIApplication([ ('/cachetest', MemcacheTest),
> ], debug=True)
>
> def main():
> run_wsgi_app(application)
>
> if __name__ == "__main__":
> main()
>
>
> On Thu, Dec 3, 2009 at 11:09 AM, naan <[email protected]> wrote:
>
>> I'm using memcache.set_multi() / add_multi() for caching DataStore
>> data. Code is something like following:
>>
>>
>> users = User.all().query(....).fetch(...)
>>
>> mapping = {}
>> for u in users:
>> mapping[str(u.key())] = u
>>
>> memcache.set_multi(mapping, namespace='synccache')
>>
>>
>> It seems that set_multi/add_multi returns correct value and there's no
>> error logs, error messages, nor exception. However, I can't retrieve
>> them with memcache.get_multi().
>>
>> Thanks,
>> Kazuho
>>
>> On Dec 3, 10:46 am, "Ikai L (Google)" <[email protected]> wrote:
>> > We've just tried this and it seems to work for us. What are you storing
>> in
>> > Memcache? How are you generating the keys?
>> >
>> > On Thu, Dec 3, 2009 at 10:31 AM, Ikai L (Google) <[email protected]>
>> wrote:
>> >
>> >
>> >
>> > > Is there an error message when you try to store data? Do you see any
>> > > information in the logs?
>> >
>> > > On Wed, Dec 2, 2009 at 5:49 PM, naan <[email protected]> wrote:
>> >
>> > >> My app id is echofonsync and the issue remains. I can get a result
>> > >> from memcache.get_stats() now, but can not store new data. Thanks.
>> >
>> > >> On Dec 2, 5:05 pm, "Ikai L (Google)" <[email protected]> wrote:
>> > >> > Is this issue still occurring for you? If so, let me know your
>> > >> application
>> > >> > ID.
>> >
>> > >> > Michael, let me know if this is causing you problems in production.
>> I
>> > >> can
>> > >> > attempt to migrate your application to a different pool, but this
>> is not
>> > >> > something I'd advise if you're running in production and things are
>> > >> working
>> > >> > fine.
>> >
>> > >> > On Wed, Dec 2, 2009 at 4:26 PM, naan <[email protected]> wrote:
>> > >> > > Hi,
>> >
>> > >> > > This happens for me too. I can't store any data into memcache.
>> Also, I
>> > >> > > can't get any results with memcache.get_stats(). The function
>> returns
>> > >> > > None.
>> >
>> > >> > > On Dec 2, 1:45 pm, Michael <[email protected]> wrote:
>> > >> > > > The problem with consistency is: the same key maps to the
>> different
>> > >> > > > values (when I'm hitting another memcached server), so randomly
>> I'm
>> > >> > > > getting old value from memcache and it produces weird effects
>> on my
>> > >> > > > application (like new message appearing, though they were
>> marked as
>> > >> > > > read).
>> >
>> > >> > > > Is it going to be fixed soon?
>> >
>> > >> > > > On Dec 2, 11:33 pm, Michael <[email protected]> wrote:
>> >
>> > >> > > > > At the time of the first post it was going for about 10
>> minutes.
>> >
>> > >> > > > > It's still happening.
>> >
>> > >> > > --
>> >
>> > >> > > You received this message because you are subscribed to the
>> Google
>> > >> Groups
>> > >> > > "Google App Engine" group.
>> > >> > > To post to this group, send email to
>> > >> [email protected].
>> > >> > > To unsubscribe from this group, send email to
>> > >> > > [email protected]<google-appengine%[email protected]>
>> <google-appengine%[email protected]<google-appengine%[email protected]>
>> >
>> > >> <google-appengine%[email protected]<google-appengine%[email protected]>
>> <google-appengine%[email protected]<google-appengine%[email protected]>
>> >
>> >
>> > >> > > .
>> > >> > > For more options, visit this group at
>> > >> > >http://groups.google.com/group/google-appengine?hl=en.
>> >
>> > >> > --
>> > >> > Ikai Lan
>> > >> > Developer Programs Engineer, Google App Engine
>> >
>> > >> --
>> >
>> > >> You received this message because you are subscribed to the Google
>> Groups
>> > >> "Google App Engine" group.
>> > >> To post to this group, send email to
>> [email protected].
>> > >> To unsubscribe from this group, send email to
>> > >> [email protected]<google-appengine%[email protected]>
>> <google-appengine%[email protected]<google-appengine%[email protected]>
>> >
>> > >> .
>> > >> For more options, visit this group at
>> > >>http://groups.google.com/group/google-appengine?hl=en.
>> >
>> > > --
>> > > Ikai Lan
>> > > Developer Programs Engineer, Google App Engine
>> >
>> > --
>> > Ikai Lan
>> > Developer Programs Engineer, Google App Engine
>>
>> --
>>
>> You received this message because you are subscribed to the Google Groups
>> "Google App Engine" group.
>> To post to this group, send email to [email protected].
>> To unsubscribe from this group, send email to
>> [email protected]<google-appengine%[email protected]>
>> .
>> For more options, visit this group at
>> http://groups.google.com/group/google-appengine?hl=en.
>>
>>
>>
>
>
> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine
>
--
Ikai Lan
Developer Programs Engineer, Google App Engine
--
You received this message because you are subscribed to the Google Groups
"Google App Engine" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-appengine?hl=en.
