The reason for reading is, they are the city names in INDIA and i need to display all the city names for each client. each entity has only two properties -cityname, cityid - but there are 6500 entities.
i am not able to find any solution for this situation. What i am planning to do is, Read them once and put in an Arraylist object and share this object everywhere. But how can i create one such arraylist object which lives forever and can be shared across all instances. Pls suggest. Thanks Deepak On Tue, Nov 22, 2011 at 1:09 AM, Brandon Wirtz <[email protected]> wrote: > If you are reading 6500 rows every request you are doing something wrong. > Why would you possibly need that much data?**** > > ** ** > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Deepak Singh > *Sent:* Monday, November 21, 2011 6:59 AM > *To:* [email protected] > *Subject:* Re: [google-appengine] Memcache doesn't work**** > > ** ** > > My application while on loading makes a read operation around 6500 rows > which is fixed for app. I have set memcache for this feature with cache > expiration to 8 days. Bu i observe that cache usually fails 5 to 6 times in > day, so in that case my app has datastore read of around 6500 rows. Thus my > app heavily uses datastore read quota whic is very costly to me.**** > > ** ** > > I have been unable to make cache available for 8 days or even working > properly.**** > > ** ** > > It would be great if you can let me know how to optmize this cache > properly.**** > > ** ** > > Thanks**** > > Deepak**** > > On Mon, Nov 21, 2011 at 4:14 AM, Brandon Wirtz <[email protected]> > wrote:**** > > Memcache is just a cache. Your values have no guarantee of being there even > 1micro second after you did the write. > > If you post your code we might be able to help, but I assure you Memcache > does work. > > My app does reads from the datastore or memcache for every request, > sometimes to for initialization of variables... like Who am I, Why am I > here, what configuration am I in. And then to serve the request... > > We use a combination of instance memory and memcache to not have to talk to > the data store. Datastore reads are "slow" compared to Instance Memory and > Memcache. > > Datastore Write Operations 0.24 Million Ops 0.19 > $1.00/ Million Ops $0.19 > Datastore Read Operations 0.02 Million Ops 0.00 > $0.70/ Million Ops $0.00 > > > I didn't count the "reads in my app" to the "writes" but I know I do reads > for initialization every time, and reads for data every time. I only do > writes on some requests... So I am going to be conservative and say that > I > do 3x as many reads as writes in my code, but so far today I have hit the > Datastore with a write 10x as many times as I have a read. That works out > to my local memory and memcache saving me 97% of the time. > > I don't have an easy way to tell you how much of the time that is instance > memory and how many times it is memcache, but I assure you it works. > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Jamil Rzayev > Sent: Sunday, November 20, 2011 1:48 PM > To: Google App Engine > Subject: [google-appengine] Memcache doesn't work**** > > > Hi. > > I have to use memcache to store some values frequently accessible by > application I am working on. > The Google App Engine Memcache doesn't work as it apparently removes values > after a couple of minutes I store it at memcache. > > I really need any idea and would highly appreciate for any comments. > I have already tried to ask here, but got response that I need to store > values as soon as I read them and didn't work. > > I am still losing my values... > > -- > 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. > > > -- > 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.**** > > > > **** > > ** ** > > -- > Deepak Singh**** > > -- > 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.**** > > -- > 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. > -- Deepak Singh -- 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.
