Quite simply wont work. It might appear to work for a while, but it will soon break.
AppEngine is distributed, and runs on many machines. You can cache global variables between requests. But its just a bonus cache, cant store data there. Each request might hit a different instance, instances will be flushed without warning, and there is strong evidence that cron jobs hit different instances to ones serving web visitors anyway. Memcache will give more persistance, (ie less likly the data disappear on you) - but even that can be flushed or become unavailable. Again its just a cache - not for data. If you want to store the data have to use the datastore. Fundermentally, writing in 'batches' like you propose is not going to save much, because the same datastore API calls are still going to have to be made, just there can be some optimization as the task is similar. It might save some tho because the index writes can be batched. On 16/09/2009, Prashant <[email protected]> wrote: > hi, > > my app needs to store some data to datastore for each & every request, say 1 > object per request which causes high cpu usage per request. to minimize the > cpu usage per request, instead of adding the object directly to datastore i > add the object to a LinkedList (every request) and use a cron which moves > objects form the LinkedList to datastrore periodically, say every min. > > I feel it is not a good practice. I don't want to use memcache (instead of > server ram) to store my LinkedList because delay in fetching and storing the > list form/to memcache may cause loss of data from upcomming requests (or > previous request). I don't want to use task queue either for some reasons. > > Experts please comment on this kind of implementation. Losses & Benefits, > any alternative good practice. > > Thanks. > > > > -- Barry - www.nearby.org.uk - www.geograph.org.uk - --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
