IMHO the right way depends on the number of items you have to process. :) If the number is not very big, a simple solution is to create 2 servlet (or one with a parameter). S1 - enqueue all the emails. Iterates through your entities and enqueue one task per each email (N email --> N task). Important: enque tasks using the "bulk" enqueue (max 100 task / call). S2 - send the email
S1 is called by your CRON S2 is called by Task Queue Important: set the queue rate accordingly to your quota limit. If you have not billing enabled, set <rate>5/m</rate> and <bucket-size>1<bucket-size>. So you will not exceed the quota limit (8 recipients/minute). Fabrizio On Fri, Jan 21, 2011 at 6:59 PM, Mayumi Liyanage < mayumi.liyan...@coldwin.com> wrote: > Hi, I need to iterate over all the entities in the Datastore and send > out emails once a day asynchronously to the actual app. > Usual way to do this would be to invoke a Servlet using cron which > would iterate over all the entities to send emails out. However, our > data is growing at the rapid rate and sooner or later we will have a > issue with 30 sec limit problem. > What would be the best way to do this operation using app engine > without worrying about 30 sec limit? > > Can we do above using the Mapper API? If so how can we invoke a mapper > from the servlet? > > Thanks. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-java@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
