As I know MapReduce rely on a relative large number of instances (on top of the normal traffic) to perform the calculation efficiently in parallel. Under the new pricing model each instance will cost you 15min idle time after the job is done. Therefore 15min times n instances are wasted (cost you without using them). If n=8 (for a relatively small and slow task), there will be an additional cost of $0.16 just for one MapReduce operation. It will be very costly if you are doing sth like hourly job like reporting. 8 instances will cost you $115.2/month for hourly MapReduce task, which is *in additional* to the cost of the actual run time, just for MapReduce tasks.
My question is, is it still a flexible mechanism on AppEngine? Or we should rely on external service to do these kind of calculation? (complex but could be more cost effective?) -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
