Hi Richard, I'm still not 100% sure, but my first guess is that it might be because of datastore tablets splitting/merging behavior. When you create or delete lots of entities, the datastore tablets might be splited/merged into larger/fewer number of tablets. If that happens, you may experience such high latencies.
This blog post by Ikai explains this issue very well: http://ikaisays.com/2011/01/25/app-engine-datastore-tip-monotonically-increasing-values-are-bad/ Questions are: How often those entities are created? How much QPS? What kind of keys do you use for those small entities? If you write entities at a somewhat high rate like >100QPS, and you're using keys which are not distributed well, the culprit might be splitting/merging behavior mentioned above. Also, maybe you can consider using pull queues for such tasks. -- Takashi On Tue, Jul 31, 2012 at 4:04 AM, Richard <[email protected]> wrote: > And, of course.... including an image from Google docs does not actually > work. Grrr! > > https://docs.google.com/drawings/pub?id=1nbrpRb7bSYIvS7329fY2jmynKCJOtUtlCMImo0wXnpE&w=1440&h=1080 > > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/google-appengine/-/tGsoCfpFC_kJ. > > 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. -- Takashi Matsuo -- 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.
