Thank you. I think that we will stay on master/slave version. Now storing one entity group (two entities) with many indexed properties and several composite indexes in master/slave datastore is at around 1500 cpu ms and average latency 300 ms. With 3 times more cost it will be at often over 1000ms average latency limit, not to mention problem of needed ancestors queries to present customer stored data in previous request. Maybe with next gen queries (I assume around may 2011 right before next IO) I will need smaller composite indexes and cost will be bearable.
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