if you create an entity with the same key as an existing entity, e.g. you do Foo(key_name='bar').put() in one request, then you do the same thing in another request, the second put() will overwrite the first.
if this happens in two concurrent transactions and they collide, one of the transactions will retry and do its put() again, overwriting the first one. if the put()s are outside transactions, it's much less likely that they'll collide. it's still possible that the datastore could attempt to perform those writes at the same time, but it's much less likely. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
