Google AppEngine DataStore

https://developers.google.com/appengine/articles/datastore/overview

https://developers.google.com/appengine/docs/python/datastore/transactions#Python_Isolation_and_consistency

SNAPShot isolation: http://en.wikipedia.org/wiki/Snapshot_isolation

DataStore Code Lab: https://googcloudlabs.appspot.com/codelabexercise1.html

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