Map Reduce over App Engine

App Engine Datastore is a NoSql that need to be scalable. To achieve scalability it has lots of limitations that generally push you towards duplication of data. As a consequence you need a good tool to manage, move, manipulate and transform your data into something that is easy to manage for your app. Map Reduce give you a tool to abstract all the details and problems of doing this kind of operations and give you the freedom to focus only on your application logic.

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