Traditionally, collections of data are stored and processed in a single datacenter. As the volume of data grows at a tremendous rate, it is less efficient for only one data center to handle such large volumes of data from a performance point of view. Large cloud service providers are deploying datac enters geographically around the world for better performance and availability. A widely used approach for analytics of geo-distributed data is the centralized approach, which aggregates all the raw data from local data centers to a central data center.
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