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HBase table design for tracking state of a complex entity

I have a spark-streaming application, that is responsible for putting JSON data from many different platforms into one big entity. Data pieces can be identified as belonging to one entity by a well-distributed key, which is always present in each data piece. This entity is then supposed to be sent over to a visualization tool, as a whole, each time a change occurs. Since a change in this entity may come from different sources and we...