These are good questions. I hope I am able to do justice to them with my answers. To elaborate little more on what @Sarath Subramanian said. Kafka is used to do the work of relaying the notifications from Hive to Atlas. Hive publishes to a topic and Atlas subscribes to that and thus receives the notifications. There has been some discussion on using Atlas for MySQL and Oracle. I have not seen any implementation yet. This is possible, provided these 2 products have notification mechanisms. From what I know, these have database change triggers that be used to call a REST API or push some message onto a queue or publish to Kafka. For Oracle, this is what i found. Hope this helps.
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