JackyYangPassion commented on issue #4400: what is the difference between Pinot and Druid URL: https://github.com/apache/incubator-pinot/issues/4400#issuecomment-509469809 Firstly :thank you for your attention! I agree with that Druid supports two modes Push (Tranquility) and Pull (Kafka Indexing Service) ;But Kafka Indexing Service also support exactly once semantics. I am very interested in Pinot star-tree index
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