Andrew, I am not sure I understand. We have built several analytics applications. We typically use custom aggregations as they are not available directly in the library.
-mohan On 4/28/21, 12:12 PM, "Andrew Otto" <o...@wikimedia.org> wrote: I'd assume this is because Kafka Streams is positioned for building streaming applications, rather than doing analytics, whereas Spark is more often used for analytics purposes.