John Roesler created KAFKA-8318:
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Summary: Session Window Aggregations generate an extra tombstone
Key: KAFKA-8318
URL: https://issues.apache.org/jira/browse/KAFKA-8318
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: John Roesler
See the discussion
https://github.com/apache/kafka/pull/6654#discussion_r280231439
The session merging logic generates a tombstone in addition to an update when
the session window already exists. It's not a correctness issue, just a small
performance hit, because that tombstone is immediately invalidated by the
update.
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