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Posted to dev@kafka.apache.org by "John Roesler (JIRA)" <ji...@apache.org> on 2019/05/03 14:40:00 UTC

[jira] [Created] (KAFKA-8318) Session Window Aggregations generate an extra tombstone

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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