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https://issues.apache.org/jira/browse/KAFKA-8318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17521866#comment-17521866
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Matthias J. Sax commented on KAFKA-8318:
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It seem [~ipasynkov] does no work on this any longer. Feel free to pickup this
ticket if you are interested to provide a fix.
> 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
> Assignee: Ilia Pasynkov
> Priority: Minor
> Labels: newbie++
>
> 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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