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Posted to jira@kafka.apache.org by "Ilia Pasynkov (Jira)" <ji...@apache.org> on 2020/09/23 15:08:00 UTC

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

    [ https://issues.apache.org/jira/browse/KAFKA-8318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17200880#comment-17200880 ] 

Ilia Pasynkov commented on KAFKA-8318:
--------------------------------------

Hello, can I pick this issue?

> 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
>            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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