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https://issues.apache.org/jira/browse/KAFKA-13345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax reassigned KAFKA-13345:
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Assignee: Matthias J. Sax
> WindowStore should use "delete" policy when duplicates are enabled
> ------------------------------------------------------------------
>
> Key: KAFKA-13345
> URL: https://issues.apache.org/jira/browse/KAFKA-13345
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Minor
>
> For stream-stream join, windowed stores are configures to retain duplicates.
> For this case, each key written into the store is unique.
> At the same time, windowed store changelog topics are configured with cleanup
> policy "delete,compact" by default. However, with retained duplicates, and
> thus effectively unique keys, log compaction does not make sense.
> To avoid keeping the broker log compaction thread busy without doing actual
> useful work for those topics, we should change the topic config to "delete"
> if duplicates are retained.
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