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https://issues.apache.org/jira/browse/KAFKA-6035?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Yu reassigned KAFKA-6035:
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Assignee: Richard Yu
> Avoid creating changelog topics for state stores that are directly piped to a
> sink topic
> ----------------------------------------------------------------------------------------
>
> Key: KAFKA-6035
> URL: https://issues.apache.org/jira/browse/KAFKA-6035
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Reporter: Guozhang Wang
> Assignee: Richard Yu
> Priority: Major
>
> Today Streams make all state stores to be backed by a changelog topic by
> default unless users overrides it by {{disableLogging}} when creating the
> state store / materializing the KTable. However there are a few cases where a
> separate changelog topic would not be required as we can re-use an existing
> topic for that. This ticket summarize a specific issue that can be optimized:
> Consider the case when a KTable is materialized and then sent directly into a
> sink topic with the same key, e.g.
> {code}
> table1 = stream.groupBy(...).aggregate("state1").to("topic2");
> {code}
> Then we do not need to create a {{state1-changelog}} but can just use
> {{topic2}} as its changelog.
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