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https://issues.apache.org/jira/browse/KAFKA-5581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-5581.
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Resolution: Fixed
> Avoid creating changelog topics for state stores that are materialized from a
> source topic
> ------------------------------------------------------------------------------------------
>
> Key: KAFKA-5581
> URL: https://issues.apache.org/jira/browse/KAFKA-5581
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Reporter: Guozhang Wang
> Assignee: Jeyhun Karimov
> Priority: Major
> Labels: architecture, performance
>
> 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. A few examples:
> There are a few places where the materialized store do not need a separate
> changelog topic. This issue summarize a specific issue:
> 1) If a KTable is read directly from a source topic, and is materialized i.e.
> {code}
> table1 = builder.table("topic1", "store1")`.
> {code}
> In this case {{table1}}'s changelog topic can just be {{topic1}}, and we do
> not need to create a separate {{table1-changelog}} topic.
> 2) if a KStream is materialized for joins where the streams are directly from
> a topic, e.g.:
> {code}
> stream1 = builder.stream("topic1");
> stream2 = builder.stream("topic2");
> stream3 = stream1.join(stream2, windows); // stream1 and stream2 are
> materialized with a changelog topic
> {code}
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