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Matthias J. Sax resolved KAFKA-5581. ------------------------------------ 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} -- This message was sent by Atlassian Jira (v8.3.4#803005)