[jira] [Assigned] (KAFKA-6729) KTable should use user source topics if possible and not create changelog topic

["Matthias J. Sax (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax reassigned KAFKA-6729:
--------------------------------------

    Assignee: Guozhang Wang  (was: Bill Bejeck)

> KTable should use user source topics if possible and not create changelog topic
> -------------------------------------------------------------------------------
>
>                 Key: KAFKA-6729
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6729
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 1.0.0
>            Reporter: Matthias J. Sax
>            Assignee: Guozhang Wang
>            Priority: Blocker
>             Fix For: 2.0.0
>
>
> With KIP-182 we reworked Streams API largely and introduced a regression into 1.0 code base. If a KTable is populated from a source topic, ie, StreamsBuilder.table() -- the KTable does create its own changelog topic. However, in older releases (0.11 or older), we don't create a changelog topic but use the user specified source topic instead.
> We want to reintroduce this optimization to reduce the load (storage and write) on the broker side for this case.



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