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Posted to jira@kafka.apache.org by "Matthias J. Sax (Jira)" <ji...@apache.org> on 2023/05/23 11:10:00 UTC

[jira] [Commented] (KAFKA-7497) Kafka Streams should support self-join on streams

    [ https://issues.apache.org/jira/browse/KAFKA-7497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17725357#comment-17725357 ] 

Matthias J. Sax commented on KAFKA-7497:
----------------------------------------

Seems to be fixed. Cf https://issues.apache.org/jira/browse/KAFKA-14209 

> Kafka Streams should support self-join on streams
> -------------------------------------------------
>
>                 Key: KAFKA-7497
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7497
>             Project: Kafka
>          Issue Type: New Feature
>          Components: streams
>            Reporter: Robin Moffatt
>            Priority: Major
>              Labels: needs-kip
>
> There are valid reasons to want to join a stream to itself, but Kafka Streams does not currently support this ({{Invalid topology: Topic foo has already been registered by another source.}}).  To perform the join requires creating a second stream as a clone of the first, and then doing a join between the two. This is a clunky workaround and results in unnecessary duplication of data.



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