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

["Rohit Verma (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-7497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17552538#comment-17552538 ] 

Rohit Verma commented on KAFKA-7497:
------------------------------------

In fact, our use case is also for multiple events on the same topic [https://www.confluent.io/blog/multiple-event-types-in-the-same-kafka-topic/.|https://www.confluent.io/blog/multiple-event-types-in-the-same-kafka-topic/] As suggested in the example if I push Customer and Order events in the same topic/partition I want to do a self join to get customerOrders too.

> 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.



--
This message was sent by Atlassian Jira
(v8.20.7#820007)