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https://issues.apache.org/jira/browse/KAFKA-7497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648105#comment-16648105
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Guozhang Wang commented on KAFKA-7497:
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[~mjsax] You're right, I was only thinking about the use cases that the stream
needs some enrichment that are independent of any other streams / tables; I
also agree with you that even with sliding window, it seems windowed
aggregations should be sufficient still.
[~rmoff] I looked at the use case, and it seems to be a better fit with
"session window" aggregations of KStream than using KStream self-join:
https://kafka.apache.org/20/javadoc/org/apache/kafka/streams/kstream/SessionWindows.html
> 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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