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https://issues.apache.org/jira/browse/KAFKA-6182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax resolved KAFKA-6182.
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Resolution: Fixed
KIP-221 is implemented now. Closing this ticket.
> Automatic co-partitioning of topics via automatic intermediate topic with
> matching partitions
> ---------------------------------------------------------------------------------------------
>
> Key: KAFKA-6182
> URL: https://issues.apache.org/jira/browse/KAFKA-6182
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Affects Versions: 1.0.0
> Reporter: Antony Stubbs
> Priority: Major
>
> Currently it is up to the user to ensure that two input topics for a join
> have the same number of partitions, and if they don't, manually create an
> intermediate topic, and send the stream #through that topic first, and then
> performing the join.
> It would be great to have Kafka streams detect this and at least give the
> user the option to create an intermediate topic automatically with the same
> number of partitions as the topic being joined with.
> See
> https://docs.confluent.io/current/streams/developer-guide.html#joins-require-co-partitioning-of-the-input-data
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