[jira] [Commented] (KAFKA-6182) Automatic co-partitioning of topics via automatic intermediate topic with matching partitions

["Antony Stubbs (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-6182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17110137#comment-17110137 ] 

Antony Stubbs commented on KAFKA-6182:
--------------------------------------

Ah yes that makes sense. Assuming the exception thrown when the partition mismatch is found at runtime would cause the entire system to fail fast, I think yes, this repartition operation solves the issue.

> 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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