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https://issues.apache.org/jira/browse/KAFKA-6273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16267292#comment-16267292
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Matthias J. Sax commented on KAFKA-6273:
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Thanks for the JIRA. All public API changes require a KIP,
https://cwiki.apache.org/confluence/display/KAFKA/Kafka+Improvement+Proposals
> Allow names for windowing joins
> -------------------------------
>
> Key: KAFKA-6273
> URL: https://issues.apache.org/jira/browse/KAFKA-6273
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 1.0.0
> Reporter: Matthias
> Labels: needs-kip
>
> Currently, the internal name of a windowing join is generated at runtime
> using a counter to ensure uniqueness within a running topology.
> If a topology is changed and redeployed, different names can be generated for
> the same window. This can result in lost windowing state without intervention
> modifying offsets to re-consume the input topics.
> https://kafka.apache.org/10/javadoc/org/apache/kafka/streams/kstream/Joined.html
> The proposed change would be to add an optional configuration parameter
> "joinName" to Joined. If provided, this would be used by KStreamImpl to
> generate internal names when building a join. If not provided the existing
> name generation would be used. (Since this is an opt-in, optional parameter
> there would be no impact on existing code.)
> Let me know if this should be a KIP instead. The change would be something
> along [these lines|https://github.com/FundingCircle/kafka/pull/3/files].
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