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Posted to dev@kafka.apache.org by "Matthias J. Sax (JIRA)" <ji...@apache.org> on 2018/09/30 18:42:00 UTC
[jira] [Resolved] (KAFKA-6273) Allow names for windowing joins
[ https://issues.apache.org/jira/browse/KAFKA-6273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias J. Sax resolved KAFKA-6273.
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Resolution: Duplicate
> 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
> Priority: Major
> 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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