[jira] [Created] (KAFKA-6273) Allow names for windowing joins

["Matthias (JIRA)" <ji...@apache.org>]

Matthias created KAFKA-6273:
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             Summary: Allow names for windowing joins
                 Key: KAFKA-6273
                 URL: https://issues.apache.org/jira/browse/KAFKA-6273
             Project: Kafka
          Issue Type: Improvement
            Reporter: Matthias


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.)




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