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Posted to jira@kafka.apache.org by "Robin Moffatt (JIRA)" <ji...@apache.org> on 2018/10/11 10:23:00 UTC

[jira] [Created] (KAFKA-7497) Kafka Streams should support self-join on streams

Robin Moffatt created KAFKA-7497:
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             Summary: Kafka Streams should support self-join on streams
                 Key: KAFKA-7497
                 URL: https://issues.apache.org/jira/browse/KAFKA-7497
             Project: Kafka
          Issue Type: Bug
            Reporter: Robin Moffatt


ref [https://github.com/confluentinc/ksql/issues/2030]

 

There are valid reasons to want to join a stream to itself, but Kafka Streams does not currently support this ({{Invalid topology: Topic foo has already been registered by another source.}}).  To perform the join requires creating a second stream as a clone of the first, and then doing a join between the two. This is a clunky workaround and results in unnecessary duplication of data.



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