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Matthias J. Sax resolved KAFKA-3745. ------------------------------------ Resolution: Duplicate See https://cwiki.apache.org/confluence/display/KAFKA/KIP-149%3A+Enabling+key+access+in+ValueTransformer%2C+ValueMapper%2C+and+ValueJoiner > Consider adding join key to ValueJoiner interface > ------------------------------------------------- > > Key: KAFKA-3745 > URL: https://issues.apache.org/jira/browse/KAFKA-3745 > Project: Kafka > Issue Type: Improvement > Components: streams > Affects Versions: 0.10.0.0 > Reporter: Greg Fodor > Assignee: Jeyhun Karimov > Priority: Minor > Labels: api, needs-kip, newbie > > In working with Kafka Stream joining, it's sometimes the case that a join key > is not actually present in the values of the joins themselves (if, for > example, a previous transform generated an ephemeral join key.) In such > cases, the actual key of the join is not available in the ValueJoiner > implementation to be used to construct the final joined value. This can be > worked around by explicitly threading the join key into the value if needed, > but it seems like extending the interface to pass the join key along as well > would be helpful. -- This message was sent by Atlassian JIRA (v6.4.14#64029)