Matthias J. Sax created KAFKA-4619:
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Summary: Dissallow to output records with unknown keys in
TransformValues
Key: KAFKA-4619
URL: https://issues.apache.org/jira/browse/KAFKA-4619
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 0.10.1.1, 0.10.0.1, 0.10.0.0, 0.10.1.0
Reporter: Matthias J. Sax
Assignee: Matthias J. Sax
Fix For: 0.10.2.0
{{KStream#transformValues}} allows the user to return a new value in
{{punctuate}} and it also allows the user to return any new key value pair
using {{ProcesserContext#forward}}. For {{punctuate}} the key gets set to
{{null}} under the hood and for {{forward}} the user can put any new key they
want. However, Kafka Streams assumes that using {{transformValue}} does not
change the key -- thus, this assumption might not hold right now resulting
potentially incorrectly partitioned data.
Thus, it should not be possible to return any data in {{punctuate}} and
{{forward}} and we should raise an exception.
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