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https://issues.apache.org/jira/browse/KAFKA-16585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17839791#comment-17839791
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Stanislav Spiridonov commented on KAFKA-16585:
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If you check the example on 
[https://developer.confluent.io/tutorials/kafka-streams-schedule-operations/kstreams.html]
 you will see the same situation *transform* vs {*}transformValues{*}. 
{noformat}
I used transform in this tutorial as it makes for a better example because you 
can use the ProcessorContext.forward method.{noformat}

> No way to forward message from punctuation method in the FixedKeyProcessor
> --------------------------------------------------------------------------
>
>                 Key: KAFKA-16585
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16585
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 3.6.2
>            Reporter: Stanislav Spiridonov
>            Priority: Major
>
> The FixedKeyProcessorContext can forward only FixedKeyRecord. This class 
> doesn't have a public constructor and can be created based on existing 
> records. But such record usually is absent in the punctuation method.



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