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https://issues.apache.org/jira/browse/KAFKA-4830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894842#comment-15894842
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Guozhang Wang commented on KAFKA-4830:
--------------------------------------
[~mjuchli] As for this JIRA itself, the goal is to allow users to customize the
output format even with its own pass-in parameters instead of restricting with
{code}
"[" + this.streamName + "]: " + keyToPrint + " , " + valueToPrint
{code}
However the prefix of "[streamName]" will still be preserved. I.e. we can add a
new function in `KStream` as you mentioned. As for "KStreamPrinter", as
Matthias mentioned, it is better to first cleanup this class as an special impl
of `KStreamPeek` and then this special impl can be extended with a `mapper`
parameter to implement the above API.
> Augment KStream.print() to allow users pass in extra parameters in the
> printed string
> -------------------------------------------------------------------------------------
>
> Key: KAFKA-4830
> URL: https://issues.apache.org/jira/browse/KAFKA-4830
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Guozhang Wang
> Labels: needs-kip, newbie
>
> Today {{KStream.print}} use the hard-coded result string as:
> {code}
> "[" + this.streamName + "]: " + keyToPrint + " , " + valueToPrint
> {code}
> And some users are asking to augment this so that they can customize the
> output string as {{KStream.print(KeyValueMapper<K, V, String>)}} :
> {code}
> "[" + this.streamName + "]: " + mapper.apply(keyToPrint, valueToPrint)
> {code}
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