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https://issues.apache.org/jira/browse/KAFKA-4830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894483#comment-15894483
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Marc Juchli commented on KAFKA-4830:
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I'd like to tackle this, but beforehand I have a question.
I see that your mentioned line of code is part of {{KeyValuePrinter}}, and now
I am unsure whether this was just an example.
If my understanding is correct, what was suggested with
{{KStream.print(KeyValueMapper<K, V, String>)}} is meant to be an extension of
{{KStream}} in order to let the user decide how the output of the K,V shall
look like. However, this rises my concerns as we wouldn't allow to set a
{{streamName}} with this function definition.
Therefore, my approach would be to extend KStream with {{void print(final
String streamName, final KeyValueMapper<K,V,String> mapper)}}.
Furthermore, as {{KStreamImpl.print}} creates an instance of `KeyValuePrinter`,
this class would have to be changed too accordingly. Or is that meant be left
open to the user?
> 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: 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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