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https://issues.apache.org/jira/browse/KAFKA-4772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15989106#comment-15989106
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Matthias J. Sax commented on KAFKA-4772:
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For {{KStream#peek()}} we don't need a user facing flag, because {{#peek()}}
will always send downstream. If you don't want to send anything downstream, you
would call `{{KStream#foreach()}}`.
> Exploit #peek to implement #print() and other methods
> -----------------------------------------------------
>
> Key: KAFKA-4772
> URL: https://issues.apache.org/jira/browse/KAFKA-4772
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Matthias J. Sax
> Assignee: james chien
> Priority: Minor
> Labels: beginner, newbie
>
> From: https://github.com/apache/kafka/pull/2493#pullrequestreview-22157555
> Things that I can think of:
> - print / writeAsTest can be a special impl of peek; KStreamPrint etc can be
> removed.
> - consider collapse KStreamPeek with KStreamForeach with a flag parameter
> indicating if the acted key-value pair should still be forwarded.
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