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https://issues.apache.org/jira/browse/KAFKA-3209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15268959#comment-15268959
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Michael Graff commented on KAFKA-3209:
--------------------------------------

We have a use case which is in effect "take a single Kafka input message and 
produce 1 or more output items" -- I understand people refer to this as a 
"flatMap" or something like that.

Specifically, our use case is to get a chunk formatted like this:

Header-1: value1
Header-2: value2

record1
record2
record3
...
records

Our transformation is to take some header fields and merge them into a record, 
then emit that record for all (or some) records in the message.


> Support single message transforms in Kafka Connect
> --------------------------------------------------
>
>                 Key: KAFKA-3209
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3209
>             Project: Kafka
>          Issue Type: Improvement
>          Components: KafkaConnect
>            Reporter: Neha Narkhede
>
> Users should be able to perform light transformations on messages between a 
> connector and Kafka. This is needed because some transformations must be 
> performed before the data hits Kafka (e.g. filtering certain types of events 
> or PII filtering). It's also useful for very light, single-message 
> modifications that are easier to perform inline with the data import/export.



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