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https://issues.apache.org/jira/browse/KAFKA-13602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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A. Sophie Blee-Goldman resolved KAFKA-13602.
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Resolution: Fixed
> Allow to broadcast a result record
> ----------------------------------
>
> Key: KAFKA-13602
> URL: https://issues.apache.org/jira/browse/KAFKA-13602
> Project: Kafka
> Issue Type: New Feature
> Components: streams
> Reporter: Matthias J. Sax
> Assignee: Sagar Rao
> Priority: Major
> Labels: kip, newbie++
> Fix For: 3.4.0
>
>
> From time to time, users ask how they can send a record to more than one
> partition in a sink topic. Currently, this is only possible by replicate the
> message N times before the sink and use a custom partitioner to write the N
> messages into the N different partitions.
> It might be worth to make this easier and add a new feature for it. There are
> multiple options:
> * extend `to()` / `addSink()` with a "broadcast" option/config
> * add `toAllPartitions()` / `addBroadcastSink()` methods
> * allow StreamPartitioner to return `-1` for "all partitions"
> * extend `StreamPartitioner` to allow returning more than one partition (ie
> a list/collection of integers instead of a single int)
> The first three options imply that a "full broadcast" is supported only, so
> it's less flexible. On the other hand, it's easier to use (especially the
> first two options are easy as they do not require to implement a custom
> partitioner).
> The last option would be most flexible and also allow for a "partial
> broadcast" (aka multi-cast) pattern. It might also be possible to combine two
> options, or maye even a totally different idea.
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