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Posted to dev@kafka.apache.org by "Matthias J. Sax (JIRA)" <ji...@apache.org> on 2017/01/10 01:06:58 UTC
[jira] [Updated] (KAFKA-4217) KStream.transform equivalent of
flatMap
[ https://issues.apache.org/jira/browse/KAFKA-4217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthias J. Sax updated KAFKA-4217:
-----------------------------------
Labels: api needs-kip newbie (was: api newbie)
> KStream.transform equivalent of flatMap
> ---------------------------------------
>
> Key: KAFKA-4217
> URL: https://issues.apache.org/jira/browse/KAFKA-4217
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 0.10.0.1
> Reporter: Elias Levy
> Labels: api, needs-kip, newbie
>
> {{KStream.transform}} gives you access to state stores while allowing you to return zero or one transformed {{KeyValue}}. Alas, it is unclear what method you should use if you want to access state stores and return zero or multiple {{KeyValue}}. Presumably you can use {{transform}}, always return {{null}}, and use {{ProcessorContext.forward}} to emit {{KeyValues}}.
> It may be good to introduce a {{transform}}-like {{flatMap}} equivalent, or allow store access from other {{KStream}} methods, such as {{flatMap}} itself.
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