[jira] [Commented] (KAFKA-5245) KStream builder should capture serdes

["Evgeny Veretennikov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-5245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16045936#comment-16045936 ] 

Evgeny Veretennikov commented on KAFKA-5245:
--------------------------------------------

There is Kstream.groupByKey() method, which doesn't require serdes. I guess, this ticket should be just closed.

> KStream builder should capture serdes 
> --------------------------------------
>
>                 Key: KAFKA-5245
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5245
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>    Affects Versions: 0.10.2.0, 0.10.2.1
>            Reporter: Yeva Byzek
>            Assignee: anugrah
>            Priority: Minor
>              Labels: beginner, newbie
>
> Even if one specifies a serdes in `builder.stream`, later a call to `groupByKey` may require the serdes again if it differs from the configured streams app serdes. The preferred behavior is that if no serdes is provided to `groupByKey`, it should use whatever was provided in `builder.stream` and not what was in the app.
> From the current docs:
> “When to set explicit serdes: Variants of groupByKey exist to override the configured default serdes of your application, which you must do if the key and/or value types of the resulting KGroupedStream do not match the configured default serdes.”



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