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From "Evgeny Veretennikov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5245) KStream builder should capture serdes
Date Tue, 13 Jun 2017 14:01:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16047933#comment-16047933
] 

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

Matthias, thanks for explanation! How can I self-assign this ticket? Seems like current assigner
[~anukin] isn't active here...

> 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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