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

["Yeva Byzek (JIRA)" <ji...@apache.org>]

Yeva Byzek created KAFKA-5245:
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             Summary: 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: 0.10.2.1, 0.10.2.0
            Reporter: Yeva Byzek
            Priority: Minor


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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