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Matthias J. Sax commented on KAFKA-9559: ---------------------------------------- Thanks for looking into the code – I think a corresponding refactoring would still be simpler than adding checks all over the place... And I feel very strong about having a check and throw an informative exception. [~lct45] the refactoring might be tricky so I would propose to do multiple PR for the refactoring upfront, before we do the actual PR to set default to `null` and add the check. > Change the default "default serde" from ByteArraySerde to null > -------------------------------------------------------------- > > Key: KAFKA-9559 > URL: https://issues.apache.org/jira/browse/KAFKA-9559 > Project: Kafka > Issue Type: Improvement > Components: streams > Reporter: A. Sophie Blee-Goldman > Assignee: Leah Thomas > Priority: Blocker > Fix For: 3.0.0 > > > The current default "default serde" is not particularly useful, and in almost > all cases is intended to be overwritten either by setting the config > explicitly or by specifying serdes directly in the topology. If a user does > not set the config and misses specifying a serde they will get a runtime > ClassCastException once they start processing unless they are in fact > processing only bytes. > We should change the default default to null, so that an exception will > instead be thrown immediately on startup if a user failed to specify a serde > somewhere in their topology and it falls back to the unset default. > -- This message was sent by Atlassian Jira (v8.3.4#803005)