divijvaidya commented on code in PR #12010:
URL: https://github.com/apache/kafka/pull/12010#discussion_r854178031


##########
clients/src/main/java/org/apache/kafka/clients/producer/ProducerConfig.java:
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@@ -393,10 +394,14 @@ public class ProducerConfig extends AbstractConfig {
                                         
MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION_DOC)
                                 .define(KEY_SERIALIZER_CLASS_CONFIG,
                                         Type.CLASS,
+                                        ConfigDef.NO_DEFAULT_VALUE,
+                                        new ConfigDef.NonNullValidator(),

Review Comment:
   Never mind. I posted async and didn't read the conversation above. 
   > It might be alright to keep this. What do you think?
   
   I agree as long as we call out this change explicitly in the release notes 
as a change that could potentially require application code change in certain 
scenarios.



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