lct45 commented on a change in pull request #10813:
URL: https://github.com/apache/kafka/pull/10813#discussion_r661675545



##########
File path: streams/src/main/java/org/apache/kafka/streams/StreamsConfig.java
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@@ -1426,6 +1425,9 @@ private void verifyMaxInFlightRequestPerConnection(final 
Object maxInFlightReque
     public Serde defaultKeySerde() {
         final Object keySerdeConfigSetting = 
get(DEFAULT_KEY_SERDE_CLASS_CONFIG);
         try {
+            if (keySerdeConfigSetting ==  null) {
+                return null;

Review comment:
       I don't think we want to, this is called when we create the 
`AbstractProcessorContext` which happens before we actually set the serdes. 
Since we don't check the configs and actually set the serde till later, I don't 
think we want to throw an exception here




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