ijuma commented on code in PR #18727:
URL: https://github.com/apache/kafka/pull/18727#discussion_r1938136022


##########
clients/src/main/java/org/apache/kafka/common/protocol/ApiKeys.java:
##########
@@ -264,8 +273,11 @@ public boolean hasValidVersion() {
         return oldestVersion() <= latestVersion();
     }
 
-    public Optional<ApiVersionsResponseData.ApiVersion> toApiVersion(boolean 
enableUnstableLastVersion) {
-        short oldestVersion = oldestVersion();
+    public Optional<ApiVersionsResponseData.ApiVersion> toApiVersion(boolean 
enableUnstableLastVersion,
+                                                                     
Optional<ApiMessageType.ListenerType> listenerType) {
+        // see `PRODUCE_MIN_VERSION` for details on why we do this
+        short oldestVersion = (this == PRODUCE && listenerType.map(l -> l == 
ApiMessageType.ListenerType.BROKER).orElse(false)) ?

Review Comment:
   We're discussing this in the main discussion, so will resolve this.



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