junrao commented on code in PR #18727:
URL: https://github.com/apache/kafka/pull/18727#discussion_r1938309781


##########
clients/src/main/java/org/apache/kafka/common/protocol/ApiKeys.java:
##########
@@ -264,8 +269,11 @@ 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) {

Review Comment:
   Since listenerType is optional, could we add a comment when the caller is 
expected to pass in the right listenerType?



##########
core/src/test/scala/unit/kafka/network/ProcessorTest.scala:
##########
@@ -65,13 +65,31 @@ class ProcessorTest {
   @Test
   def testParseRequestHeaderWithUnsupportedApiVersion(): Unit = {
     val requestHeader = RequestTestUtils.serializeRequestHeader(
-      new RequestHeader(ApiKeys.PRODUCE, 0, "clientid", 0))
+      new RequestHeader(ApiKeys.FETCH, 0, "clientid", 0))
     val apiVersionManager = new SimpleApiVersionManager(ListenerType.BROKER, 
true,
       () => new FinalizedFeatures(MetadataVersion.latestTesting(), 
Collections.emptyMap[String, java.lang.Short], 0))
     val e = assertThrows(classOf[UnsupportedVersionException],
       (() => Processor.parseRequestHeader(apiVersionManager, requestHeader)): 
Executable,
-      "PRODUCE v0 should throw UnsupportedVersionException exception")
+      "FETCH v0 should throw UnsupportedVersionException exception")
     assertTrue(e.toString.contains("unsupported version"));
   }
 
+  /**
+   * We do something unusual with these versions of produce, and we want to 
make sure we don't regress.
+   * See `ApiKeys.PRODUCE_API_VERSIONS_RESPONSE_MIN_VERSION` for details.
+   */
+  @Test
+  def testParseRequestHeaderForProduceV0ToV2(): Unit = {
+    for (version <- 0 to 2) {
+      val requestHeader = RequestTestUtils.serializeRequestHeader(
+        new RequestHeader(ApiKeys.PRODUCE, version.toShort, "clientid", 0))
+      val apiVersionManager = new SimpleApiVersionManager(ListenerType.BROKER, 
true,

Review Comment:
   This is an existing issue. Broker uses `DefaultApiVersionManager`, instead 
of `SimpleApiVersionManager`. It would be useful to switch to 
`DefaultApiVersionManager` here and in 
`testParseRequestHeaderWithUnsupportedApiVersion()`.



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