chia7712 commented on code in PR #23401:
URL: https://github.com/apache/kafka/pull/23401#discussion_r4004142358


##########
server/src/test/java/org/apache/kafka/server/ApiVersionsRequestTest.java:
##########
@@ -0,0 +1,307 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.server;
+
+import org.apache.kafka.clients.NodeApiVersions;
+import org.apache.kafka.common.message.ApiMessageType;
+import org.apache.kafka.common.message.ApiVersionsRequestData;
+import org.apache.kafka.common.message.ApiVersionsResponseData;
+import org.apache.kafka.common.message.SaslHandshakeRequestData;
+import org.apache.kafka.common.network.ListenerName;
+import org.apache.kafka.common.protocol.ApiKeys;
+import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.requests.ApiVersionsRequest;
+import org.apache.kafka.common.requests.ApiVersionsResponse;
+import org.apache.kafka.common.requests.RequestHeader;
+import org.apache.kafka.common.requests.RequestUtils;
+import org.apache.kafka.common.requests.SaslHandshakeRequest;
+import org.apache.kafka.common.requests.SaslHandshakeResponse;
+import org.apache.kafka.common.security.auth.SecurityProtocol;
+import org.apache.kafka.common.test.ClusterInstance;
+import org.apache.kafka.common.test.api.ClusterConfigProperty;
+import org.apache.kafka.common.test.api.ClusterTest;
+import org.apache.kafka.common.test.api.Type;
+import org.apache.kafka.common.utils.Utils;
+import org.apache.kafka.common.utils.internals.AppInfoParser;
+import org.apache.kafka.server.common.EligibleLeaderReplicasVersion;
+import org.apache.kafka.server.common.GroupVersion;
+import org.apache.kafka.server.common.MetadataVersion;
+import org.apache.kafka.server.common.ShareVersion;
+import org.apache.kafka.server.common.StreamsVersion;
+import org.apache.kafka.server.common.TransactionVersion;
+import org.apache.kafka.test.TestUtils;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class ApiVersionsRequestTest {
+    private final ClusterInstance cluster;
+
+    public ApiVersionsRequestTest(ClusterInstance cluster) {
+        this.cluster = cluster;
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequest() throws IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), false, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"true"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequestIncludesUnreleasedApis() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), true, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testApiVersionsRequestThroughControllerListener() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.controllerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.controllerListenerName(), true, false, 
ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestWithUnsupportedVersion() throws 
IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
sendUnsupportedApiVersionRequest(apiVersionsRequest);
+        assertEquals(Errors.UNSUPPORTED_VERSION.code(), 
apiVersionsResponse.data().errorCode());
+        assertFalse(apiVersionsResponse.data().apiKeys().isEmpty());
+        ApiVersionsResponseData.ApiVersion apiVersion = 
apiVersionsResponse.data().apiKeys().find(ApiKeys.API_VERSIONS.id);
+        assertEquals(ApiKeys.API_VERSIONS.id, apiVersion.apiKey());
+        assertEquals(ApiKeys.API_VERSIONS.oldestVersion(), 
apiVersion.minVersion());
+        assertEquals(ApiKeys.API_VERSIONS.latestVersion(), 
apiVersion.maxVersion());
+    }
+
+    // Use the latest production MV for this test
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, metadataVersion = 
MetadataVersion.IBP_3_8_IV0, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "false"),
+    })
+    public void testApiVersionsRequestValidationV0() throws IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(
+            apiVersionsResponse,
+            cluster.clientListener(),
+            
!"false".equals(cluster.config().serverProperties().get("unstable.api.versions.enable")),
+            false,
+            (short) 0
+        );
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testApiVersionsRequestValidationV0ThroughControllerListener() 
throws IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.controllerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.controllerListenerName(), true, false, (short) 0);
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestValidationV3() throws IOException {
+        // Invalid request because Name and Version are empty by default
+        ApiVersionsRequest apiVersionsRequest = new ApiVersionsRequest(new 
ApiVersionsRequestData(), (short) 3);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        assertEquals(Errors.INVALID_REQUEST.code(), 
apiVersionsResponse.data().errorCode());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestMetadataClusterCheckPass() throws 
IOException {
+        ApiVersionsRequestData requestData = new ApiVersionsRequestData();
+        requestData.setClientSoftwareName("apache-kafka-java");
+        requestData.setClientSoftwareVersion(AppInfoParser.getVersion());
+        requestData.setClusterId(cluster.clusterId());
+        requestData.setNodeId(0);
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest(requestData, 
ApiVersionsRequestData.HIGHEST_SUPPORTED_VERSION);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), true, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestMetadataClusterCheckFail() throws 
IOException {
+        ApiVersionsRequestData requestData = new ApiVersionsRequestData();
+        requestData.setClientSoftwareName("apache-kafka-java");
+        requestData.setClientSoftwareVersion(AppInfoParser.getVersion());
+        requestData.setClusterId(cluster.clusterId());
+        requestData.setNodeId(1); // wrong node ID
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest(requestData, 
ApiVersionsRequestData.HIGHEST_SUPPORTED_VERSION);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        assertEquals(Errors.REBOOTSTRAP_REQUIRED.code(), 
apiVersionsResponse.data().errorCode());
+    }
+
+    @ClusterTest(types = {Type.KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT
+    )
+    public void testApiVersionsRequestBeforeSaslHandshakeRequest() throws 
IOException {
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.sendAndReceive(
+                new ApiVersionsRequest.Builder().build((short) 0), socket);
+            validateApiVersionsResponse(
+                apiVersionsResponse,
+                cluster.clientListener(),
+                !"false".equals(

Review Comment:
   ditto



##########
server/src/test/java/org/apache/kafka/server/ApiVersionsRequestTest.java:
##########
@@ -0,0 +1,307 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.server;
+
+import org.apache.kafka.clients.NodeApiVersions;
+import org.apache.kafka.common.message.ApiMessageType;
+import org.apache.kafka.common.message.ApiVersionsRequestData;
+import org.apache.kafka.common.message.ApiVersionsResponseData;
+import org.apache.kafka.common.message.SaslHandshakeRequestData;
+import org.apache.kafka.common.network.ListenerName;
+import org.apache.kafka.common.protocol.ApiKeys;
+import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.requests.ApiVersionsRequest;
+import org.apache.kafka.common.requests.ApiVersionsResponse;
+import org.apache.kafka.common.requests.RequestHeader;
+import org.apache.kafka.common.requests.RequestUtils;
+import org.apache.kafka.common.requests.SaslHandshakeRequest;
+import org.apache.kafka.common.requests.SaslHandshakeResponse;
+import org.apache.kafka.common.security.auth.SecurityProtocol;
+import org.apache.kafka.common.test.ClusterInstance;
+import org.apache.kafka.common.test.api.ClusterConfigProperty;
+import org.apache.kafka.common.test.api.ClusterTest;
+import org.apache.kafka.common.test.api.Type;
+import org.apache.kafka.common.utils.Utils;
+import org.apache.kafka.common.utils.internals.AppInfoParser;
+import org.apache.kafka.server.common.EligibleLeaderReplicasVersion;
+import org.apache.kafka.server.common.GroupVersion;
+import org.apache.kafka.server.common.MetadataVersion;
+import org.apache.kafka.server.common.ShareVersion;
+import org.apache.kafka.server.common.StreamsVersion;
+import org.apache.kafka.server.common.TransactionVersion;
+import org.apache.kafka.test.TestUtils;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class ApiVersionsRequestTest {
+    private final ClusterInstance cluster;
+
+    public ApiVersionsRequestTest(ClusterInstance cluster) {
+        this.cluster = cluster;
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequest() throws IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), false, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"true"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequestIncludesUnreleasedApis() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), true, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testApiVersionsRequestThroughControllerListener() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.controllerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.controllerListenerName(), true, false, 
ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestWithUnsupportedVersion() throws 
IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
sendUnsupportedApiVersionRequest(apiVersionsRequest);
+        assertEquals(Errors.UNSUPPORTED_VERSION.code(), 
apiVersionsResponse.data().errorCode());
+        assertFalse(apiVersionsResponse.data().apiKeys().isEmpty());
+        ApiVersionsResponseData.ApiVersion apiVersion = 
apiVersionsResponse.data().apiKeys().find(ApiKeys.API_VERSIONS.id);
+        assertEquals(ApiKeys.API_VERSIONS.id, apiVersion.apiKey());
+        assertEquals(ApiKeys.API_VERSIONS.oldestVersion(), 
apiVersion.minVersion());
+        assertEquals(ApiKeys.API_VERSIONS.latestVersion(), 
apiVersion.maxVersion());
+    }
+
+    // Use the latest production MV for this test
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, metadataVersion = 
MetadataVersion.IBP_3_8_IV0, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "false"),
+    })
+    public void testApiVersionsRequestValidationV0() throws IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(
+            apiVersionsResponse,
+            cluster.clientListener(),
+            
!"false".equals(cluster.config().serverProperties().get("unstable.api.versions.enable")),
+            false,
+            (short) 0
+        );
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testApiVersionsRequestValidationV0ThroughControllerListener() 
throws IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.controllerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.controllerListenerName(), true, false, (short) 0);
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestValidationV3() throws IOException {
+        // Invalid request because Name and Version are empty by default
+        ApiVersionsRequest apiVersionsRequest = new ApiVersionsRequest(new 
ApiVersionsRequestData(), (short) 3);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        assertEquals(Errors.INVALID_REQUEST.code(), 
apiVersionsResponse.data().errorCode());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestMetadataClusterCheckPass() throws 
IOException {
+        ApiVersionsRequestData requestData = new ApiVersionsRequestData();
+        requestData.setClientSoftwareName("apache-kafka-java");
+        requestData.setClientSoftwareVersion(AppInfoParser.getVersion());
+        requestData.setClusterId(cluster.clusterId());
+        requestData.setNodeId(0);
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest(requestData, 
ApiVersionsRequestData.HIGHEST_SUPPORTED_VERSION);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), true, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestMetadataClusterCheckFail() throws 
IOException {
+        ApiVersionsRequestData requestData = new ApiVersionsRequestData();
+        requestData.setClientSoftwareName("apache-kafka-java");
+        requestData.setClientSoftwareVersion(AppInfoParser.getVersion());
+        requestData.setClusterId(cluster.clusterId());
+        requestData.setNodeId(1); // wrong node ID
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest(requestData, 
ApiVersionsRequestData.HIGHEST_SUPPORTED_VERSION);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        assertEquals(Errors.REBOOTSTRAP_REQUIRED.code(), 
apiVersionsResponse.data().errorCode());
+    }
+
+    @ClusterTest(types = {Type.KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT
+    )
+    public void testApiVersionsRequestBeforeSaslHandshakeRequest() throws 
IOException {
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.sendAndReceive(
+                new ApiVersionsRequest.Builder().build((short) 0), socket);
+            validateApiVersionsResponse(
+                apiVersionsResponse,
+                cluster.clientListener(),
+                !"false".equals(
+                    
cluster.config().serverProperties().get("unstable.api.versions.enable")),
+                false,
+                (short) 0
+            );
+            sendSaslHandshakeRequestValidateResponse(socket);
+        }
+    }
+
+    @ClusterTest(types = {Type.KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT
+    )
+    public void testApiVersionsRequestAfterSaslHandshakeRequest() throws 
IOException {
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            sendSaslHandshakeRequestValidateResponse(socket);
+            ApiVersionsResponse response = IntegrationTestUtils.sendAndReceive(
+                new ApiVersionsRequest.Builder().build((short) 0), socket);
+            assertEquals(Errors.ILLEGAL_SASL_STATE.code(), 
response.data().errorCode());
+        }
+    }
+
+    @ClusterTest(types = {Type.KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT
+    )
+    public void testApiVersionsRequestWithUnsupportedVersionOverSasl() throws 
IOException {
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+            ApiVersionsResponse apiVersionsResponse = 
sendUnsupportedApiVersionRequest(apiVersionsRequest);
+            assertEquals(Errors.UNSUPPORTED_VERSION.code(), 
apiVersionsResponse.data().errorCode());
+            ApiVersionsResponse apiVersionsResponse2 = 
IntegrationTestUtils.sendAndReceive(
+                new ApiVersionsRequest.Builder().build((short) 0), socket);
+            validateApiVersionsResponse(
+                apiVersionsResponse2,
+                cluster.clientListener(),
+                !"false".equals(

Review Comment:
   `cluster.config().serverProperties().get("unstable.api.versions.enable")` is 
not what is eventually used to configure the broker. Maybe we could simply use 
true​ instead?



##########
server/src/test/java/org/apache/kafka/server/ApiVersionsRequestTest.java:
##########
@@ -0,0 +1,307 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.server;
+
+import org.apache.kafka.clients.NodeApiVersions;
+import org.apache.kafka.common.message.ApiMessageType;
+import org.apache.kafka.common.message.ApiVersionsRequestData;
+import org.apache.kafka.common.message.ApiVersionsResponseData;
+import org.apache.kafka.common.message.SaslHandshakeRequestData;
+import org.apache.kafka.common.network.ListenerName;
+import org.apache.kafka.common.protocol.ApiKeys;
+import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.requests.ApiVersionsRequest;
+import org.apache.kafka.common.requests.ApiVersionsResponse;
+import org.apache.kafka.common.requests.RequestHeader;
+import org.apache.kafka.common.requests.RequestUtils;
+import org.apache.kafka.common.requests.SaslHandshakeRequest;
+import org.apache.kafka.common.requests.SaslHandshakeResponse;
+import org.apache.kafka.common.security.auth.SecurityProtocol;
+import org.apache.kafka.common.test.ClusterInstance;
+import org.apache.kafka.common.test.api.ClusterConfigProperty;
+import org.apache.kafka.common.test.api.ClusterTest;
+import org.apache.kafka.common.test.api.Type;
+import org.apache.kafka.common.utils.Utils;
+import org.apache.kafka.common.utils.internals.AppInfoParser;
+import org.apache.kafka.server.common.EligibleLeaderReplicasVersion;
+import org.apache.kafka.server.common.GroupVersion;
+import org.apache.kafka.server.common.MetadataVersion;
+import org.apache.kafka.server.common.ShareVersion;
+import org.apache.kafka.server.common.StreamsVersion;
+import org.apache.kafka.server.common.TransactionVersion;
+import org.apache.kafka.test.TestUtils;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class ApiVersionsRequestTest {
+    private final ClusterInstance cluster;
+
+    public ApiVersionsRequestTest(ClusterInstance cluster) {
+        this.cluster = cluster;
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequest() throws IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), false, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"true"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequestIncludesUnreleasedApis() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), true, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testApiVersionsRequestThroughControllerListener() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.controllerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.controllerListenerName(), true, false, 
ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestWithUnsupportedVersion() throws 
IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
sendUnsupportedApiVersionRequest(apiVersionsRequest);
+        assertEquals(Errors.UNSUPPORTED_VERSION.code(), 
apiVersionsResponse.data().errorCode());
+        assertFalse(apiVersionsResponse.data().apiKeys().isEmpty());
+        ApiVersionsResponseData.ApiVersion apiVersion = 
apiVersionsResponse.data().apiKeys().find(ApiKeys.API_VERSIONS.id);
+        assertEquals(ApiKeys.API_VERSIONS.id, apiVersion.apiKey());
+        assertEquals(ApiKeys.API_VERSIONS.oldestVersion(), 
apiVersion.minVersion());
+        assertEquals(ApiKeys.API_VERSIONS.latestVersion(), 
apiVersion.maxVersion());
+    }
+
+    // Use the latest production MV for this test
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, metadataVersion = 
MetadataVersion.IBP_3_8_IV0, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "false"),
+    })
+    public void testApiVersionsRequestValidationV0() throws IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(
+            apiVersionsResponse,
+            cluster.clientListener(),
+            
!"false".equals(cluster.config().serverProperties().get("unstable.api.versions.enable")),

Review Comment:
   ditto



##########
server/src/test/java/org/apache/kafka/server/ApiVersionsRequestTest.java:
##########
@@ -0,0 +1,307 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.kafka.server;
+
+import org.apache.kafka.clients.NodeApiVersions;
+import org.apache.kafka.common.message.ApiMessageType;
+import org.apache.kafka.common.message.ApiVersionsRequestData;
+import org.apache.kafka.common.message.ApiVersionsResponseData;
+import org.apache.kafka.common.message.SaslHandshakeRequestData;
+import org.apache.kafka.common.network.ListenerName;
+import org.apache.kafka.common.protocol.ApiKeys;
+import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.requests.ApiVersionsRequest;
+import org.apache.kafka.common.requests.ApiVersionsResponse;
+import org.apache.kafka.common.requests.RequestHeader;
+import org.apache.kafka.common.requests.RequestUtils;
+import org.apache.kafka.common.requests.SaslHandshakeRequest;
+import org.apache.kafka.common.requests.SaslHandshakeResponse;
+import org.apache.kafka.common.security.auth.SecurityProtocol;
+import org.apache.kafka.common.test.ClusterInstance;
+import org.apache.kafka.common.test.api.ClusterConfigProperty;
+import org.apache.kafka.common.test.api.ClusterTest;
+import org.apache.kafka.common.test.api.Type;
+import org.apache.kafka.common.utils.Utils;
+import org.apache.kafka.common.utils.internals.AppInfoParser;
+import org.apache.kafka.server.common.EligibleLeaderReplicasVersion;
+import org.apache.kafka.server.common.GroupVersion;
+import org.apache.kafka.server.common.MetadataVersion;
+import org.apache.kafka.server.common.ShareVersion;
+import org.apache.kafka.server.common.StreamsVersion;
+import org.apache.kafka.server.common.TransactionVersion;
+import org.apache.kafka.test.TestUtils;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.util.Collections;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class ApiVersionsRequestTest {
+    private final ClusterInstance cluster;
+
+    public ApiVersionsRequestTest(ClusterInstance cluster) {
+        this.cluster = cluster;
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequest() throws IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), false, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"true"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "true")
+    })
+    public void testApiVersionsRequestIncludesUnreleasedApis() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), true, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testApiVersionsRequestThroughControllerListener() throws 
IOException {
+        ApiVersionsRequest request = new ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(request, 
cluster.controllerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.controllerListenerName(), true, false, 
ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestWithUnsupportedVersion() throws 
IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build();
+        ApiVersionsResponse apiVersionsResponse = 
sendUnsupportedApiVersionRequest(apiVersionsRequest);
+        assertEquals(Errors.UNSUPPORTED_VERSION.code(), 
apiVersionsResponse.data().errorCode());
+        assertFalse(apiVersionsResponse.data().apiKeys().isEmpty());
+        ApiVersionsResponseData.ApiVersion apiVersion = 
apiVersionsResponse.data().apiKeys().find(ApiKeys.API_VERSIONS.id);
+        assertEquals(ApiKeys.API_VERSIONS.id, apiVersion.apiKey());
+        assertEquals(ApiKeys.API_VERSIONS.oldestVersion(), 
apiVersion.minVersion());
+        assertEquals(ApiKeys.API_VERSIONS.latestVersion(), 
apiVersion.maxVersion());
+    }
+
+    // Use the latest production MV for this test
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT}, metadataVersion = 
MetadataVersion.IBP_3_8_IV0, serverProperties = {
+        @ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"false"),
+        @ClusterConfigProperty(key = "unstable.feature.versions.enable", value 
= "false"),
+    })
+    public void testApiVersionsRequestValidationV0() throws IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(
+            apiVersionsResponse,
+            cluster.clientListener(),
+            
!"false".equals(cluster.config().serverProperties().get("unstable.api.versions.enable")),
+            false,
+            (short) 0
+        );
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testApiVersionsRequestValidationV0ThroughControllerListener() 
throws IOException {
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.controllerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.controllerListenerName(), true, false, (short) 0);
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestValidationV3() throws IOException {
+        // Invalid request because Name and Version are empty by default
+        ApiVersionsRequest apiVersionsRequest = new ApiVersionsRequest(new 
ApiVersionsRequestData(), (short) 3);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        assertEquals(Errors.INVALID_REQUEST.code(), 
apiVersionsResponse.data().errorCode());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestMetadataClusterCheckPass() throws 
IOException {
+        ApiVersionsRequestData requestData = new ApiVersionsRequestData();
+        requestData.setClientSoftwareName("apache-kafka-java");
+        requestData.setClientSoftwareVersion(AppInfoParser.getVersion());
+        requestData.setClusterId(cluster.clusterId());
+        requestData.setNodeId(0);
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest(requestData, 
ApiVersionsRequestData.HIGHEST_SUPPORTED_VERSION);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        validateApiVersionsResponse(apiVersionsResponse, 
cluster.clientListener(), true, false, ApiKeys.API_VERSIONS.latestVersion());
+    }
+
+    @ClusterTest(types = {Type.KRAFT, Type.CO_KRAFT})
+    public void testApiVersionsRequestMetadataClusterCheckFail() throws 
IOException {
+        ApiVersionsRequestData requestData = new ApiVersionsRequestData();
+        requestData.setClientSoftwareName("apache-kafka-java");
+        requestData.setClientSoftwareVersion(AppInfoParser.getVersion());
+        requestData.setClusterId(cluster.clusterId());
+        requestData.setNodeId(1); // wrong node ID
+        ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest(requestData, 
ApiVersionsRequestData.HIGHEST_SUPPORTED_VERSION);
+        ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.connectAndReceive(apiVersionsRequest, 
cluster.brokerBoundPorts().get(0));
+        assertEquals(Errors.REBOOTSTRAP_REQUIRED.code(), 
apiVersionsResponse.data().errorCode());
+    }
+
+    @ClusterTest(types = {Type.KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT
+    )
+    public void testApiVersionsRequestBeforeSaslHandshakeRequest() throws 
IOException {
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            ApiVersionsResponse apiVersionsResponse = 
IntegrationTestUtils.sendAndReceive(
+                new ApiVersionsRequest.Builder().build((short) 0), socket);
+            validateApiVersionsResponse(
+                apiVersionsResponse,
+                cluster.clientListener(),
+                !"false".equals(
+                    
cluster.config().serverProperties().get("unstable.api.versions.enable")),
+                false,
+                (short) 0
+            );
+            sendSaslHandshakeRequestValidateResponse(socket);
+        }
+    }
+
+    @ClusterTest(types = {Type.KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT
+    )
+    public void testApiVersionsRequestAfterSaslHandshakeRequest() throws 
IOException {
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            sendSaslHandshakeRequestValidateResponse(socket);
+            ApiVersionsResponse response = IntegrationTestUtils.sendAndReceive(
+                new ApiVersionsRequest.Builder().build((short) 0), socket);
+            assertEquals(Errors.ILLEGAL_SASL_STATE.code(), 
response.data().errorCode());
+        }
+    }
+
+    @ClusterTest(types = {Type.KRAFT},
+        brokerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT,
+        controllerSecurityProtocol = SecurityProtocol.SASL_PLAINTEXT
+    )
+    public void testApiVersionsRequestWithUnsupportedVersionOverSasl() throws 
IOException {
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            ApiVersionsRequest apiVersionsRequest = new 
ApiVersionsRequest.Builder().build((short) 0);
+            ApiVersionsResponse apiVersionsResponse = 
sendUnsupportedApiVersionRequest(apiVersionsRequest);
+            assertEquals(Errors.UNSUPPORTED_VERSION.code(), 
apiVersionsResponse.data().errorCode());
+            ApiVersionsResponse apiVersionsResponse2 = 
IntegrationTestUtils.sendAndReceive(
+                new ApiVersionsRequest.Builder().build((short) 0), socket);
+            validateApiVersionsResponse(
+                apiVersionsResponse2,
+                cluster.clientListener(),
+                !"false".equals(
+                    
cluster.config().serverProperties().get("unstable.api.versions.enable")),
+                false,
+                (short) 0
+            );
+            sendSaslHandshakeRequestValidateResponse(socket);
+        }
+    }
+
+    private void sendSaslHandshakeRequestValidateResponse(Socket socket) 
throws IOException {
+        SaslHandshakeRequest request = new SaslHandshakeRequest(new 
SaslHandshakeRequestData().setMechanism("PLAIN"),
+            ApiKeys.SASL_HANDSHAKE.latestVersion());
+        SaslHandshakeResponse response = 
IntegrationTestUtils.sendAndReceive(request, socket);
+        assertEquals(Errors.NONE, response.error());
+        assertEquals(Collections.singletonList("PLAIN"), 
response.enabledMechanisms());
+    }
+
+    private ApiVersionsResponse 
sendUnsupportedApiVersionRequest(ApiVersionsRequest request) throws IOException 
{
+        RequestHeader overrideHeader = 
IntegrationTestUtils.nextRequestHeader(ApiKeys.API_VERSIONS, Short.MAX_VALUE);
+        try (Socket socket = 
IntegrationTestUtils.connect(cluster.brokerBoundPorts().get(0))) {
+            byte[] serializedBytes = Utils.toArray(
+                    RequestUtils.serialize(overrideHeader.data(), 
overrideHeader.headerVersion(), request.data(), request.version()));
+            IntegrationTestUtils.sendRequest(socket, serializedBytes);
+            return IntegrationTestUtils.receive(socket, ApiKeys.API_VERSIONS, 
(short) 0);
+        }
+    }
+
+    private void validateApiVersionsResponse(ApiVersionsResponse 
apiVersionsResponse,
+                                     ListenerName listenerName,
+                                     boolean enableUnstableLastVersion,
+                                     boolean clientTelemetryEnabled,

Review Comment:
   It appears `clientTelemetryEnabled` is always false



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