TaiJuWu commented on code in PR #19650:
URL: https://github.com/apache/kafka/pull/19650#discussion_r2080977162


##########
clients/clients-integration-tests/src/test/java/org/apache/kafka/clients/admin/StaticBrokerConfigTest.java:
##########
@@ -108,4 +119,80 @@ public void 
testTopicConfigsGetImpactedIfStaticConfigsAddToBroker(ClusterInstanc
                 "Config value should not be custom value since controller 
doesn't have related static config");
         }
     }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void 
testInternalConfigsDoNotReturnForDescribeConfigs(ClusterInstance cluster) 
throws Exception {
+        try (
+                Admin admin = cluster.admin();
+                Admin controllerAdmin = cluster.admin(Map.of(), true)
+        ) {
+            ConfigResource brokerResource = new 
ConfigResource(ConfigResource.Type.BROKER, "0");
+            ConfigResource topicResource = new 
ConfigResource(ConfigResource.Type.TOPIC, TOPIC);
+            ConfigResource groupResource = new 
ConfigResource(ConfigResource.Type.GROUP, "testGroup");
+            ConfigResource clientMetricsResource = new 
ConfigResource(ConfigResource.Type.CLIENT_METRICS, "testClient");
+
+            admin.createTopics(List.of(new NewTopic(TOPIC, 1, (short) 
1))).config(TOPIC).get();
+            // make sure the topic metadata exist
+            cluster.waitForTopic(TOPIC, 1);
+            Map<ConfigResource, Config> configResourceMap = 
admin.describeConfigs(
+                    List.of(brokerResource, topicResource, groupResource, 
clientMetricsResource)).all().get();
+
+            // test for case ConfigResource.Type == BROKER
+            // Notice: since the testing framework actively sets three 
internal configurations when starting the
+            // broker (see 
org.apache.kafka.common.test.KafkaClusterTestKit.Builder.createNodeConfig()),
+            // so the API `describeConfigs` will also return these three 
configurations. However, other internal
+            // configurations will not be returned
+            Set<String> ignoreConfigNames = Set.of(
+                    ServerConfigs.UNSTABLE_FEATURE_VERSIONS_ENABLE_CONFIG,
+                    ServerConfigs.UNSTABLE_API_VERSIONS_ENABLE_CONFIG,
+                    KRaftConfigs.SERVER_MAX_STARTUP_TIME_MS_CONFIG);
+            Config brokerConfig = configResourceMap.get(brokerResource);
+            assertNotContainsInternalConfig(brokerConfig, 
KafkaConfig.configDef().configKeys(), ignoreConfigNames);
+
+            // test for case ConfigResource.Type == TOPIC
+            Config topicConfig = configResourceMap.get(topicResource);
+            assertNotContainsInternalConfig(topicConfig, 
LogConfig.configKeys());
+
+            // test for case ConfigResource.Type == GROUP
+            Config groupConfig = configResourceMap.get(groupResource);
+            assertNotContainsInternalConfig(groupConfig, 
GroupConfig.configDef().configKeys());
+
+            // test for case ConfigResource.Type == CLIENT_METRICS
+            Config clientMetricsConfig = 
configResourceMap.get(clientMetricsResource);
+            assertNotContainsInternalConfig(clientMetricsConfig, 
ClientMetricsConfigs.configDef().configKeys());
+
+            // test for controller node, and ConfigResource.Type == BROKER
+            ConfigResource controllerResource = new 
ConfigResource(ConfigResource.Type.BROKER, "3000");
+            Map<ConfigResource, Config> controllerConfigMap = 
controllerAdmin.describeConfigs(List.of(controllerResource)).all().get();
+            Config controllerConfig = 
controllerConfigMap.get(controllerResource);
+            assertNotContainsInternalConfig(controllerConfig, 
KafkaConfig.configDef().configKeys(), ignoreConfigNames);
+        }
+    }
+
+    @ClusterTest(types = {Type.KRAFT})
+    public void testInternalConfigsDoNotReturnForCreateTopics(ClusterInstance 
cluster) throws Exception {
+        try (Admin admin = cluster.admin()) {
+            // test for createTopics API
+            Config config = admin.createTopics(List.of(new NewTopic(TOPIC, 1, 
(short) 1))).config(TOPIC).get();
+            assertNotContainsInternalConfig(config, LogConfig.configKeys());
+        }
+    }
+
+    private void assertNotContainsInternalConfig(Config config, Map<String, 
ConfigDef.ConfigKey> configKeyMap) {

Review Comment:
   How about `assertNotContainsAnyInternalConfig `?



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