chia7712 commented on code in PR #23785:
URL: https://github.com/apache/kafka/pull/23785#discussion_r4251304044


##########
core/src/test/scala/unit/kafka/server/KafkaApisTest.scala:
##########
@@ -343,6 +343,36 @@ class KafkaApisTest extends Logging {
     
assertTrue(configNames.contains(TopicConfig.MAX_DECOMPRESSED_MESSAGE_BYTES_CONFIG))
   }
 
+  @Test
+  def testDescribeConfigsTopicIncludesInternalListConfigSetOnTopic(): Unit = {

Review Comment:
   Should we use ClusterInstance to write an integration test that covers the 
whole path? AlterConfigsIntegrationTest in clients-integration-tests already 
does something similar.



##########
server/src/main/java/org/apache/kafka/server/ConfigHelperUtils.java:
##########
@@ -72,12 +72,17 @@ public static 
DescribeConfigsResponseData.DescribeConfigsResult createResponseCo
         // Cast from Map<String, ?> to Map<String, Object> to eliminate 
wildcard types. Cached to avoid multiple calls.
         @SuppressWarnings("unchecked")
         Map<String, Object> nonInternalValues = (Map<String, Object>) 
config.nonInternalValues();
+        Map<String, ?> values = config.values();
         Stream<Entry<String, Object>> allEntries = Stream.concat(
                 config.originals().entrySet().stream()
                         .filter(entry -> entry.getValue() != null
                                 && 
explicitlySetConfigs.contains(entry.getKey())
                                 && 
!nonInternalValues.containsKey(entry.getKey()))
-                        .map(entry -> Map.entry(entry.getKey(), 
entry.getValue())),
+                        // Use the parsed value for internal configs, since 
createConfigEntry expects values of the

Review Comment:
   Sorry for my bad comment. I missed the raw string configs from cluster-wide 
and prefixed configs. I have opened 
https://issues.apache.org/jira/browse/KAFKA-21269 to add tests so we don’t miss 
it in the future.
   
   Would you please revert it :)



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