DL1231 commented on code in PR #19808:
URL: https://github.com/apache/kafka/pull/19808#discussion_r2106900047


##########
clients/src/test/java/org/apache/kafka/clients/admin/AdminClientTestUtils.java:
##########
@@ -163,6 +164,15 @@ public static ListConsumerGroupOffsetsResult 
listConsumerGroupOffsetsResult(Stri
         return new 
ListConsumerGroupOffsetsResult(Collections.singletonMap(CoordinatorKey.byGroupId(group),
 future));
     }
 
+    public static ListConfigResourcesResult 
listConfigResourcesResult(Map<ConfigResource.Type, Set<String>> resourceNames) {
+        Collection<ConfigResource> resources = 
resourceNames.entrySet().stream()
+            .flatMap(entry -> entry.getValue().stream()
+                .map(name -> new ConfigResource(entry.getKey(), name)))
+            .collect(Collectors.toList());
+        return new 
ListConfigResourcesResult(KafkaFuture.completedFuture(resources));
+

Review Comment:
   nit: extra blank



##########
core/src/main/scala/kafka/admin/ConfigCommand.scala:
##########
@@ -342,6 +342,42 @@ object ConfigCommand extends Logging {
   }
 
   private def describeResourceConfig(adminClient: Admin, entityType: String, 
entityName: Option[String], describeAll: Boolean): Unit = {
+    if (!describeAll) {
+      entityName.foreach { name =>
+        entityType match {
+          case TopicType =>
+            Topic.validate(name)
+            if (!adminClient.listTopics(new 
ListTopicsOptions().listInternal(true)).names.get.contains(name)) {
+              System.out.println(s"The $entityType '$name' doesn't exist and 
doesn't have dynamic config.")
+              return
+            }
+          case BrokerType | BrokerLoggerConfigType =>
+            if 
(adminClient.describeCluster.nodes.get.stream.anyMatch(_.idString == name)) {
+              // valid broker id
+            } else if (name == BrokerDefaultEntityName) {
+              // default broker configs
+            } else {
+              System.out.println(s"The $entityType '$name' doesn't exist and 
doesn't have dynamic config.")
+              return
+            }
+          case ClientMetricsType =>
+            if 
(adminClient.listConfigResources(java.util.Set.of(ConfigResource.Type.CLIENT_METRICS),
 new ListConfigResourcesOptions).all.get

Review Comment:
   nit: Can't this just be util.Set.of?



##########
core/src/main/scala/kafka/admin/ConfigCommand.scala:
##########
@@ -342,6 +342,42 @@ object ConfigCommand extends Logging {
   }
 
   private def describeResourceConfig(adminClient: Admin, entityType: String, 
entityName: Option[String], describeAll: Boolean): Unit = {
+    if (!describeAll) {
+      entityName.foreach { name =>
+        entityType match {
+          case TopicType =>
+            Topic.validate(name)
+            if (!adminClient.listTopics(new 
ListTopicsOptions().listInternal(true)).names.get.contains(name)) {
+              System.out.println(s"The $entityType '$name' doesn't exist and 
doesn't have dynamic config.")
+              return
+            }
+          case BrokerType | BrokerLoggerConfigType =>
+            if 
(adminClient.describeCluster.nodes.get.stream.anyMatch(_.idString == name)) {
+              // valid broker id
+            } else if (name == BrokerDefaultEntityName) {
+              // default broker configs
+            } else {
+              System.out.println(s"The $entityType '$name' doesn't exist and 
doesn't have dynamic config.")
+              return
+            }
+          case ClientMetricsType =>
+            if 
(adminClient.listConfigResources(java.util.Set.of(ConfigResource.Type.CLIENT_METRICS),
 new ListConfigResourcesOptions).all.get
+              .stream.noneMatch(_.name == name)) {
+              System.out.println(s"The $entityType '$name' doesn't exist and 
doesn't have dynamic config.")
+              return
+            }
+          case GroupType =>
+            if (adminClient.listGroups().all.get.stream.noneMatch(_.groupId() 
== name) &&
+              
adminClient.listConfigResources(java.util.Set.of(ConfigResource.Type.GROUP), 
new ListConfigResourcesOptions).all.get

Review Comment:
   ditto



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