CalvinConfluent commented on code in PR #15470:
URL: https://github.com/apache/kafka/pull/15470#discussion_r1523971792


##########
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java:
##########
@@ -2184,9 +2178,139 @@ void handleFailure(Throwable throwable) {
                 completeAllExceptionally(topicFutures.values(), throwable);
             }
         };
-        if (!topicNamesList.isEmpty()) {
-            runnable.call(call, now);
+        return call;
+    }
+
+    @SuppressWarnings({"MethodLength", "NPathComplexity"})
+    private Map<String, KafkaFuture<TopicDescription>> 
handleDescribeTopicsByNamesWithDescribeTopicPartitionsApi(
+        final Collection<String> topicNames,
+        DescribeTopicsOptions options
+    ) {
+        final Map<String, KafkaFutureImpl<TopicDescription>> topicFutures = 
new HashMap<>(topicNames.size());
+        final ArrayList<String> topicNamesList = new ArrayList<>();
+        for (String topicName : topicNames) {
+            if (topicNameIsUnrepresentable(topicName)) {
+                KafkaFutureImpl<TopicDescription> future = new 
KafkaFutureImpl<>();
+                future.completeExceptionally(new InvalidTopicException("The 
given topic name '" +
+                    topicName + "' cannot be represented in a request."));
+                topicFutures.put(topicName, future);
+            } else if (!topicFutures.containsKey(topicName)) {
+                topicFutures.put(topicName, new KafkaFutureImpl<>());
+                topicNamesList.add(topicName);
+            }
         }
+
+        if (topicNamesList.isEmpty()) {
+            return new HashMap<>(topicFutures);
+        }
+
+        // First, we need to retrieve the node info.
+        DescribeClusterResult clusterResult = describeCluster();
+        Map<Integer, Node> nodes;
+        try {
+            nodes = 
clusterResult.nodes().get().stream().collect(Collectors.toMap(Node::id, node -> 
node));
+        } catch (InterruptedException | ExecutionException e) {
+            completeAllExceptionally(topicFutures.values(), e.getCause());
+            return new HashMap<>(topicFutures);
+        }
+
+        final long now = time.milliseconds();
+        Call call = new Call("describeTopicPartitions", calcDeadlineMs(now, 
options.timeoutMs()),
+            new LeastLoadedNodeProvider()) {
+            Map<String, TopicRequest> pendingTopics =
+                topicNamesList.stream().map(topicName -> new 
TopicRequest().setName(topicName))
+                    .collect(Collectors.toMap(topicRequest -> 
topicRequest.name(), topicRequest -> topicRequest, (t1, t2) -> t1, 
TreeMap::new));
+
+            TopicDescription partiallyFinishedTopicDescription = null;
+            TopicDescription nextTopicDescription = null;
+
+            @Override
+            DescribeTopicPartitionsRequest.Builder createRequest(int 
timeoutMs) {
+                DescribeTopicPartitionsRequestData request = new 
DescribeTopicPartitionsRequestData()
+                    .setTopics(new ArrayList<>(pendingTopics.values()))
+                    
.setResponsePartitionLimit(options.partitionSizeLimitPerResponse());
+                if (partiallyFinishedTopicDescription != null) {

Review Comment:
   Correct, updated the comments.



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