chia7712 commented on code in PR #17626:
URL: https://github.com/apache/kafka/pull/17626#discussion_r1823805661

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clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java:
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@@ -3490,6 +3490,138 @@ void handleFailure(Throwable throwable) {
         return new DescribeDelegationTokenResult(tokensFuture);
     }
 
+    private static final class ListGroupsResults {
+        private final List<Throwable> errors;
+        private final HashMap<String, GroupListing> listings;
+        private final HashSet<Node> remaining;
+        private final KafkaFutureImpl<Collection<Object>> future;
+
+        ListGroupsResults(Collection<Node> leaders,
+                          KafkaFutureImpl<Collection<Object>> future) {
+            this.errors = new ArrayList<>();
+            this.listings = new HashMap<>();
+            this.remaining = new HashSet<>(leaders);
+            this.future = future;
+            tryComplete();
+        }
+
+        synchronized void addError(Throwable throwable, Node node) {
+            ApiError error = ApiError.fromThrowable(throwable);
+            if (error.message() == null || error.message().isEmpty()) {
+                errors.add(error.error().exception("Error listing groups on " 
+ node));
+            } else {
+                errors.add(error.error().exception("Error listing groups on " 
+ node + ": " + error.message()));
+            }
+        }
+
+        synchronized void addListing(GroupListing listing) {
+            listings.put(listing.groupId(), listing);

Review Comment:
   >  I suppose there is a small possibility that more than one node responds 
for a particular group due to timing effects,
   
   That makes sense. for another, why does `ListGroupsResult` not use `map` 
structure?



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