dajac commented on a change in pull request #11019:
URL: https://github.com/apache/kafka/pull/11019#discussion_r668799671



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/admin/internals/DeleteConsumerGroupOffsetsHandler.java
##########
@@ -100,51 +100,115 @@ public String apiName() {
         final OffsetDeleteResponse response = (OffsetDeleteResponse) 
abstractResponse;
         Map<CoordinatorKey, Map<TopicPartition, Errors>> completed = new 
HashMap<>();
         Map<CoordinatorKey, Throwable> failed = new HashMap<>();
-        List<CoordinatorKey> unmapped = new ArrayList<>();
+        final Set<CoordinatorKey> groupsToUnmap = new HashSet<>();
+        final Set<CoordinatorKey> groupsToRetry = new HashSet<>();
 
         final Errors error = Errors.forCode(response.data().errorCode());
         if (error != Errors.NONE) {
-            handleError(groupId, error, failed, unmapped);
+            handleGroupError(groupId, error, failed, groupsToUnmap, 
groupsToRetry);
         } else {
-            final Map<TopicPartition, Errors> partitions = new HashMap<>();
-            response.data().topics().forEach(topic -> 
-                topic.partitions().forEach(partition -> {
-                    Errors partitionError = 
Errors.forCode(partition.errorCode());
-                    if (!handleError(groupId, partitionError, failed, 
unmapped)) {
-                        partitions.put(new TopicPartition(topic.name(), 
partition.partitionIndex()), partitionError);
+            final Map<TopicPartition, Errors> partitionResults = new 
HashMap<>();
+            response.data().topics().forEach(topic ->
+                topic.partitions().forEach(partitionoffsetDeleteResponse -> {
+                    Errors partitionError = 
Errors.forCode(partitionoffsetDeleteResponse.errorCode());
+                    TopicPartition topicPartition = new 
TopicPartition(topic.name(), partitionoffsetDeleteResponse.partitionIndex());
+                    if (partitionError != Errors.NONE) {
+                        handlePartitionError(groupId, partitionError, 
topicPartition, groupsToUnmap, groupsToRetry);

Review comment:
       I see. I think that it used to work because 
`ConsumerGroupOperationContext.hasCoordinatorMoved` relied on 
`response.errorCount()`. I think that the unit test is incorrect in this case.




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