rajinisivaram commented on a change in pull request #10962:
URL: https://github.com/apache/kafka/pull/10962#discussion_r664806203



##########
File path: 
clients/src/main/java/org/apache/kafka/common/requests/OffsetFetchRequest.java
##########
@@ -174,6 +315,28 @@ public boolean isAllPartitions() {
         return data.topics() == ALL_TOPIC_PARTITIONS;
     }
 
+    public boolean isAllPartitionsForGroup(String groupId) {
+        OffsetFetchRequestGroup group = data
+            .groupIds()
+            .stream()
+            .filter(g -> g.groupId().equals(groupId))
+            .collect(toSingleton());
+        return group.topics() == ALL_TOPIC_PARTITIONS_BATCH;
+    }
+
+    // Custom collector to filter a single element
+    private <T> Collector<T, ?, T> toSingleton() {

Review comment:
       Same test class `OffsetFetchRequestTest.scala`, a test with v8 with a 
batched request where the same group appears twice, perhaps with different 
topics. The response should be either InvalidRequestException because we want 
to treat it as an error OR actual offsets because we handle the request 
correctly.




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