skaundinya15 commented on a change in pull request #10962:
URL: https://github.com/apache/kafka/pull/10962#discussion_r664703667



##########
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());

Review comment:
       Not sure I follow - are you saying that if there is a group that is 
included multiple times in the request the `stream()` here would throw an 
`IllegalStateException`? Are you saying we should put a `try...catch` statement 
here to catch any `IllegalStateException`? 




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