squah-confluent commented on code in PR #23888:
URL: https://github.com/apache/kafka/pull/23888#discussion_r4335929334


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/share/ShareGroup.java:
##########
@@ -97,6 +99,33 @@ public record InitMapValue(
         Set<Integer> partitions,
         long timestamp
     ) {
+        public InitMapValue {
+            partitions = Set.copyOf(partitions);
+        }
+
+        public InitMapValue(String name, Collection<Integer> partitions, long 
timestamp) {
+            this(name, Set.copyOf(partitions), timestamp);
+        }
+
+        /**
+         * @param added The partitions to add.
+         * @return A copy of this value with the partitions added.
+         */
+        public InitMapValue withAddedPartitions(Collection<Integer> added) {
+            Set<Integer> newPartitions = new HashSet<>(partitions);
+            newPartitions.addAll(added);
+            return new InitMapValue(name, newPartitions, timestamp);

Review Comment:
   Do you mean replacing `Set.copyOf` with `Collections.unmodifiableSet` in the 
constructor or passing an `unmodifiableSet` wrapper in to the existing 
constructor?



##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/share/ShareGroup.java:
##########


Review Comment:
   Yes, we can do that too



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