JimmyWang6 commented on code in PR #18929:
URL: https://github.com/apache/kafka/pull/18929#discussion_r2080201974


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -1172,6 +1203,37 @@ public CompletableFuture<List<DescribedGroup>> 
shareGroupDescribe(
         return FutureUtils.combineFutures(futures, ArrayList::new, 
List::addAll);
     }
 
+    /**
+     * See {@link 
GroupCoordinator#alterShareGroupOffsets(AuthorizableRequestContext, String, 
AlterShareGroupOffsetsRequestData)}.
+     */
+    @Override
+    public CompletableFuture<AlterShareGroupOffsetsResponseData> 
alterShareGroupOffsets(AuthorizableRequestContext context, String groupId, 
AlterShareGroupOffsetsRequestData request) {
+        if (!isActive.get() || metadataImage == null) {
+            return CompletableFuture.completedFuture(
+                
AlterShareGroupOffsetsRequest.getErrorAlterShareGroupResponseData(Errors.COORDINATOR_NOT_AVAILABLE));
+        }
+        
+        if (groupId == null) {
+            return CompletableFuture.completedFuture(
+                
AlterShareGroupOffsetsRequest.getErrorAlterShareGroupResponseData(Errors.GROUP_ID_NOT_FOUND));
+        }
+
+        return runtime.scheduleWriteOperation(
+            "share-group-alter",

Review Comment:
   Right. Good catch.



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