dajac commented on code in PR #18848:
URL: https://github.com/apache/kafka/pull/18848#discussion_r1954516380


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -822,21 +834,60 @@ public 
CompletableFuture<DeleteGroupsResponseData.DeletableGroupResultCollection
         });
 
         groupsByTopicPartition.forEach((topicPartition, groupList) -> {
-            
CompletableFuture<DeleteGroupsResponseData.DeletableGroupResultCollection> 
future =
-                runtime.scheduleWriteOperation(
-                    "delete-groups",
-                    topicPartition,
-                    Duration.ofMillis(config.offsetCommitTimeoutMs()),
-                    coordinator -> coordinator.deleteGroups(context, groupList)
-                ).exceptionally(exception -> handleOperationException(
-                    "delete-groups",
-                    groupList,
-                    exception,
-                    (error, __) -> 
DeleteGroupsRequest.getErrorResultCollection(groupList, error),
-                    log
-                ));
-
-            futures.add(future);
+            
CompletableFuture<DeleteGroupsResponseData.DeletableGroupResultCollection> 
shareFuture = deleteShareGroups(topicPartition, groupList)

Review Comment:
   This is possible but it would require to make the persister work with the 
event based workflows. Basically, we can not wait on the future from the shard 
and there is no way at the moment to react to it neither. We could make it work 
by wrapping the persister into a class which understand how to interface with 
the runtime/shard but it is more complicated than doing it in the service layer.



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