[GCS] Fix the bug about raylet receiving duplicate actor creation tasks (#9422)

Author: raulchen

src/ray/raylet/node_manager.cc

@@ -2300,7 +2300,11 @@ void NodeManager::SubmitTask(const Task &task, const Lineage &uncommitted_lineag
   RAY_LOG(DEBUG) << "Submitting task: " << task.DebugString();
 
   if (local_queues_.HasTask(task_id)) {
-    if (spec.IsActorCreationTask()) {
+    if (RayConfig::instance().gcs_actor_service_enabled() && spec.IsActorCreationTask()) {
+      // NOTE(hchen): Normally when raylet receives a duplicated actor creation task
+      // from GCS, raylet should just ignore the task. However, due to the hack that
+      // we save the RPC reply in task's OnDispatch callback, we have to remove the
+      // old task and re-add the new task, to make sure the RPC reply callback is correct.
       RAY_LOG(WARNING) << "Submitted actor creation task " << task_id
                        << " is already queued. This is most likely due to a GCS restart. "
                           "We will remove "