根据不同场景，更新默认调度和分离调度的选择

vllm/v1/core/sched/scheduler.py

@@ -1084,10 +1084,15 @@ class Scheduler(SchedulerInterface):
         return scheduler_output
     
     def schedule(self) -> SchedulerOutput:
-        if (self.full_cuda_graph and self.use_mla and self.num_spec_tokens > 0) or envs.VLLM_USE_PD_SPLIT:
+        if envs.VLLM_USE_PD_SPLIT: 
             return self.schedule_split_pd()
         else:
-            return self.schedule_default()
+            if self.connector is not None:
+                return self.schedule_default()
+            if self.full_cuda_graph and self.use_mla and self.num_spec_tokens > 0 :
+                return self.schedule_split_pd()
+            else:
+                return self.schedule_default()
 
     def _update_after_schedule(
         self,