Make reset_cache optionally return None for unimplemented connectors

Signed-off-by: tovam <tovam@pliops.com>

Author: ptovam

vllm/distributed/kv_transfer/kv_connector/v1/base.py

@@ -492,11 +492,11 @@ def build_prom_metrics(
         """
         return None
 
-    def reset_cache(self) -> bool:
+    def reset_cache(self) -> bool | None:
         """
         Reset the connector's internal cache.
 
         Returns:
             bool: True if the cache was successfully reset, False otherwise.
         """
-        return False
+        return None

vllm/distributed/kv_transfer/kv_connector/v1/multi_connector.py

@@ -440,4 +440,4 @@ def build_prom_metrics(
         )
 
     def reset_cache(self) -> bool:
-        return all(connector.reset_cache() for connector in self._connectors)
+        return all(c.reset_cache() is not False for c in self._connectors)

vllm/v1/core/sched/scheduler.py

@@ -1250,7 +1250,7 @@ def reset_connector_cache(self) -> bool:
         if self.connector is None:
             logger.warning("reset_connector called but no KV connector configured.")
             return False
-        return self.connector.reset_cache()
+        return self.connector.reset_cache() is not False
 
     def make_stats(
         self,