[Core] Fix a detached actor bug fix when GCS actor management is off. (#8843)

python/ray/tests/test_actor_advanced.py

@@ -712,6 +712,8 @@ def test_detached_actor_cleanup(ray_start_regular):
         detached_actor = DetachedActor.options(name=actor_name).remote()
         # Wait for detached actor creation.
         assert ray.get(detached_actor.ping.remote()) == "pong"
+        del detached_actor
+        detached_actor = ray.get_actor(dup_actor_name)
         ray.kill(detached_actor)
         # Wait until actor dies.
         actor_status = ray.actors(actor_id=detached_actor._actor_id.hex())

python/ray/util/named_actors.py

@@ -77,7 +77,7 @@ def _register_actor(name, actor_handle):
         raise ValueError("An actor with name={} already exists".format(name))
 
     # Add the actor to Redis if it does not already exist.
-    _internal_kv_put(actor_name, pickle.dumps(actor_handle))
+    _internal_kv_put(actor_name, pickle.dumps(actor_handle), overwrite=True)
 
 
 def register_actor(name, actor_handle):