[Object Spilling] Remove LRU eviction (#13977)

* done.

* formatting.

* done.

* done.

python/ray/tests/test_actor_failures.py

@@ -32,10 +32,9 @@ def ray_init_with_task_retry_delay():
 @pytest.mark.parametrize(
     "ray_start_regular", [{
         "object_store_memory": 150 * 1024 * 1024,
-        "_lru_evict": True,
     }],
     indirect=True)
-def test_actor_eviction(ray_start_regular):
+def test_actor_spilled(ray_start_regular):
     object_store_memory = 150 * 1024 * 1024
 
     @ray.remote
@@ -58,19 +57,14 @@ def test_actor_eviction(ray_start_regular):
         ray.get(obj)
 
     # Get each object again. At this point, the earlier objects should have
-    # been evicted.
-    num_evicted, num_success = 0, 0
+    # been spilled.
+    num_success = 0
     for obj in objects:
-        try:
-            val = ray.get(obj)
-            assert isinstance(val, np.ndarray), val
-            num_success += 1
-        except ray.exceptions.ObjectLostError:
-            num_evicted += 1
-    # Some objects should have been evicted, and some should still be in the
-    # object store.
-    assert num_evicted > 0
-    assert num_success > 0
+        val = ray.get(obj)
+        assert isinstance(val, np.ndarray), val
+        num_success += 1
+    # All of objects should've been spilled, so all of them should succeed.
+    assert num_success == len(objects)
 
 
 @pytest.mark.skipif(sys.platform == "win32", reason="Very flaky on Windows.")