Allow --lru-evict to be passed into ray start (#8959)

python/ray/parameter.py

@@ -89,6 +89,7 @@ class RayParams:
         load_code_from_local: Whether load code from local file or from GCS.
         _internal_config (str): JSON configuration for overriding
             RayConfig defaults. For testing purposes ONLY.
+        lru_evict (bool): Enable LRU eviction if space is needed.
     """
 
     def __init__(self,
@@ -130,7 +131,8 @@ class RayParams:
                  include_java=False,
                  java_worker_options=None,
                  load_code_from_local=False,
-                 _internal_config=None):
+                 _internal_config=None,
+                 lru_evict=False):
         self.object_ref_seed = object_ref_seed
         self.redis_address = redis_address
         self.num_cpus = num_cpus
@@ -168,8 +170,21 @@ class RayParams:
         self.java_worker_options = java_worker_options
         self.load_code_from_local = load_code_from_local
         self._internal_config = _internal_config
+        self._lru_evict = lru_evict
         self._check_usage()
 
+        # Set the internal config options for LRU eviction.
+        if lru_evict:
+            # Turn off object pinning.
+            if self._internal_config is None:
+                self._internal_config = dict()
+            if self._internal_config.get("object_pinning_enabled", False):
+                raise Exception(
+                    "Object pinning cannot be enabled if using LRU eviction.")
+            self._internal_config["object_pinning_enabled"] = False
+            self._internal_config["object_store_full_max_retries"] = -1
+            self._internal_config["free_objects_period_milliseconds"] = 1000
+
     def update(self, **kwargs):
         """Update the settings according to the keyword arguments.