Remove vanilla pickle serialization for task arguments (#6948)

python/ray/includes/ray_config.pxd

@@ -48,10 +48,6 @@ cdef extern from "ray/common/ray_config.h" nogil:
 
         int64_t max_time_for_handler_milliseconds() const
 
-        int64_t size_limit() const
-
-        int64_t num_elements_limit() const
-
         int64_t max_time_for_loop() const
 
         int64_t redis_db_connect_retries()
@@ -86,4 +82,6 @@ cdef extern from "ray/common/ray_config.h" nogil:
 
         uint32_t maximum_gcs_deletion_batch_size() const
 
+        int64_t max_direct_call_object_size() const
+
         void initialize(const unordered_map[c_string, c_string] &config_map)

python/ray/includes/ray_config.pxi

@@ -84,14 +84,6 @@ cdef class Config:
     def max_time_for_handler_milliseconds():
         return RayConfig.instance().max_time_for_handler_milliseconds()
 
-    @staticmethod
-    def size_limit():
-        return RayConfig.instance().size_limit()
-
-    @staticmethod
-    def num_elements_limit():
-        return RayConfig.instance().num_elements_limit()
-
     @staticmethod
     def max_time_for_loop():
         return RayConfig.instance().max_time_for_loop()

python/ray/includes/task.pxi

@@ -95,8 +95,6 @@ cdef class TaskSpec:
                         :self.task_spec.get().ArgMetadataSize(i)]
                     if metadata == RAW_BUFFER_METADATA:
                         obj = data
-                    elif metadata == PICKLE_BUFFER_METADATA:
-                        obj = pickle.loads(data)
                     else:
                         obj = data
                     arg_list.append(obj)