In blueprint [1], we approved to allow set weights multiplier on host aggregates to have more flexibility when scheduling. In order to make weigher can get the metadata info, we propose to add a new parameter "host_state" in weight_multiplier method [2], just like what we current do in filter host_passes [3]. That means if you implements the custom weigher, you should change your weigher to accept a host_state. Any thoughts or feedback are welcome, thanks! : ) [1] https://blueprints.launchpad.net/nova/+spec/per-aggregate-scheduling-weight [2] https://review.openstack.org/#/c/628163/12/nova/weights.py@79 [3] https://github.com/openstack/nova/blob/master/nova/scheduler/filters/__init_... Regards, Yikun ---------------------------------------- Jiang Yikun（Kero） Mail: yikunkero@gmail.com